Question

19. Your colleague is studying long toes in the California towhee. She proposes that this trait is! due to to an Z-linked dominant allele. You go for a hike in Oakland, and notice that only few of the California towhees you see have the long toe trait. Does this affect your colleague's hypothesis? How? Why? (2 points) You go for a walk in Golden Gate Park, and notice that, among California towhees in the Golden Gate population, females are more likely than males to have the long toe trait. Does this affect your colleague's hypothesis? How? Why? (2 points) 20. You are a genetic counseler. A mother and father with a son and a daughter come to see you. The mother and the father both have a very rare condition that no one has ever studied, but neither their son or their daugther does. Karyotype analysis shows that the mother and the daugther are XX and the father and the son are XY. You think about it and realize that this pattern cannot be due to a number of simple inheritance patterns. Explain why: Why can't it be an autosomal dominant condition? (2 points) Why can't it be Y-linked condition? (2 points) Why can't it be an X-linked dominant condition? (2 points) Why can't it be an X-linked recessive condition? (2 points) Why can't it be a mitochondrial condition? (2 points)

Answer 1

(i) Yes. It does not support my colleage's hypothesis because of the mode o inheritance is a dominant one then majority of individuals in a population Chomozygous as well as heterozygous) should have the long toe phenotype ♡ Ves. It does not support my colleagees hypothesis because it a specific sex is poeketined to a phenotype then the gene is most Ciklly bled to one of idle z sex chromosomes.

fernales are zw you while males are zz. So now it the claim is of the gene daingndinked to more males should expre's the phendype as Pt is 2-linked dominant.