The following corn loci are on one arm of chromosome9 in the order indicated (the distances between themare shown in map units):c-bz-wx-sh-d-centromere12 8 10 20 10C gives colored aleurone; c, white aleurone.Bz gives green leaves; bz, bronze leaves.Wx gives starchy seeds; wx, waxy seeds.Sh gives smooth seeds; sh, shrunken seeds.D gives tall plants; d, dwarf.A plant from a standard stock that is homozygous for allfive recessive alleles is crossed with a wild-type plantfrom Mexico that is homozygous for all five dominantalleles. The F1 plants express all the dominant allelesand, when backcrossed to the recessive parent, give thefollowing progeny phenotypes:colored, green, starchy, smooth, tall 360white, bronze, waxy, shrunk, dwarf 355colored, bronze, waxy, shrunk, dwarf 40white, green, starchy, smooth, tall 46colored, green, starchy, smooth, dwarf 85white, bronze, waxy, shrunk, tall 84colored, bronze, waxy, shrunk, tall 8white, green, starchy, smooth, dwarf 9colored, green, waxy, smooth, tall 7white, bronze, starchy, shrunk, dwarf 6Propose a hypothesis to explain these results. Includea. a general statement of your hypothesis, with diagrams if necessary;b. why there are 10 classes;c. an account of the origin of each class, including itsfrequency; andd. at least one test of your hypothesis.
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
The following corn loci are on one arm of chromosome
9 in the order indicated (the distances between them
are shown in map units):
c-bz-wx-sh-d-centromere
12 8 10 20 10
C gives colored aleurone; c, white aleurone.
Bz gives green leaves; bz, bronze leaves.
Wx gives starchy seeds; wx, waxy seeds.
Sh gives smooth seeds; sh, shrunken seeds.
D gives tall plants; d, dwarf.
A plant from a standard stock that is homozygous for all
five recessive alleles is crossed with a wild-type plant
from Mexico that is homozygous for all five dominant
alleles. The F1 plants express all the dominant alleles
and, when backcrossed to the recessive parent, give the
following progeny
colored, green, starchy, smooth, tall 360
white, bronze, waxy, shrunk, dwarf 355
colored, bronze, waxy, shrunk, dwarf 40
white, green, starchy, smooth, tall 46
colored, green, starchy, smooth, dwarf 85
white, bronze, waxy, shrunk, tall 84
colored, bronze, waxy, shrunk, tall 8
white, green, starchy, smooth, dwarf 9
colored, green, waxy, smooth, tall 7
white, bronze, starchy, shrunk, dwarf 6
Propose a hypothesis to explain these results. Include
a. a general statement of your hypothesis, with diagrams if necessary;
b. why there are 10 classes;
c. an account of the origin of each class, including its
frequency; and
d. at least one test of your hypothesis.
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