Two true-breeding pea plants are crossed. One parent is round, terminal, violet, constricted, while the other expresses the contrasting phenotypes of wrinkled, axial, white, full. The four pairs of contrasting traits are controlled by four genes, each located on a separate chromosome. In the F1 generation, only round, axial, violet, and full are expressed. In the F2 generation, all possible combinations of these traits a

The question is incomplete as it lacks te end part of the question. However, the missing part is as follows:

In the F2 generation, all possible combinations of these traits were expressed in ratios consistent with Mendelian inheritance. Identify the four dominant traits, and enter them in ALPHABETICAL order in the blanks provided. [x],[y],[z],[a].

The correct answer is :

x)axial

y)full

z)round

a)violet

Explanation:

True breeding organisms are organisms that carry two same alleles of a particular trait or character either dominant or recessive. In this given case the two breeding plants have four distinct traits, round, terminal, violet, constricted in one parent and wrinkled, axial, white, full in other.

In f1 there would be only dominant alleles for these characters will be expressed, that is already given in the question-

round, axial, violet, and full

The alphabetical arrangement of the dominant alleles are-

x)axial

y)full

z)round

a)violet

the answer is d.) homologous; have mammary glands