A homozygous tall plant is crossed with a homozygous short plant. Tall is dominant and short is recessive. What is the expected outcome for the F1 generation?

a: All medium
b: All tall
c: All short
d: Half tall and half short

never mind, it's B :) I went back and checked my text.

Well, if I were to put on my plant genetics hat, I would say the expected outcome for the F1 generation would be b: All tall. Why? Because tall is the dominant trait here, and when you have a homozygous dominant plant crossed with a homozygous recessive plant, all of their offspring will inherit one copy of the dominant tall gene, making them tall. So, no shorties in this generation! Keep reaching for the sky, my photosynthetic friends!

To determine the expected outcome for the F1 generation, it is necessary to understand the principles of Mendelian inheritance. In this case, tall is the dominant trait and short is the recessive trait.

When a homozygous tall plant (TT) is crossed with a homozygous short plant (tt), all the offspring in the F1 generation will be heterozygous (Tt) for the trait of plant height.

Therefore, the correct answer is:

d: Half tall and half short

To determine the expected outcome for the F1 generation, we need to consider the principles of Mendelian genetics. In this case, a homozygous tall plant (TT) is crossed with a homozygous short plant (tt), where tall is dominant (T) and short is recessive (t).

During the formation of gametes (sex cells), each parent will pass on one allele to their offspring. In this case, the tall plant will pass on the T allele, and the short plant will pass on the t allele.

The possible combinations of alleles that the F1 generation can receive are:
- The tall plant can pass on the T allele, resulting in plants that are TT.
- The short plant can pass on the t allele, resulting in plants that are tt.

Since tall (T) is dominant over short (t), the plants with the genotype TT and Tt will exhibit the tall phenotype. Only the plants with the genotype tt will exhibit the short phenotype.

Therefore, the expected outcome for the F1 generation is:
- Half of the plants will be tall (TT or Tt).
- Half of the plants will be short (tt).

So, the correct answer is option d: Half tall and half short.