a race of inbred plant has a mean petal length of 12 mm , a second race from another location has the the same meant petal length .when the two races are crossed , the F 1 also has the meant petal length of 12mm .however the F 2 generation derived from crossing the F 1 to one another shows a very wide spread in plant length.about 3 out of 770 have a length as small as 8mm and about 3 out of 770 have a length of 16mm.how many allelic pairs seem to be involved in the different petal length? how much does each effective allele contribute to the length of petal?
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Explanation:
this phenomenon is call transgressive segregation which our in F2
aabbCCDD X AABBccdd
12 12
AaBbCcDd 12mm F1
aabbccdd...8mm
AABBCCDD 16 mm
recessive genes contribute 1mmwhile dominant genes contribute 2mm
4 pair of alleles are involved
progeny exceed from parents
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