Exam/Quiz Corrections

Question 1

Why must sex cells first undergo meiosis before fertilization?

Answer 1

To create haploid gametes that will be used in fertilization; need to reduce the number of chromosomes to n in order to correctly yield a 2n (diploid) organism during fertilization, if not problems may occur.

Question 2

Discuss two ways meiosis contributes to genetic variation.

Answer 2

Crossing over; random lining up of chromosomes at equator.

Question 3

Although mitosis and meiosis both involve cell division, they transmit genetic material in very different ways. What happens when either of these processes goes awry?

Answer 3

Cancer; mutations.

Question 4

Number 2. I chose C-Somatic Cell Division

Answer 4

Correct answer is D- Meiotic cell division

Question 5

Number 3. I chose B-20%

Answer 5

Correct answer is D-100%

Question 6

Number 4. I chose A-It produces haploid cells

Answer 6

Correct answer is C-It contains only one cell division

Question 7

Number 5. I chose A-Once anaphase 1 of meiosis 1 is complete

Answer 7

Correct answer is C-Once telophase 1 of meiosis 1 is complete

Question 8

Number 6. I chose C-Separation of sister chromatids

Answer 8

Correct answer is B- Addition of sister chromatids

Question 9

Number 7. I chose C-Genetics

Answer 9

Correct answer is B-Non recombined chromatids

Question 10

Number 10. I chose A-Interphase

Answer 10

Correct answer is B-Prophase

Question 11

Number 11. I chose B-Prophase

Answer 11

Correct answer is B

Question 12

Number 12. I chose A-Interphase

Answer 12

Correct answer is A

Question 13

Number 13. I chose B-Prophase

Answer 13

Correct answer is B

Question 14

Number 14. I chose A-Interphase

Answer 14

Correct answer is A

Question 15

Number 15. I chose B-Prophase

Answer 15

Correct answer is B

Question 16

Sister chromatids are at the poles, 4 new nuclei form around them. After this phase 4 haploid daughter cells are formed.

Answer 16

Telophase II

Question 17

Chromosomes line up on equator of the cell

Answer 17

Metaphase II

Question 18

When does crossing over occur?

Answer 18

Prophase I

Question 19

How many chromosomes are in a human zygote?

Answer 19

46

Question 20

Which of the following best represents the black lines in this figure?

Answer 20

spindle fibers

Question 21

Name the yellow structures in the following image:

Answer 21

centrioles

Question 22

During which stage do the cells below have only one allele for each gene?

Answer 22

G

Question 23

Suppose a new organism is discovered in Arkansas in 2019. The scientist determined that the haploid number is represented with by the total chromosomes shown below. Which of the following best represents the diploid number of the organism?

Answer 23

6

Question 24

Phenotype:

Answer 24

brown eyes

Question 25

Suppose you are trying to predict the offspring of two plants, knowing that they are both heterozygous. What percentage of the offspring will be homozygous dominant?

Answer 25

25%

Question 26

Dr. Walther Fleming observed spermatozoa undergoing cell division in 1882. Observation, followed in 1902 by Sutton's meticulous measurement of chromosomes in grasshopper sperm cell development, provided definitive clues that the number of chromosomes was reduced in spermatozoan cell division, a process known as reductive division. Which of the following was Dr. Fleming most likely studying?

Answer 26

Meiotic cell division

Question 27

Suppose you were conducting an experiment using four different cell lines and after careful observation, you conclude that three out of the four cell lines reproduce resulting in haploid cells while one cell line yields cells with 2n chromosomes. What percentage of the cell lines you are investigating conduct mitosis?

Answer 27

25%

Question 28

The building blocks of DNA are called:

Answer 28

nuleotides