question archive The height of the seed head in wheat at maturity is determined by several genes
The height of the seed head in wheat at maturity is determined by several genes
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The height of the seed head in wheat at maturity is determined by several genes. In one variety, the head is just 9 inches above the ground; in another, it is 33 inches above the ground. Plants from the 9-inch variety were crossed to plants from the 33-inch variety. Among the F1, the seed head was 21 inches above the ground. After self-fertilization, the F1 plants produced an F2 population in which 9-inch and 33-inch plants each appeared with a frequency of 1/256. (c) If a 21-inch F1 plant were crossed to a 9-inch plant, how often would you expect 18-inch wheat to occur in the progeny?
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Answer:
4 genes are involved in the see height as 21,33,18,9 inches hights are 4 different phenotypes
each allele say contribute 3 inches for the height of the allele
AAbbccdd X AABBCCDD A,B,C,D each allele contribute to 3 inches a,b,c,d are recessive no height contributiion
Abcd XABCD
AAbBcCdD F1= 18 inches
AAbBcCdD XAAbBcCdD
has resulted in 9,33,inches plants
so 21 inch plant has genotype as
AABBcCdD X AAbbccdd
ABcd XAbcd -->AABbccdd
ABCDX Abcd ---> AABbCcDd 18 inches plant( 1/4 is the probability of occuring out of possiblre 4 progeny)
ABCd X Abcd ----> AABbCcdd
ABcD X Abcd
hH X hh
h H
h hh hH
h hh Hh
ANS: (a) 4; (b) 3 inches; (c) frequency of 1/4
