4. 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 1. In a cross between mice the genotypes AB/ab x ab/ab, what is the recombination frequency if the progeny numbers are 72 AB/ab, 68 ab/ab, 17 Ab/ab, and 21 aB/ab? The alleles are shown for each chromosome, separated by a slash (/). . 2. A cross between fruit files with genotypes Aa Bb × aa bb produces the following progeny: 10 Aa Bb 40 Aa bb 40 aa Bb 10 aa bb Were the parental alleles in the coupling or repulsion configuration? Briefly explain. 3. Briefly describe how twin studies can reveal whether or not the appearance of a trait is strongly influenced by genetics.
4. 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 1. In a cross between mice the genotypes AB/ab x ab/ab, what is the recombination frequency if the progeny numbers are 72 AB/ab, 68 ab/ab, 17 Ab/ab, and 21 aB/ab? The alleles are shown for each chromosome, separated by a slash (/). . 2. A cross between fruit files with genotypes Aa Bb × aa bb produces the following progeny: 10 Aa Bb 40 Aa bb 40 aa Bb 10 aa bb Were the parental alleles in the coupling or repulsion configuration? Briefly explain. 3. Briefly describe how twin studies can reveal whether or not the appearance of a trait is strongly influenced by genetics.
Question
Transcribed Image Text:4. 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
Transcribed Image Text:1. In a cross between mice the genotypes AB/ab x ab/ab, what is the recombination frequency if the
progeny numbers are 72 AB/ab, 68 ab/ab, 17 Ab/ab, and 21 aB/ab? The alleles are shown for each
chromosome, separated by a slash (/). .
2. A cross between fruit files with genotypes Aa Bb × aa bb produces the following progeny:
10 Aa Bb
40 Aa bb
40 aa Bb
10 aa bb
Were the parental alleles in the coupling or repulsion configuration? Briefly explain.
3. Briefly describe how twin studies can reveal whether or not the appearance of a trait is strongly
influenced by genetics.
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