You are a xenogeneticist studying groggins from the planet Zabar. They do not ha

Question

You are a xenogeneticist studying groggins from the planet Zabar. They do not have males and females, but there are mating types: alpha and omega. Groggins are hard to grow in the lab, so you are using several families of parents and offspring to determine the genetic basis of the tail spine color trait. Spines may be red, yellow or white. Use the data from the families below (parental gentoypes are unknown) to answer questions 1-3. The genotype of the red parent in family 6 is best described as: a) r/r b) R/R c) R/y d) X^r/X^Y e) X^r/The genotype of the yellow parent in family 5 is best described as: a) Y/Y b) Y/y c)X^Y/X^w d) X^Y/X^gamma e) X^gamma/The genetic basis of tail spine color is best described as: a) a single autosomal gene with codominant alleles b) two interacting genes each with two alleles c) a single sex-linked gene with codominant alleles d) a single sex-linked gene with multiple alleles and complete dominance e)a single autosomal gene with multiple alleles and complete dominance

Explanation / Answer

1)e

2)d

3)d

Alpha has XX while to be an Omega it needs a X/. The spine color is X-linked with r(red) being dominant over w(white) and Y (yellow) being dominant over both red and white.

Hence in the 6th cross, alpha has a genotype of XY/Xw while that of Omega is Xr/. Hence the alpha progeny would be either XY/Xr (yellow) or Xw/Xr (red, while omega would be XY/ (yellow) or Xw/ (white).

Similarly, in the 5the cross the genotype for alpha would be XY/Xr while that of omega would be Xr/.

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