What possible conclusions can be drawn from the observations that in male Drosophila, no crossing over occurs, and that during meiosis, synaptonemal complexes are not seen in males but are observed in females where crossing over occurs?

What possible conclusions can be drawn from the observations that in male Drosophila, no crossing over occurs, and that during meiosis, synaptonemal complexes are not seen in males but are observed in females where crossing over occurs?

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter20: Chromosomes And Human Genetics

Section: Chapter Questions

Problem 2CT: Human sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how...

See similar textbooks

Related questions

Q: In Drosophila, a fully heterozygous female with the X-linked recessive genes a, b, and c (not…

A: A fully heterozygous female with x linked gene a, b, c was mated with male a, b, c. Parental cross -…

Q: In Drosophila, a heterozygous female for the X-linkedrecessive traits a, b, and c was crossed to a…

A: Genetics is a branch of biology that deals with genes, heredity, and variation. Heredity purely…

Q: How many gametes of differing genotypes can a female drosophila of genotype ABC/abc produce? How…

A: There will be same gametes will be developed in males and females. The explanation is given bellow.

Q: Explain the causes of familial Down syndrome. How does it differ from Down syndrome due to…

A: Down syndrome is a disorder in which individuals have an extra copy of chromosome 21 instead of two…

Q: . A white-eyed female Drosophila is mated with a redeyed (wild-type) male, the reciprocal cross of…

A: Dominant and recessive traits exist when a trait has two different forms at the gene level. The…

Q: What is the probability that, in an organism with a haploid number of 10, a sperm will be formed…

A: Meiosis is a type of cell division where four gametes or daughter cells are produced as a result of…

Q: Why is the gene for eye color in drosophila present on the X chromosome ?

A: Gene is the basic unit of heredity for all life forms. It is transferable from one generation to its…

Q: Miniature wings (Xm) in Drosophila result from an X-linked allele that is recessive to the allele…

A: Alleles are the alternative forms of a gene. Allele can be dominant or recessive.

Q: In humans, one of the genes determining color vision islocated on the X chromosome. The dominant…

A: Sex-linked disorders generally have genes associated with the X chromosome. It is studied under the…

Q: Two phenotypically normal parents produce a phenotypicallyabnormal child in which chromosome 5 is…

A: The thread-like structure present inside the nucleus is called a chromosome. The chromosome is…

Q: A Drosophila male is heterozygous for a reciprocaltranslocation between an autosome and the Y…

A: Chromosomal translocation is the abnormal condition of chromosomes with unusual rearrangement. It…

Q: Which sex chromosome (X or Y) carries the gene for eye color in Drosophila?

A: The mode of inheritance is a pattern of obtaining parentral alleles or genes to the offsprings. The…

Q: White eye color is a recessive sex-linked trait in fruit flies. If a whiteeyed Drosophila female is…

A: Genes are the hereditary unit of an organism. The DNA (deoxyribonucleic acid) forms the genes. DNA…

Q: Female flies with white eyes and miniature wings (both X-linkedrecessive traits) were crossed to…

A: Chromosomal composition of these rare females will be – XXY. Both the X chromosomes must be coming…

Q: . Researchers discovered recently that the sole functionof the SRY protein is to activate an…

A: There are various genetic disorders that develop due to anomalies in sex chromosomes. They normally…

Q: In mice, the Sry gene is located on the Y chromosome very close to one of the pseudoautosomal…

A: The chromosomes are the genetic material present in the nucleus of the cell which is a condensed…

Q: In certain salamanders, the sex of a genetic female can be altered, changing her into a functional…

A: Salamanders are vertebrates and they belong to class amphibia. Salamanders can survive on both lands…

Q: Using breeding techniques, Andrei Dyban and V. S. Baranov (Cytogenetics of Mammalian Embryonic…

A: Trisomy is the condition of the presence of three copies of one or more chromosomes in the genome.…

Q: In Drosophila subobscura, the presence of a recessive gene called grandchildless (gs) causes the…

A: The grandchildless is an autosomal recessive condition (gs/gs). The males of the Drosophila…

