In the late 1920s, a mutation occurred in many silver fox farms around the world
ID: 179006 • Letter: I
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, most pure 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 ® 2 platinum for each silver offspring. Explain.
Explanation / Answer
Assuming that the gene coding for silver coat is "a" and the gene coding for platinum coat is "A;" and A is dominant over A. Also assume that homozygous dominant genotype (AA) is lethal.
(a). Cross between silver* silver = aa*aa ----> 100% silver
(b). Cross between silver* platinum = aa*Aa ----> Aa (50% platinum), aa (50% silver)
(b). Cross between platinum* platinum = Aa*Aa ----> AA (25%, lethal), Aa (50% platinum), aa (25% silver). Means, 2:1 ratio of platinum to silver.
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