In Pea Plants, the Gene for Round Seed (R) Is

question 18

Multiple Choice

In pea plants, the gene for round seed (R) is dominant, and wrinkled seeds (r) are recessive. The endosperm of the pea is also either starchy, a dominant gene (S) , or waxy (s) . What can be said of a fully heterozygous, dihybrid cross?

• A) It is impossible to secure offspring that are homozygous for both dominant genes.
• B) It is impossible to secure offspring that are homozygous for both recessive genes.
• C) It is impossible to secure offspring that are homozygous for one dominant gene such as round seed and homozygous recessive for the other recessive waxy gene.
• D) All of these choices are impossible combinations in a dihybrid cross.
• E) All of these choices are possible combinations in a dihybrid cross.

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Definitions:

Jejunum

The middle section of the small intestine, where the majority of nutrient absorption occurs.

Ileum

The final and longest segment of the small intestine, responsible for the absorption of nutrients and vitamins.

Duodenum

The first section of the small intestine immediately following the stomach, playing a crucial role in digestion.

Villi

Finger-like projections on the wall of the small intestine that increase surface area for absorption of nutrients.