Q: Describe the cytological observation that suggests that crossing over occurs during the first…

A: The reductional cell division is the meiosis. It happens in two major stages- meiosis I and meiosis…

Q: What specific observations (evidence) support the conclusions about sex determination in Drosophila…

A: BASIC INFORMATION SEX DETERMINATION It is basically the establishment of the gender of an…

Q: . A woman with Turner syndrome is found to be colorblind (an X-linked recessive phenotype). Both her…

A: Turner syndrome is a chromosomal disorder that impairs women's development. Half of the sex…

Q: The inheritance in short wings in Drosophila fruit flies is an x-linked trait, recessive. Which…

A: X-linked recessive inheritance is caused when a mutation occurs in the X-chromosome therefore a male…

Q: Which sex chromosome (X or Y) carries the gene for eye color in Drosophila? Why?

A: Red eye colour is dominant over white eye colour in drosophila.

Q: Crossing-over does not occur between any pair of homologous chromosomes during meiosis in male…

A: During meiosis, crossing over allows recombination of genes between homologous chromosomes. Based on…

Q: The following question refers to Drosophila that are heterozygous for three different genes A, B,…

A: It seems that the first question that you have posted is opinion based and as per the honor code we…

Q: In humans, the development of gonadal sex in females is determined by a. The production of inductors…

A: Gonadotropin-releasing hormone (GnRH) stimulates FSH and LH generation in both males and females.…

Q: A female Drosophila with the mutant phenotype 'notched wings' was mated to a wild type male.…

A: Drosophila melanogaster is a fly species that belong to order Diptera. This is also known as fruit…

Q: : In Drosophila, yellow body is due to an X-linked gene that is recessive to the gene for gray body.…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: Miniature wings in Drosophila result from an X-linked allele (w) that is recessive to the allele for…

A: The allele for miniature wings is represented with w And the allele for long wings with + The allele…

Q: Researchers discovered recently that the sole functionof the SRY protein is to activate an autosomal…

A: Sex-determining region of Y (SRY) is responsible for maleness in males. Mutation in the SRY region…

Q: Two different strains of Drosophila melanogaster are mated in reciprocal crosses. When strain A…

A: Transposable elements are DNA sequences that are able to change their position in a genome sequence.…

Q: Vermillion eye color in Drosophila sp. is a sex-linked recessive trait. What phenotype would be…

A: Considering XvXV as Vermilion eye coloured female the crossing is given as follows. The phenotype…

Q: Fruit flies (Drosophila) normally have bright red eyes. However, the red color that you see is…

A: Let the alleles of the color be : Orange : AA. Enzyme 1- bb Brown : aa.…

Q: Some individuals grow ear hair later in life, the gene for this trait is beleived to be carried on…

A: The phenotypic expression is the ultimate product of a gene. All of our phenotypic characteristics…

Q: How does sex determination in Drosophila differ from sex determination in humans?

A: Sex determination is a method for determining the sexual characteristics within an organism. These…

Q: How do we know that Drosophila utilizes a different sexdetermination mechanism than mammals, even…

A: A chromosome is a compact form of DNA molecule present in dividing cells. In metabolically active…

Q: What is the difference between sex determination in mammals and in Drosophila?

A: Sex determination is the process of identification of different sex that is male and female, in…

Q: Describe the major difference between sex determination in Drosophila and in humans.

A: Drosophila melanogaster refers to the fruit fly which is widely used in genetic research as it has…

Q: Vermilion eye color in Drosophila is sex-linked and recessive. What would be the phenotypes of male…

A: Vermilion eye color in Drosophila is a sex-linked and recessive characteristic. This sex-linked…

Q: In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormal phenotype…

Q: In elegans, lon-2 and unc-2 are recessive mutations that are 8 map units apart on the X chromosome.…

A: A map unit is defined as the distance between two linked gene pairs where 1% of the products of…

Q: A new recessive mutant allele doesn’t show pseudodominance with any of the deletions that span…

A: Pseudodominance is defined as the sudden appearance of the phenotype of a recessive gene in a…

Q: Explain how polytene chromosomes of Drosophila are produced and how they form a six-armed structure?

