You have three guinea pigs: white, orange, and brown. You wanted to make some cr

Question

You have three guinea pigs: white, orange, and brown. You wanted to make some crosses to determine inheritance pattern for coat color. Assume that one gene is responsible for coat color.

(P) Orange X (P) white = (F1) 1 Red : 1 Yellow

(F1) Red X (F1) red = (F2) 3 red : 1 white

(F2) White X (P) Brown = (F1) 1 brown : 1 white

(F1) Brown X (F1) Brown = (F2) 3 brown : 1 white

(P) Orange X (P) Orange = 1 red : 2 orange : 1 yellow

(P) Brown X (P) Orange = 1 red : 1 yellow

a. Based on these results, what are the genotypes of these guinea pigs? Make sure to show the Punnet squares for each individual cross listed above. (8pts)

b. You cross an Orange guinea pig with a (F1) yellow guinea pig. What is the probability that out of 5 offspring, 3 are orange? (4pts)

Explanation / Answer

There are 3 parental genotypes for the skin colour and this is an example of incomplete dominance.

Red:AAbbcc, Yellow: aaBBcc, Brown: aabbCC, recessive allele white: aabbcc. recombinant phenotype is oragne: AaBbCc

http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio%20101/bio%20101%20lectures/genetics-%20genes/Image1.gif

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