that binds to DNA, often resulted in the appearance of a "drumstick" in
interphase nuclei, but only if the cat was female. Later it was learned that
cells of normal human females also have a "Barr body" and that Triplo X
females have 2 Barr bodies, per cell, Turner's none etc.
condensed, inactive X chromosomes:She also said that:
the same amount of gene products or enzymes coded for by sex-
clotting factor in their blood as XCfYmales.
expression for the gene;
heterozygous for a sex-linked coat color gene. (XBXb). Patches of
condensed and inactive are orange.
parts of the body is seen in human females heterozygous for
anhidrotic ectodermic dysplasia.
number of X and Y chromosomes in any cell.
inactivated during male and female gametogenesis; different regions are
condensed in oogenesis than in spermatogenesis. The inactivated regions
are not expressed in the fetus, so if the normally "active" gene(s) donated
by the other parent is/are defective, an aberrant phenotype may result.
hunger, and thus obesity, the region of Chromosome 15 that is
normally active only in male gametes is missing or non-functional.
In some cases, the child is found to have 2 copies of Chromosome 15
from the mother (both copies inactive) and none from the father
in the egg is defective, resulting in a phenotype often referred to as
normal gene is only expressed in one sex, and the effect does not
always persist to adulthood.
one sex. This does not mean that the genes are necessarily located on the
X or Y chromosomes or that the genes are not present in the other sex. A
good example is lactation, which is limited to females. However, as any
dairy farmer knows, daughters of "good bulls" give more milk.
be sex influenced.
humans are all good examples.
the phenotype to describe the mode of inheritance. Note the difference in
heterozygous males and females in the example below:
again, the genes could be on any chromosome.