In rats, black fur color is dominant to white fur color, and pointy ears are dominant to round ears. You cross a homozygous black, pointy eared rat to a homozygous white, round eared rat. You then Cross one of the F1 offspring to a homozygous white, round eared rat, and obtain the following progeny: 88 black, pointy eared rats; 92 white, round eared rats; 76 black, round eared rats; 81 white, pointy eared rats. Perform a chi-square test of independence to determine if the genes for fur color and ear shape are linked, or assort independently. Show all of your work.
In rats, black fur color is dominant to white fur color, and pointy ears are dominant to round ears.
You cross a homozygous black, pointy eared rat to a homozygous white, round eared rat. You then
Cross one of the F1 offspring to a homozygous white, round eared rat, and obtain the following
progeny: 88 black, pointy eared rats; 92 white, round eared rats; 76 black, round eared rats; 81
white, pointy eared rats.
Perform a chi-square test of independence to determine if the genes for fur color and ear shape are
linked, or assort independently. Show all of your work.
Introduction
The relationship between two gene variants is referred to as dominant. Each parent gives each child two copies of each gene, referred to as alleles. One allele will be expressed if the alleles of a gene are different; this is the dominant gene. The effect of the recessive allele is hidden.
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