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

Question

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

Quizplus · Accepted Answer

The breeding results suggest that the platinum trait is recessive and that homozygosity for the platinum allele may cause lethal effects, as indicated by the unexpected ratio in the platinum x platinum cross.

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