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

question 184

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 the house mouse. Each gene has two alleles, one of which is dominant for coat color. Genotypes of the form A- B- have a brownish color called agouti, those of the form A- bb are black, and those of the form aa B- and aa bb are albino (white) . What ratio of agouti : black : 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:

Genetic Risk Factors

Hereditary elements that increase the likelihood of developing certain diseases or conditions.

Vitamin D

A fat-soluble vitamin critical for bone health, immune functioning, and modulation of cell growth, obtained through sunlight exposure, diet, and supplements.

Autoimmune Diseases

Disorders in which the body's immune system attacks healthy cells, believing them to be foreign substances.

Antibodies

Proteins produced by the immune system to identify and neutralize foreign objects such as bacteria and viruses.