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NEL Cell Division 595

18. Copy Table 2into your notebook, determinethe missing
    values, and complete the table. To calculate the time spent
    in interphase, for example, you would use the following
    equation:

Number of cells in interphase

=

Time spent in phase

Total number of cells counted Total time of cycle (660 min)

19. Using the data provided, sketcha circle graph showing
    the amount of time spent in each phase of the cell cycle.

20.Identifyone advantage of using a cutting instead of using

seeds to grow a new plant.

Chapter 17

Table 2

Total cell Time spent

Cell phase Area 1 Area 2 count in phase

interphase 91 70??

prophase 10 14??

metaphase 2 1??

anaphase 2 1??

telophase 4 4??

26.Twins can be either identical or fraternal. Write a unified

response that includes the following aspects of twins:

• Copy Table 3in your notebook. Identifywith a check
  mark (✓) the statements that you believe are always, or
  almost always, true for fraternal twins and for identical
  twins.


• Justifyeach choice.

female A male B female C

zygote D zygote E

zygote F

chromosome

number

process X

8

35

8 8

44 44 44 44

meiosis

Figure 5

Table 3

Fraternal Identical

Descriptor twins twins

They have the same blood type.??

They are the same sex.??

They like the same hockey team.??

They have the same mass.??

They have the same hair colour.??

They know what the other one??

is thinking.

Use the following information to answer questions 18 and 19.

Table 2shows data collected from two different fields

of view while examining hamster embryo cells. The number of

cells found in each of the cell phases was recorded. It took

660 min to complete one cycle from interphase to interphase.

Use the following information to answer questions 21 to 25.

Fruit flies normally have eight chromosomes. Flies with fewer

chromosomes die before maturity. Figure 5shows the process

of meiosis in three fruit flies.

21.Identifythe parent in which nondisjunction takes place.

22.Identifyhow many chromosomes would be in zygotes D,

E, and F.

23.Describewhat is happening during process X.

24.Identifywhich zygote would most likely be healthy.

25.Identifyby name the conditions that the other zygotes

have.

DE

DE

DE

DE

DE

DE

DE

DE