Sniffles, a male mouse with a colored coat, was mated with Esmeralda, an allurin
ID: 258688 • Letter: S
Question
Sniffles, a male mouse with a colored coat, was mated with Esmeralda, an alluring albino. The resulting litter of six young all had colored fur. The next time around, Esmeralda was mated to Whiskers, who was the same color as Sniffles. Some of Esmeralda's next litter were white. A. What are the probable genotypes of sniffles_____ whiskers____ esmeralda____ B. If a male of the first litter were mated with a colored female of the second litter, what phenotypic ratio might be expected among the offspring? C. What would the expected results be if a male from the first litter was mated with an albino female from the second litter?
Explanation / Answer
Leta say coloured fur is because of dominant allele C and albino trait is for recessive allele c.
Now as all the 1st litter were coloured the genotype of Sniffles will be CC and genotype of esmeralda will be cc
Cc
coloured fur
Cc
coloured fur
Cc
coloured fur
Cc
coloured fur
Esmeralda X whiskers = some are white fur so the genotype of whiskers needs to be heterozygous Cc
Cc
coloured fur
Cc
coloured fur
cc
white fur
cc
white fur
So 50% chance of white fur.
B. Male of the 1st litter X coloured female of the 2nd litter
Cc X Cc
CC
Coloured fur
Cc
Coloured fur
Cc
Coloured fur
cc
white fur
Phenotypic ratio= Coloured fur : white fur = 3:1
C) Male from 1st litter X albino female from 2nd litter
Cc X cc
Cc
Coloured fur
Cc
Coloured fur
cc
white fur
cc
white fur
Coloured fur : white fur = 1:1
c c CCc
coloured fur
Cc
coloured fur
CCc
coloured fur
Cc
coloured fur
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