Question

wednesday february 11th, 2025- ticket out the door
a scientist is studying genetics with complete dominance in flowers. if one parent is homozygous for the dominant gene, what principle is true no matter what genes the other parent carries?
a. all offspring will be affected by the dominant trait.
b. crossing over can affect the genes that the offspring carry.
c. multiple alleles always affects traits in offspring.
d. some offspring will show the recessive form of the trait.

Explanation:

In complete dominance, a homozygous dominant parent (e.g., AA) can only pass a dominant allele (A) to offspring. No matter the other parent's genotype (homozygous recessive aa, heterozygous Aa, or homozygous dominant AA), every offspring will inherit at least one dominant A allele, so they will express the dominant trait. Option B is incorrect because crossing over does not change the fact that the dominant allele is passed, and the question specifies this is true regardless of the other parent's genes. Option C is irrelevant as the scenario does not involve multiple alleles. Option D is wrong because offspring cannot show the recessive trait if they inherit a dominant allele.

Answer:

A. All offspring will be affected by the dominant trait.