In a testcross for two genes, what types of gametes are produced with (a) complete linkage, (b) independent assortment, and (c) incomplete linkage?
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In a testcross for two genes, what types of gametes are produced with (a) complete linkage, (b) independent assortment, and (c) incomplete linkage?
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- For a certain chromosomal region, the mean number of crossovers at meiosis is calculated to be two per meiosis. In that region, what proportion of meioses are predicted to have (a) no crossovers? (b) one crossover? (c) two crossovers?For a certain chromosomal region, the mean number ofcrossovers at meiosis is calculated to be two per meiosis.In that region, what proportion of meioses are predicted to have (a) no crossovers? (b) one crossover? (c) twocrossovers?How many different types of gametes can be formed by individualsof the following genotypes? What are they in each case?(a) AaBb, (b) AaBB, (c) AaBbCc, (d) AaBBcc, (e) AaBbcc, and(f) AaBbCcDdEe?
- In garden peas, yellow seeds (Y)(Y) are dominant to green seeds (y)(y), and inflated pods (I)(I) are dominant to constricted pods (i)(i). Suppose you have crossed YYIIYYII parents with yyiiyyii parents. What would be all the genotype(s) of gametes produced by F1F1 individuals?You are working with a hypothetical fly and have found color and wing mutants. Preliminary work indicates that the mutant traits are recessive and the associated genes are not sex-linked, but beyond that, you have no information. You first look at 2 genes, each with 2 alleles. "B" or “b" for body color and "W" or "w" for wing surface. The red-body phenotype is dominant to the yellow-body phenotype and smooth wings are dominant to crinkled wings.Fruit flies can have straight wings (S) or curly wings (s), and they can have be female XX or male XY. (A) For a standard monohybrid cross (Ss ´ Ss), what proportion of the offspring will have the genotype ss? (Express the proportion as a simple fraction) (B) For the following cross (SsXX ´ SsXY), what proportion of the offspring will have the genotype Ss? (Express the proportion as a simple fraction) (C) What proportion will have the genotype XX? (Express the proportion as a simple fraction) (D) What proportion will have the genotype SsXX? (Express the proportion as a simple fraction)SHOW YOUR WORK
- In a cross between a white-eyed female (ww) and a red-eyed male (w+Y), nearly all the progeny were either red-eyed females (w+w) or white-eyed males (wY). However, about 1 in every 2000 F1 flies had an "exceptional phenotype" and was either a white-eyed female or red-eyed male. How did Bridges explain this unexpected result? A) Crossing over B) Incomplete cytokinesis C) Incorrect synapsis D) Nondisjunction E) Pseudoautosomal region(a) During which division of meiosis do Mendel's rules of Segregation and Independent assortment аpply? (b) The genotype of F1 individuals in a tetrahybrid cross is AaBbCcDd. Assuming independent assortment of these 4 genes what are the probabilities that F2 offspring will have the following genotypes? (i) AABBCCDD (ii) AaBBccDd (c) If the quantity of DNA in a cell at G1 of the cell cycle is 5 picograms (pg); what will the quantity of DNA in that cell be at G2 phase of the cell cycle? Give reasonDiscuss the following concepts: (a) homologous chromosomes x ½ = 2) (b) diploidy (c) haploidy Answer the following questions with either True or False. Provide a justification for your choice. (a) Alleles occupy different loci on homologous chromosomes. (b) Although alleles govern the same kinds of characteristics, they do not necessarily contain identical information. (e) The special region on a duplicated chromosome that holds the sister chromatids together is a centrosome. What names are assigned to chromosomes on the basis of their centromere placement, and where is the centromere located in each case?
- In humans, six fingers (F) is dominant to five fingers (f). Assume both parents are heterozygous for six fingers.c) What are the different gametes each parent can produce?Assume that the trihybrid cross AABBrr x aabbRR is made in a plant species. Assume that A and B are dominant alleles, but there is no dominance effect of alleles at the R locus. a) How many different gametes are possible in the F1generation? What are the genotypes of these gametes? b) What is the probability of the parental aabbRR genotype in the F2 progeny? c) What proportion of the F2 progeny would be expected to be homozygous for all three genes?Assume performing only one cross, which produced 274 flies, which consisted of 193 wild-type flies and 81 white-eyed flies. (a) Based upon this information, what is the most likely genotype of the female parent? (b) How to confirm the above answer with only the result from this one cross?