1. 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 seeds
B. 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 pods
A, 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.
What answers?
need biology teacher
a and b
abadc
a
b
a
d
c
a and b
1. In order to determine which allele is dominant or recessive, we need to understand the basic principles of Mendelian genetics. Mendel's laws state that each individual inherits two copies of each gene, called alleles, one from each parent. These alleles can be either dominant or recessive. In this case, a pea plant with yellow seeds is crossed with a pea plant with green seeds, and all of the offspring have yellow seeds.
To determine the allele for yellow seeds, we need to consider if the trait is dominant or recessive. The allele that determines yellow seeds must be present in all the offspring, as seen in the question.
Options A and C state that the allele for yellow seeds is dominant because all the offspring have yellow seeds or inherited two alleles for yellow seeds.
Options B and D state that the allele for yellow seeds is recessive because all the offspring have yellow seeds or inherited two alleles for yellow seeds.
Since the offspring all have yellow seeds, it means that the allele for yellow seeds must be dominant. Therefore, the correct answer is:
A. Dominant because all the offspring have yellow seeds.
2. Similar to the first question, we need to determine the allele for wrinkled pods based on the information provided. When two tall pea plants with yellow seeds and smooth pods are crossed, all the offspring are tall. However, three offspring have smooth pods, and one has wrinkled pods.
To determine the allele for wrinkled pods, we need to consider if the trait is dominant or recessive.
Options A and C state that the allele for wrinkled pods must be dominant because the trait does not appear in the parent plants or appears in the parent plants.
Options B and D state that the allele for wrinkled pods must be recessive because the trait does not appear in the parent plants or appears in the parent plants.
Since the trait of wrinkled pods is present in one of the offspring but not in the parent plants, it indicates that the allele for wrinkled pods must be recessive. Therefore, the correct answer is:
B. Must be recessive because the trait does not appear in the parent plants.