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 black, red or yellow. Use the data from the families below (parental gentoypes are unknown) to answer questions 1 - 3. Parents Offspring family alpha black yellow alpha omega omega black ½ yellow 1 black yellow yellow ½ red yellow yellow yellow black 4 yellow ½ black ½ yellow black ½ black ½ yellow ½ black ½ yellow ½ black ½ yellow red black black 1. The genotype of the red parent in family 6 is best described as a) r/r b) R/R e) X/ 2. The genotype of the black parent in family 5 is best described as a) Bl/BI 3. 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 autosomal gene with multiple alleles and complete dominance e) a single sex-linked gene with multiple alleles and complete dominance

Explanation / Answer

1) Xr/l

Alpha has XX while to be an omega needs to be Xl. The spine color is X linked with red(r) dominant over black and yellow being dominant over red and black. Hence in the 6th cross alpha has a genotype of XY/Xbl while that of omega is Xr. the alpha and omega progeny would be Xy yellow or Xbl black.

2) XBl/Xy

The genotype of parent is best described as Xbl/Xy as it is dominant and half of the offspring are of black phenotype.

3) d) a single autosomal gene with multiple alleles and complete dominance

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