Foundations of Genetics 1.) The F1 generation of Mendel\'s monohybrid, cross sho

Question

Foundations of Genetics

1.) The F1 generation of Mendel's monohybrid, cross showed

a.Segregation of alleles

b. What a backcross could do

c. Which phenotype was dominant

d. The difference between a backcross and a testcross

2.) Based on the principle of independent assortment of genes, an organism with the genotype AaBb should form the following reproductive cells and their ratios:

a. AABB 1: AABb 1: AaBB 1: aabb 1

b. AA 1: aa 1: BB 1: bb 1

c. AABB 9: AABb 3: AaBB 3: aabb 1

d. AB 1: Ab 1: aB 1: ab 1

3.) In peas the allele W codes for round seeds and the allele w codes for wrinkled seeds. The allele G codes for yellow seeds and the allele g codes for green seeds. When scoring 1600 progeny from a cross WwGg X wwGg how many should have seeds that are round and yellow?

a. 600

   b. 200

c 400

d. 900

Explanation / Answer

Answer.

1. C. Which phenotype was dominant

In F1 one of the traits is masked.by the other trait. Recessive trait is masked by dominant trait.

2. D. AB1:AB1:aB1:aB1due to independent assortment, allele of one gene assorr independently. It means that A allele can form with allele B or b. Allele, a also in same way.

3. A. 600

WwGg x wwGg

Ww x ww= Ww(1/2), ww(1/2)

Gg x Gg = GG (1/4), Gg(1/2), gg(1/4)

Round yellow genotype = W_G_= 1/2* 3/4 = 3/8

3/8* 1600 = 600

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