Question

18 multiple choice 2 points when a white cow (ww) is crossed with a roan cow (rr), we get a cow that is white with roan patches. this is an example of codominance multiple alleles polygenic inheritance incomplete dominance 19 multiple choice 2 points a recessive trait will be observed in individuals that are ____ for that trait. homozygous dominant homozygous recessive heterozygous 20 multiple answer 2 points which of the following are reasons why pea plants were a good choice for studying genetics. (choose all that are correct.) pea plants do not produce male and female gametes they produce many offspring in a short amount of time. pea plants have 7 easily recognizable traits mendel could control fertilization

Explanation:

1. In the cross of a white cow (WW) and a roan cow (RR) resulting in a cow with white and roan patches, both alleles are fully expressed simultaneously, which is the definition of codominance. Multiple alleles involve more than two alternative forms of a gene, polygenic inheritance is when a trait is controlled by multiple genes, and incomplete dominance results in an intermediate phenotype.
2. A recessive trait is only observed in individuals who are homozygous recessive, as the presence of a dominant allele will mask the recessive one in homozygous - dominant and heterozygous individuals.
3. Pea plants were a good choice for studying genetics because they produce many offspring in a short time, have 7 easily - recognizable traits, and Mendel could control fertilization. Pea plants do produce male and female gametes.

Answer:

1. A. codominance
2. B. homozygous recessive
3. B. They produce many offspring in a short amount of time., C. Pea plants have 7 easily recognizable traits., D. Mendel could control fertilization.