Grain colour in wheat is determined by three pairs of polygene. Following the cross $AABBCC(dark\ colour) imes aabbcc(light\ colour)$ , in $F_{2}$ generation. What proportion of the progeny is likely to resemble either parent?

Question

Grain colour in wheat is determined by three pairs of polygene. Following the cross $AABBCC(dark\ colour) 	imes aabbcc(light\ colour)$ , in $F_{2}$ generation. What proportion of the progeny is likely to resemble either parent?

Dr. Abubacker · Accepted Answer

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 $F_{2}$-generation seven phenotypes will obtain with ratio 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 $F_{2}$-generation would be 3.12, i.e., less than 5%

Q. Grain colour in wheat is determined by three pairs of polygene. Following the cross $AABBCC(dark\ colour) \times aabbcc(light\ colour)$ , in $F_{2}$ generation. What proportion of the progeny is likely to resemble either parent?

Explanation

Reviewed by Dr. Abubacker

Want more practice?