A: Polytene chromosomes are large chromosomes that have thousands of DNA strands. They provide a high…

Q: Why does the sex chromosome X carry the gene for eye color in Drosophila?

A: The mode of inheritance is a pattern of obtaining parentral alleles or genes to the offsprings. The…

Question

What possible conclusions can be drawn from the observations
that in male Drosophila, no crossing over occurs, and that during
meiosis, synaptonemal complexes are not seen in males but are
observed in females where crossing over occurs?

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.

Similar questions

Though an individual with abberations such as Robertsonian translocation may be phenotypically normal, they can generate gametes through meiosis that have atypical organizations of chromosomes, resulting in recurrent fetal abnormalities or miscarriages. Why, despite these Robertsonian translocations, are affected cells still able to generate typical gametes through meiosis?
A male Drosophila melanogaster has the genotype A/a; B/b; C/c; XD/Y (all genes are on separate chromosomes). How many different sperm genotypes can it produce through meiosis of one single pre-gametic (2n) cell? (remember, there is no crossing over in male Drosophila) Explain.
Female flies with white eyes and miniature wings (both X-linkedrecessive traits) were crossed to male flies with red eyes and longwings. On rare occasions, female offspring were produced withwhite eyes. If we assume these females are due to errors in meiosis, what would be the most likely chromosomal composition ofsuch flies? What would be their wing length?
How many gametes of differing genotypes can a female drosophila of genotype ABC/abc produce? How many gametes of differing genotypes can a male drosophila of genotype ABC/abc produce?
Because of non-disjunction in some stocks of Drosophila. melanogaster, about 1 in 65,000 egg cells have two copies of the X chromosome and about 1 in 375 egg cells have no X chromosome. Assuming that meiosis in males is ‘always normal', what is the expected frequency of XXX females and XO males arising from any number of fertilized eggs? Do not be concerned as to whether it is lethal or not.
Vermillion eye color in Drosophila sp. is a sex-linked recessive trait. What phenotype would be found in this progeny of a cross between a vermillion female and a wild type male?
Vermillion eye color in Drosophila is a sex-linked recessive trait. What phenotype would be found in this progeny of a cross between a vermillion female and a wild type male?
In Drosophila, ebony body colour is produced by a recessive gene a and wild-type (gray) body colour by its dominant allele a+. Vestigial wings are governed by a recessive gene vg, and normal wing size (wild type) by its dominant allele vg+. If wild-type dihybrid flies are crossed and produce 256 progeny, how many of these progeny flies are expected in each phenotypic class?
In fruit flies, chromosomal crossing over does not occur in meiosis in males, whereas crossing over does occur in meiosis in females. In fruit flies that are heterozygous at many genes (i.e. many maternal and paternal versions of the genes differ), at what stage would cells no longer be heterozygous for any gene during the process of meiosis? a)After the second meiotic division in males, and after the first meiotic division in females. b)After the second meiotic division in both males and females. c)After the first meiotic division in both males and females. d)After the first meiotic division in males, and after the second meiotic division in females.
In Drosophila,, the curled mutation (cu, chromosome 3, position 50.0) results in wings that curl up, while ebony (e, chromosome 3, position 70.7) results in a dark body. True breeding, wild type females are mated with true breeding males with curled wings and ebony bodies. Considering Drosophila notation, which of the following correctly diagrams the P1 cross? X X ++ e + + + O+ X + X + ■ + X + + + 3+ X X X X + + Y Y cu cu cu + cu cu J e e e e e (D e + cu cu (D
A reciprocal translocation between chromosome 1 and 2 in Drosophila resulted in AB//CPQR and MN//ODEF. Double stroke indicates centromere location. (i) Diagram the alignment of these chromosomes during meiosis. (ii) What will be the gametes produced by alternate segregation, adjacent 1 segregation and adjacent 2 segregation?
Human sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele? c. If a female is heterozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele?