Question

Solve these 10 questions

11.Fill in the blanks. Suppose a cell at the end of S-phase has 48 chromatids. At the end of mitosis, each cell produced would have ______ chromosomes and ______ chromatids.

48, 96

24, 12

48, 48

24, 24

24, 48

12.Fill in the blanks. Suppose a cell at the beginning of meiosis has 36 chromosomes. This cell has ________ chromatids. At the end of meiosis, each of its "daughter cells" will have _________ chromosomes.

72, 18

72, 36

36, 18

36, 36

18, 18

13.Fill in the blanks. Suppose a cell at the beginning of meiosis has 30 chromosomes. This cell has ________ chromatids. At the end of meiosis, each of its "daughter cells" will have _________ chromosomes.

30, 15

15, 15

30, 30

60, 15

60, 30

14.Which of the following happens commonly in BOTH mitosis and meiosis?

chromosome number stays the same from start to finish

non-sister chromatids exchange segments during "crossing over"

sister chromatids are separated

homologous chromosomes are separated

paternal vs. maternal chromosomes assort independently into gametes

15.Suppose you are examining a cell under a very powerful microscope. The cell has multiple chromosomes. You can see the chromosomes and you notice that the chromosomes are lined up two-by-two in a line across the middle of the cell. Which of the following is most likely FALSE about this cell?

It is diploid

This cell is going to divide very soon

It is in the process of mitosis

DNA has been replicated, but copies have not yet been separated

It is in the process of meiosis

16.Suppose a cell in G2-phase has 12 chromatids. How many double-stranded DNA molecules does it have?

12

6

48

24

96

17.Which of the following is NOT a universal feature of the life cycles of sexually reproducing organisms?

Mitosis can only happen in the diploid life stage

The product of fertilization is a diploid cell called a zygote

Meiosis is the transition from the diploid life stage to the haploid life stage

The products of meiosis are haploid cells called gametes or spores

Fertilization is the transition from the haploid life stage to the diploid life stage

18.Horses have 64 chromosomes per diploid cell. When horse parents have horse babies (foals) via sexual reproduction, those babies also have 64 chromosomes per diploid cell. How is this possible?

Fertilization makes a horse zygote with 128 chromosomes, and then meiosis makes the first four horse cells having 64 chromosomes each

Meiosis makes horse gametes with 32 chromosomes each, and then fertilization makes a horse zygote with 64 chromosomes

Horse cells can tell when they have too many or too few chromosomes, and they selectively make or eliminate chromosomes as necessary

Fertilization makes a horse zygote with 128 chromosomes, but then independent assortment makes half those chromosomes disappear

Fertilization makes a horse zygote with 128 chromosomes, and then the 64 dominant chromosomes eliminate the 64 recessive chromosomes

19.Great white sharks reproduce sexually and have 82 chromosomes per diploid cell. How many of a great white shark's chromosomes were inherited from one of its parents?

0

82

41

it could be any number between 0 and 82 because of independent assortment

it could be any number between 0 and 82 because of random fertilization

20.Suppose a diploid cell has 4 chromosomes. Due to independent assortment, how many distinct combinations of chromosomes are possible in gametes that might be formed from this cell? (Hint: remember the 2-to-the-nth-power rule.)

16

2

4

32

8

Answer 1

11.Suppose a cell at the end of S-phase has 48 chromatids. At the end of mitosis, each cell produced would have ____48__ chromosomes and __48____ chromatids.

12.Suppose a cell at the beginning of meiosis has 36 chromosomes. This cell has ____72____ chromatids. At the end of meiosis, each of its "daughter cells" will have ______18___ chromosomes.

13.Suppose a cell at the beginning of meiosis has 30 chromosomes. This cell has ___60_____ chromatids. At the end of meiosis, each of its "daughter cells" will have _____15____ chromosomes.

14."Sister chromatids are separated" both in mitosia and meiosis.

15.It is in the process of mitosis.

16. 24 double-stranded DNA molecules it have.

17.Mitosis can only happen in the diploid life stage.

18.Meiosis makes horse gametes with 32 chromosomes each, and then fertilization makes a horse zygote with 64 chromosomes

19. 41 of a great white shark's chromosomes were inherited from one of its parents.

20. 2⁴ = 16. Hence 16 distinct combinations of chromosomes are possible in gametes that might be formed from this cell.