Q2 a a) Give three reasons why a diploid individual will not produce a gamete wi
ID: 90092 • Letter: Q
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Q2 a a) Give three reasons why a diploid individual will not produce a gamete with exactly the same DNA as either of the haploid gametes that fused to form that individual. Explain your answers. b) What characteristic of the human X chromosome and Y chromosome allows them to pair up during meiosis in males? c) Non-disjunction of the X chromosome during meiosis in human females can create gametes containing two X chromosomes. Explain why females formed by fertilization of such gametes are functionally normal. Suppose that only two genes control height in humans, and that the environment has no effect. One gene has alleles A and a, where A is incompletely dominant with a. The other gene has alleles B and b, where B is incompletely dominant with b. Individuals with genotype A A B B have the tallest height. A contributes the same amount to height as B does. a contributes the same amount to height as b does. For example, individuals with genotype A A b b or A a B b have the same height. a) How many different categories of height would occur? Explain. b) How would the distribution of height in the population be different if the environment did haveExplanation / Answer
2) a) Diploid individuals will not produce a gamete with exactly same DNA as either of the haploid gametes that fused to form that individual because of crossing over of chromatids during meiosis, separation of sister chromatids and possible non disjunction of chromosomes.
b) X and Y chromosomes have the same genes in same loci except for the presence of SRY gene in Y chromosome. X and Y chromosomes are homologous chromosomes. This allows them to pair up during meiosis.
C) Females with triple X syndrome behave normally because sex determination is determined only by the presence of Y chromosome.
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