Felicity draws this diagram on the board to explain one of Mendel's experiments for her classmates. She says that it shows the cross between two first-generation offspring. What is the error in her diagram?

OPTIONS:

A. All peas should be green.

B. All peas should be yellow-green.

C. One pea should be green and three peas should be yellow.

D. One pea should be yellow and three peas should be green.

C. One pea should be green and three peas should be yellow.

Explanation:

In Mendel’s experiment, the allele for yellow seed color iss dominant, while the green allele is recessive. His experiment involves crossing two true breeding pea plants that are homozygous for various selected traits. For example, for seed color, each of the parent plants are homozygous for each of the seed color. i.e. one is homozygous dominant for yellow seed  (YY), while the other is homozygous recessive for green color  (yy).

The first filial generation gotten from the cross between both parents has all the offspring of the F1 generation having yellow seed color. They were all heterozygous  (Yy), since yellow color is dominant over green color, all F1 individuals appeared similar to their parents and were all had yellow seeds.

When two first-generation offspring were crossed together, the ratio of individuals having Yellow seed color to green seed color was 3:1, meaning a cross between two F1 generation should give us 1 pea plant with green seed color and 3 peas should have yellow.

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