Question

A pea plant with yellow seeds is crossed with a pea plant with green seeds. all of the offspring have yellow seeds. the allele for yellow seeds is...
a. dominant because all the offspring have yellow seedsb. recessive because all the offspring have yellow seeds.
c. dominant because all of the offspring inherited two alleles for yellow seeds.
d. recessive because all of the offspring inherited two alleles for yellow seeds ****2. two tall pea plants with yellow seeds and smooth pods are crossed. all of the offspring are crossed. all of the offspring are tall. three offspring have smooth pods and one has wrinkled pods. allele for wrinkled podsa, must be dominated because the traits does not appear in the parent plants.b, must be recessive because the trait does not appear in the parent plants.****c, must be dominant because the trait appears in the parent plants.d, must be recessive because the trait appears in the parent plants.

Answer 1

1. Well, if you know the difference between dominant and recessive, then this is an easy one. Dominant = Big trait, the most likely for offspring to inherit. Recessive = Small trait, least likely for offspring to inherit. So, if all of them got yellow seeds...

2. At least one of the plants must be Heterozygous, which means they carry one dominant trait and one recessive trait. If 75% got smooth pods and 25% got wrinkled pods...

These are pretty easy if you know about Dominant and Recessive, and Heterozygous and Homozygous (Parent with 2 identical alleles)

Answer 2

Answer:

1. A. The allele for yellow seeds is dominant because all of the offspring have yellow seeds.

2. B. The allele for wrinkled pods must be recessive because the trait does not appear in the parent plants.

Explanation:

In the first case, the allele for yellow seeds is clearly dominant, most likely homozygous because all the offspring, in two generations, have the same trait.

In the second case, the allele for wrinkled pods is clearly recessive, because even though the parents do not display this trait, it appears in the offspring. Also, dominant and recessive traits are commonly displayed in a 3 to 1 ratio. Dominant traits are more common because both heterozygous and homozygous organisms display the dominant phenotype, smooth pods in this case.