Grain colour in wheat is determined by three pairs of polygenes. Following the cross A A B B C C (dark colour) X aabbcc (light colour),
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LESS THAN 5%
Polygene results in quantitative inheritance which is characterized by occurrence of intermediate forms between the parental type. In case of crossing between AABBCC (dark colour) and aabbcc (light colour), in F2 generation seven phenotypes will obtain with ratio of 1 : 6 : 15 : 20 : 15 : 6 : 1. The total number of progeny is 64, out of which only two will be likely resemble with either parents. Hence, their proportion in F2 generation would be 3.12 ie, less than 5%.
Polygene results in quantitative inheritance which is characterized by occurrence of intermediate forms between the parental type. In case of crossing between AABBCC (dark colour) and aabbcc (light colour), in F2 generation seven phenotypes will obtain with ratio of 1 : 6 : 15 : 20 : 15 : 6 : 1. The total number of progeny is 64, out of which only two will be likely resemble with either parents. Hence, their proportion in F2 generation would be 3.12 ie, less than 5%.
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Grain colour in wheat
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Polygene results in quantitative inheritance. Quantitative inheritance is characterised by the occurrence of intermediate forms between the parental type. There will be 7 (1 : 6 : 15 : 20 : 15 : 6 : 1) phenotypes when three polygene pairs are involved. The total number of progeny would be 64. Out of these 64, only 2 will be likely to resemble either parents. Hence their proportion in F2 generation would be 3.12%, which is less than 5%.
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