In Genetics, the Dash Symbol (-) Is a "Wild Card

question 129

Multiple Choice

In genetics, the dash symbol (-) is a "wild card" that stands for either the dominant allele or the recessive allele; for example, A- means the individual has either the genotype AA or Aa. Two genes that undergo independent assortment affect coat color in Duroc pigs. Each gene has two alleles, one of which is dominant for coat color. Genotypes of the form A- B- are red, those of the form A- bb and aa B- are sandy, and genotype aa bb is white. What ratio of red : sandy : white is expected from the cross Aa Bb × Aa Bb?

• A)10:3:3
• B)9:3:4
• C)12:3:1
• D)9:6:1

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Definitions:

Testosterone

A primary male sex hormone and an anabolic steroid, crucial for the development of male reproductive tissues and secondary sexual characteristics.

Sebum

An oily substance secreted by sebaceous glands in the skin that helps to keep the skin and hair moisturized.

Eccrine Sweat Gland

A type of sweat gland that is primarily involved in thermoregulation, secreting a watery fluid directly onto the skin surface.

Sebaceous Gland

A small gland in the skin that secretes sebum into hair follicles to lubricate the skin and hair, found in greatest abundance on the face and scalp.