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A corn breeder is working with 2 inbred corn plants. He is
interested in two traits: High yield (produces lots of corn) and
drought tolerance (does not need lots of water). High yield (H)
is dominant to low yields (h). Drought tolerance (D) is
dominant to drought intolerance (d).
Inbred 1 is true breeding for drought tolerance and low yield
(DDhh). Inbred 2 is true breeding for drought intolerance and
high yield (ddHH).
In the parent cross (P) the corn breeder crossed inbred 1 with
inbred 2. The resulting F,hybrid (DdHh) was heterozygous for
drought tolerance and high yields. Phenotypically all the corn
needs little water to grow and produces lots of corn. This is the
corn that is sold to farmers, planted in the Spring and harvested
in the Fall.
Explain why the farmer does NOT hold back some of the Fall
harvested (F.) kernels and plant them next Spring. You must
show your work. (Hint: As a %, how many of the F2 kernels
still carry the drought tolerant and high yield alleles?

Sagot :

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