In the Late 1920s,a Mutation Occurred in Many Silver Fox

question 60

Multiple Choice

In the late 1920s,a mutation occurred in many silver fox farms around the world.The fox farms that sold expensive furs were proud of the quality of their furs,and each advertised that it had the best,purest breed of all the fox farms.The new mutations produced a "platinum" coat pattern that was commercially desirable,so the farms crossed them to get more.The results of their breeding experiments were as follows: (1) silver ´ silver >>> all silver offspring; (2) silver ´ platinum >>> equal numbers of silver and platinum; (3) platinum ´ platinum >>> two platinum for each silver offspring.Which of the following inheritance patterns explain the breeding results?  

• A) Incomplete dominance of the silver trait
• B) Codominance of the silver and platinum alleles
• C) Multiple alleles exist that cancel out some traits
• D) Heterozygotes express the recessive platinum trait
• E) Homozygous alleles cause lethal effects

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Definitions:

HIV

Human Immunodeficiency Virus, a virus that attacks the immune system, leading to acquired immunodeficiency syndrome (AIDS) if not treated.

SIV

Simian Immunodeficiency Virus, a type of retrovirus that infects primates, sharing similarities with HIV and providing insights into the origins and transmission of AIDS in humans.

Hemagglutinin Stalk

A structural component of certain viruses that plays a critical role in the virus's ability to bind and enter host cells.