Question

6. Fill in the Punnett square for a cross between the following individuals. Aa x aa – dominant trait is red, recessive trait is white.

7. What are the genotypic and phenotypic ratios from this cross?

8. Calculate the degrees of freedom if 5 defined classes are being rested. Show your work

9. Determine the X2 using the following information. Show your work.

You hypothesize that the gene for rat coat color follows Mendelian inheritance. After you perform a cross between two monohybrids, you expect to get 75 black coats and 25 white coats in a population of 100. However, you observe 71 black coats and 29 white coats.

10. Using your answer from #9 determine the p-value. Is your hypothesis supported or rejected? How do you know?

Answer 1

6. Fill in the Punnett square for a cross between the following individuals. Aa x aa – dominant trait is red, recessive trait is white.

Answer: Punnett square:

	A	a
a	Aa ------ Red	aa ------ White
a	Aa ------ Red	aa ------ White

7. What are the genotypic and phenotypic ratios from this cross?

Genotypic ratio is 1:1, 50% are heterozygous i.e. Aa and 50% are homozygous recessive i.e. aa.

Phenotypic Ratio is 1:1, 50% are red which are dominant and 50% are white which are recessive.