In pea plants, plant height, seed shape, and seed color ...

Question

In pea plants, plant height, seed shape, and seed color are governed by three independently assorting genes. The three genes have dominant and recessive alleles, with tall (T) dominant to short (t), round (R) dominant to wrinkled (r), and yellow (G) dominant to green (g).

If a true-breeding tall, wrinkled, yellow plant is crossed to a true-breeding short, round, green plant, what phenotypic ratios are expected in the F₁ and F₂?

Accepted Answer

Hi, everyone. Let's take a look at this practice problem together. If two parents are both heterozygous for a trait, what is the probability that their offspring will be? Homozygous recessive for that trait? The answer options are A zero B one out of four, C, one out of two and D three out of four. So for this problem, let's assume that our trait is represented by the letter B where capital B is the dominant. A little and lower case B is the recessive A lil. So we are told that both parents are heterozygous, meaning that their genotypes are capital B, lowercase B. Our cross therefore is between capital B, lowercase B, parent one with another capital B, lowercase B, parent two. And we solve this how by using the puit square. So the punt square results are on the screen analyzing the punt square. There is four offspring and one of those is homozygous recessive or lower case B, lower case B genotype. That means the correct answer is option B one out of four. All right, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.

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