Question

1. A plant has gene A (alleles A and a) and B (alleles B and b). If a plant with a genotype of AaBb is crossed with a plant of genotype aabb, what would be the expected ratio of the genotypes of the offspring? Assume the two genes are on different chromosomes. O A. 1:1:1:1 B. 1:2:1:2 OC. 2:1:2:1 8. A plant has gene A (alleles A and a) and B (alleles B and b). If a plant with a genotype of Ab/AB is crossed with a plant of genotype ab/Ab, what would be the expected ratio of the genotypes of the offspring? Assume the two genes are on the same chromosomes as indicated by the /. Please show your work O A. 1:1:1:1 OB. 1:2:1:2 C. 2:1:2:1 9. A plant has two genes that each has two alleles (D and d and E and e). A plant with a genotype DdEe is crossed with a plant with a genotype of DDEE. What is a prediction of the ratio of each genotype that will result from this cross? Show your work. Assume the genes are on different chromosomes. O A. 1:1:1:1 OB. 1:2:1:2 OC. 2:1:2:1

I have no idea what any of these numbers means even when I create my own punnet square with all of the possible outcomes.

Answer 1

7) AaBb * aabb

	AB	Ab	aB	ab
ab	AB/ab	Ab/ab	aB/ab	ab/ab

the genotypic ratio

AB/ab:Ab/ab:aB/ab:ab/ab=1:1:1;1

so the answer is A) 1:1:1;1

8) Ab/AB * ab/Ab

given both genes are on the same chromosome but it is not mentioned whether the genes are linked to each other or not assuming the genes are not linked to each other.

	Ab	AB
ab	Aabb	AaBb
Ab	AAbb	AABb

the expected genotypic ratio is

Aabb:AaBb:AAbb:AABb=1:1:1:1

so the answer is A)1:1:1:1

9) DdEe * DDEE

	DE	De	dE	de
DE	DDEE	DDEe	DdEE	DdEe

the genotypic ratio is

DDEE:DDEe:DdEE:DdEe=1:1:1:1

so the answer is A)1:1:1:1