Two alleles at one locus produce three distinctphenotypes. Two alleles of two genes lead tofive distinct phenotypes. Two alleles of six geneslead to 13 distinct phenotypes. (These statementsassume that the alleles at any one locus arecodominant or incompletely dominant andthat each gene makes an equal contributionto the phenotype.)a. Derive a formula to express this relationship. (Letn equal the number of genes.)b. Each of the most extreme phenotypes for a traitdetermined by two alleles at one locus are foundin a proportion of 1/4 in the F2 generation. If twoalleles of two genes determine the trait, each extreme phenotype will be present in the F2 as 1/16of the population.In common wheat (Triticum aestivum),kernel color varies from red to white andthe genes controlling the color act additively,that is, alleles for each gene are incompletelydominant and each gene contributes equallyto the color. A true-breeding red variety iscrossed to a true-breeding white variety, and1/256 of the F2 have red kernels and 1/256 havewhite kernels. How many genes control kernelcolor in this cross?
Two alleles at one locus produce three distinct
five distinct phenotypes. Two alleles of six genes
lead to 13 distinct phenotypes. (These statements
assume that the alleles at any one locus are
codominant or incompletely dominant and
that each gene makes an equal contribution
to the phenotype.)
a. Derive a formula to express this relationship. (Let
n equal the number of genes.)
b. Each of the most extreme phenotypes for a trait
determined by two alleles at one locus are found
in a proportion of 1/4 in the F2 generation. If two
alleles of two genes determine the trait, each extreme phenotype will be present in the F2 as 1/16
of the population.
In common wheat (Triticum aestivum),
kernel color varies from red to white and
the genes controlling the color act additively,
that is, alleles for each gene are incompletely
dominant and each gene contributes equally
to the color. A true-breeding red variety is
crossed to a true-breeding white variety, and
1/256 of the F2 have red kernels and 1/256 have
white kernels. How many genes control kernel
color in this cross?
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