EXERCISES, LESSON 14
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.
Heredity depends upon the passage of materials called
s from one
generation to the next. Due to genes, all human beings
ble each other but
also have individual
ces.
Overall, genes determine the range of
ality of an individual, and the
t develops it. For example, good nutrition will help a person to attain his
full body height and weight within the limitations determined by his
s.
2.
DNA is a large molecule consisting of two strands in a double-
arrangement.
Along each strand are specific chemical elements call n
s. Each gene consists
of a portion of a strand including a number of
s. Through the arrangement of
its nucleotides, the
e provides coded information for the construction of
s.
As these proteins are assembled, they serve as building blocks and as e
s to
promote the life
s of the cell.
3.
A chromosome is a very long double-helix thread of
. Thus, each
chromosome consists of a large number of
s. The genes have very specific
locations along the length of each
.
4.
The usual process of cell division is called
osis. This is the means of
producing new cells for
ment of worn-out cells and g
h and d
t
of the individual. The two daughter cells have (23) (46) chromosomes.
5.
Meiosis is a type of cell division occurring only in the
s. It results in the
formation of the
s, or sex
s. Each gamete has (23) (46) chromosomes.
6.
The zygote has (23) (46) chromosomes.
7.
The actual genetic makeup of an individual is the
type. The physical and
functional makeup of an individual is the
type, determined both by the
type
and the
t.
MD0007
14-10