Genetics help 1. (1pt) In the guinea pig, one locus involved in the control of c
ID: 188630 • Letter: G
Question
Genetics help1. (1pt) In the guinea pig, one locus involved in the control of coat color may be occupied by any of four alleles: C (full color), c (sepia), e (cream, or c (albino), with an order of dominance of: Cse. (C is dominant to all other, etc) In the following cross, determine the parental genotypes and predict the phenotypic ratios that would result: sepia x cream, where both guinea pigs had an albino parent 2. (2pts) In shorthorn cattle, coat color may be red, white, or roan. Roan is an intermediate phenotype expressed as a mixture of red and white hairs. The following data are obtained from various crosses: red x red all red white x white all white red x white all roan roan x roan ¼ red: ½ roan: 14 white a) Does the roan phenotype illustrate a case of incomplete dominance or a case of codominance? Explain b) From these results, what are the genotypes of parents and offspring for each cross?
Explanation / Answer
Question 1.
Sepia x Cream, where both guinea pigs had an albino parent
Parents from sepia Parents from cream
caca x cacs caca x cacc
F1 csca X F2 ccca
Punnett chart
cc
ca
cs
cs cc
cs ca
ca
ca cc
ca ca
Phenotypes:
Sepia: 2
Cream: 1
Albino: 1
Question 2.
RED X RED -> all RED
Parents
CR CR X CR CR
CR
CR
CR
CR cR
CR CR
CR
CR CR
CR CR
White X White --> all RED
CW CW X CW CW
CW
CW
CW
CR cR
CR CR
CW
CR CR
CR CR
RED X WHITE --> all ROAN
CR CR X CW CW
CW
CW
CR
CR cW
CR CW
CR
CR CW
CR CW
Roan X Roan --> ¼ RED , ½ ROAN, ¼ WHITE
CR CW X CR CW
CR
CW
CR
CR cR
CR cW
CW
CW cR
CW cW
cc
ca
cs
cs cc
cs ca
ca
ca cc
ca ca
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