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594 Chapter 17 NEL

10. Select the number of chromosomes that would be in each
    blastula cell, following mitosis.
    A. 20
    B. 22
    C. 23
    D. 45


11. Indicate which of the following cells would be capable of
    meiosis:
    A. brain cells
    B. fat cells
    C. cells of a zygote
    D. sperm-producing cells of the testes

Part 2

12. Figure 4shows plant and animal cells during cell division.
    (a) Identifyeach cell as either a plant or an animal cell.
    Justifyyour answer.
    (b) Identifythe phases of cell division.

8.Select the number of chromosomes that were in the sperm

cell.

A. 20

B. 22

C. 23

D. 45

9. Select the number of homologous pairs of chromosomes
   that would be in the zygote if it were female.
   A. 21
   B. 22
   C. 23
   D. 24

Number of Days

Number of Cells

(a)

Number of Days

Number of Cells

(b)

Number of Days

Number of Cells

(c)

Number of Days

Number of Cells

(d)

Figure 2

Use the following information to answer questions 8 to 10.

Figure 3shows the early events in fertilization of a human egg

and sperm, and development of the embryo. The numbers

refer to the number of chromosomes.

23

45

sperm zygote

mitosis

Figure 3

Figure 4

ABCD

Growth Rate of

Malignant Cells

Growth Rate of

Malignant Cells

Growth Rate of

Malignant Cells

Growth Rate of

Malignant Cells

13. Explainwhy a better understanding of the mechanism of
    cell division may enable scientists to regenerate limbs.

14 .Explainwhy the formation of calluses on the hands

provides evidence that cell division can be stimulated

by cell damage.

15. Explainhow it is possible to produce a trisomic XXX
    female.


16. Sketcha diagram that shows the kind of nondisjunction
    that would cause a male and female each with an
    abnormal number of chromosomes to produce an XYY
    offspring.


17. If nondisjunction disorders could be eliminated by
    screening sperm and egg cells, sperm and egg banks
    could all but eliminate many genetic disorders. Describe
    the social, moral, and ethical implications to society of the
    systematic elimination of genetic disorders in humans.