Question

In pea plants there is a dominant allele (A) for green pods and a recessive allele (a) for yellow pods. Suppose a heterozygous plant is crossed with a plant that has yellow pods. Complete the sentences about this monohybrid cross with the correct terms.
The phenotype of the heterozygous plant is
The genotype of the heterozygous plant is
The genotype of the plant with yellow pods is
The genotype of the gametes produced by the heterozygous plant is
The genotype of the gametes produced by the plant with yellow pods is
The expected frequency of F_1 plants with yellow pods is
The expected frequency of F_1 plants with the genotype AA is
Aa
75% A and 25% a
25%
50% A 50% a
0%
green pods
75% AA and 25% Aa
AA
yellow pods
75%
aa
50%
100% A
100% a

Answer 1

Answer and Explanation:

• The phenotype of the heterozygous plant is green pods

• The genotype of the heterozygous plant is  Aa

• The genotype of the plant with yellow pods is  aa

• The genotype of the gametes produced by the heterozygous plant is  50% A 50% a

• The genotype of the gametes produced by the plant with yellow pods is 100% a  

• The expected frequency of F_1 plants with yellow pods is  50%

• The expected frequency of F_1 plants with the genotype AA is 0%

Cross) a heterozygous plant is crossed with a plant that has yellow pods

Parental)           Aa         x          aa

Phenotype)  Green pods   Yellow pods

Gametes)   A        a                a         a

                 50%     50%               100%

Punnet Square)          A                 a

                       a          Aa              aa

                       a          Aa              aa

F1) 2/4 = 1/2 = 50% Aa, Plant with Green pods

     2/4 = 1/2 = 50% aa, Plant with Yellow pods

Answer 2

In the given case, the correct terms are:

• The phenotype of the heterozygous plant is green pods
• The genotype of the heterozygous plant is Aa
• The genotype of the plant with yellow pods is aa
• The genotype of the gametes produced by the heterozygous plant is  50% A 50% a
• The genotype of the gametes produced by the plant with yellow pods is 100% a  
• The expected frequency of F_1 plants with yellow pods is  50%
• The expected frequency of F_1 plants with the genotype AA is 0%

It is given that A gives green color which is dominant and a gives yellow pods which is a recessive trait. So in heterozygous conditions, only the dominant character will express itself therefore green color pods

• The phenotype of heterozygous plants is Green pods

In heterozygous conditions, the alleles of a genotype are different. Therefore one allele is A and the other is a

• The genotype of the heterozygous plant is Aa

The yellow color of pods is a recessive trait and recessive trait if expressed only in the same alleles conditions that mean it is given by allele a. Therefore, the genotype of yellow pods is aa

• The genotype of the plants with yellow pods is aa

The alleles in the heterozygous conditions are A and a so half of the gametes will have A and the other half have a

• The genotype of gamete produced by heterozygous plants are 50% A and 50% a

The yellow pods are obtained by genotype aa. All the gametes are a

• The genotype of gametes produced by the plants with yellow pods is 100% a

Cross:

       A       a

a       Aa     aa

a       Aa     aa

In the cross, there are 2 genotypes produced as aa out of four. So 2/4 × 100 will give 50%

• The expected frequency of F1 plants with yellow pods is 50%

There are no genotypes obtained as AA in the cross. Therefore, 0 out of 4 offspring will give 0%

• The expected frequency of F1 plants with genotype AA is 0%

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