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Why do individuals with an excessive number of sex chromosomes often show minimum
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- 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?Why would extra or missing chromosomes result to abnormal phenotypes?Why are aneuploidies in autosomal chromosomes likely to cause more severe phenotypes compared to aneuploidies in sex chromosomes?
- what is the significance of chromosomal aberration? what are the different types of chromosomal abberations based on the structure and number of chromosomes? give examples for each. what environmental factors may increase in the incidence of chromosomal aberrations?Which one of the following panels (A-D) illustrates the segregation of alleles on chromosomes in a cell of genotype M/m; B/b undergoing anaphase of mitosis?identify two main themes underlying the phenomena of chromosomal changes?
- A boy with Down syndrome (trisomy 21) has 46 chromosomes. One parent and his two older sisters have a normal phenotype, but each have 45 chromosomes. a)Explain how this is possible. b)How many chromosomes do you expect to see in karyotypes of the parents? c)What term best describes this kind of chromosome abnormality? d)What is the probability the next child of this couple will have a normal phenotype and have 46 chromosomes? Explain your answer.In the fruit fly Drosophila melanogaster, a recessive condition called eyeless (ey) significantly interferes with normal eye development. Eyes are either very small or absent. The ey gene is found on chromosome 4, which is the smallest of the four chromosomes in the organism. Individuals with a single copy or three copies of chromosome 4 are viable and can reproduce. A trisomic wild-type male is crossed with a disomic wild-type female: see attached image Determine the chromosome constitution and phenotypic ratios in the offspring. Assume random segregation of chromosomes into gametes.Which of the following is true for linked genes? a) Alleles of linked genes are often inherited together. b) Alleles of linked genes are randomly segregated into gametes due to independent assortment. O c) Linked genes are on the same chromosome, but far apart. Linked genes are located on different chromosomes.
- What criteria or features are used to identify each chromosome by number? What is the relationship between the severity of symptoms and the size of the chromosome involved in a trisomy?a) Assume that colour is controlled by a single sex-influenced gene where green is expressed preferentially in males. Individuals I-1 and I-2 are homozygous for red and green respectively. Which individual/s in generation II will be red? b) If colour is a controlled by cytoplasmic DNA, which individual/s in generation II will be green?What types of chromosomal disorders are easily seen with a karyotype?