. In common wheat, Triticum aestivum, kernel color is determined by multiply duplicated genes, each with an Rand an r allele. Any number of R alleles will give red, anda complete lack of R alleles will give the white phenotype.In one cross between a red pure line and a white pureline, the F2 was 6463 red and 641 white.a. How many R genes are segregating in this system?b. Show the genotypes of the parents, the F1, and the F2.c. Different F2 plants are backcrossed with the whiteparent. Give examples of genotypes that would give thefollowing progeny ratios in such backcrosses: (1) 1 red :1 white, (2) 3 red :1 white, (3) 7 red :1 white.d. What is the formula that generally relates thenumber of segregating genes to the proportion of redindividuals in the F2 in such systems?
. In common wheat, Triticum aestivum, kernel color is determined by multiply duplicated genes, each with an R
and an r allele. Any number of R alleles will give red, and
a complete lack of R alleles will give the white
In one cross between a red pure line and a white pure
line, the F2 was 64
63 red and 64
1 white.
a. How many R genes are segregating in this system?
b. Show the genotypes of the parents, the F1, and the F2.
c. Different F2 plants are backcrossed with the white
parent. Give examples of genotypes that would give the
following progeny ratios in such backcrosses: (1) 1 red :
1 white, (2) 3 red :1 white, (3) 7 red :1 white.
d. What is the formula that generally relates the
number of segregating genes to the proportion of red
individuals in the F2 in such systems?
The genes in the DNA code for a specific trait. Each gene has two alternative forms called alleles which determine the dominant and recessive form of the trait-like if the trait is for height then the alleles will be dominant, T, determines tallness, while the recessive allele, t, determines dwarfness.
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