EXERCISES, LESSON 9
REQUIREMENT. The following exercises are to be answered by completing the
incomplete statements.
After you have completed all the exercises, turn to "Solutions to Exercises" at the
end of the lesson, and check your answers.
1.
Sex hormones belong to a chemical group called
s. Sex hormones are
formed primarily by the
ds and the
l cortex. The sex hormones of the
female are called
s and
e. The sex hormones of the male are
called
s.
2.
Whether an individual will be male or female is determined at the moment the
egg is
d by the sperm. This is determined by the new
c
combination. Substances that later influence the production of sexual organs and
characteristics are the sex
s.
3.
The two kinds of sex chromosomes are
and
.
Within the gonads, there is a special type of cell division known as m
s.
The gametes, formed with this type of cell division, have a (single) (double) set of
chromosomes.
The production of a new individual is based upon the union of two
s,
that is, a s
n and an
m. This process is called f
n.
This produces a zygote with a (single) (double) set of chromosomes. If the zygote has
two X chromosomes (XX), the individual will be a
. If the zygote has one
X and one Y chromosome (XY), the individual will be a
.
4.
During development, the testes "migrate" out of the body cavity, through
the
l canal of the abdominal wall, and into the
. The testes are
generally cooler than the body cavity to ensure production of
e sperm. If
undescended testes remain uncorrected, the male will be
e.
Produced within each testis are millions of
a and a
s.
5.
The secondary sex organs of the male are responsible for the transport and care
of the
a.
As the spermatozoa pass along the length of the epididymis, they are
d by the secretions of the epididymal wall.
MD0007
9-13
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