In a Dihybrid Cross of Two Heterozygous Individuals, You Expect

question 17

Multiple Choice

In a dihybrid cross of two heterozygous individuals, you expect a 9:3:3:1 phenotypic ratio in the offspring, but observe a ratio of 9:7. What is the most likely explantation?

• A) Codominace
• B) It is a sex-limited trait
• C) Simple Mendelian inheritance
• D) Incomplete penetrance
• E) Epistatic interactions of the two genes

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Definitions:

Seminal Vesicle

Glands located near the male bladder that secrete fluid, which is a component of semen.

Seminiferous Tubules

These tubes contain spermatogenic cells and are located in the lobules of the testes.

Spermatogenic Cells

Cells located in the testis that go through the process of spermatogenesis to produce sperm.

Spermatids

Immature sperm before they develop their flagella (tails).