True-breeding female rats with yellow bodies and rosy eyes were crossed with tru
ID: 168906 • Letter: T
Question
True-breeding female rats with yellow bodies and rosy eyes were crossed with true-breeding wild-type males with gray-brown bodies and red eyes. The F1 rats were inbred to produce an F2 generation. The phenotypes of the F2 were as follows:
yellow, rosy
Yellow ,red
gray-brown, rosy
gray-brown, red
F2 males
1/8
3/8
1/8
3/8
F2 females
1/8
3/8
1/8
3/8
a) How are these traits inherited?
b) Using symbols of your own choice draw a diagram showing the inheritance of the alleles producing the yellow and rosy traits in this cross.
c) What were the phenotypes of the F1 males and females from this cross?
d) Diagram the F2 results using the branch diagram method.
yellow, rosy
Yellow ,red
gray-brown, rosy
gray-brown, red
F2 males
1/8
3/8
1/8
3/8
F2 females
1/8
3/8
1/8
3/8
Explanation / Answer
a) How are these traits inherited?
eye color is sex-limited (males cannot be rosy; rosy only shows up in females) and red isdominant, rosy is recessivebody color is sex-linked and gray-brown is dominant and yellow is recessive.
b) Using symbols of your own choice draw a diagram showing the inheritance of the alleles producing the yellow and rosy traits in this cross.
Parent 1: Genotype = XgXgrr__________Phenotype =yellow, rosy______________
Parent 2: Genotype =XGYRR____________Phenotype =ray-brown, red_______
c) What were the phenotypes of the F1 males and females from this cross?
Yellow and rosy.
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