Genetics Test 1 Week 2

4. In meiosis II, ___________________ (homologous chromosomes/ sister chromatids) separate into four daughter cells.

/ sister chromatids

A cell with a total number of 24 chromosomes undergoes meiosis, how many chromosomes are in each daughter cell?

12

15. If a diploid cell containing 28 chromosomes undergoes meiosis, how many chromosomes will each daughter cell have?

14

9. How many divisions are there in meiosis?

2

DNA replication results in:

2 DNA molecules that each contain a strand of the original

If a DNA molecule is found to be composed of 30% thymine, what percentage of guanine would be expected.

20%

__ sets of chromosomes in ovum and sperm unite during fertilization, forming a diploid single-celled zygote.

23

A human cell has 23 pairs of chromosomes. Following mitosis, the daughter cells would each have a total of ______ chromosomes. After meiosis I, the two daughter cells would have _____chromosomes, and after meiosis II ______ chromosomes.

46, 23, 23

Thymine binds with

Adenine

What is the correct chromosomal condition at the early stage of metaphase of mitosis?

B

Which of the following must happen first in order for DNA replication to occur?

DNA is unwound

The name of the enzyme that joins the okazaki fragments is

DNA ligase

Tetrads form during prophase II of meiosis.

FAlse

DNA has left handed double helix.

False

DNA replication occurs only before mitosis.

False

Upon completion of telophase I and cytokinesis, there are two diploid daughter cells.

False

1. Gametes are made through the process of mitosis or meiosis?

Meiosis

During meiosis, chromosomes assort themselves independently of each other, which allows for more different possible combinations of chromosomes.

True

14. Describe the similarities and the difference between meiosis I and meiosis II.

a. In Meiosi 1, homologous chormosomes separate, while in meiosis 2 sister chromatids separate. b. Meiosis II produces 4 haploid daughter cell, wehera Meiosis II, sister chromatids separate. c. Genetic recombination (crossing over happens in meiosis I.

12. Compare the number and type of cells that result from meiosis vs. mitosis.

a. Meiosis: four daughter cells that are haploid b. Mitosis: two identical cells that are diploid

8. What happens in crossing over?

a. Mixing of genetic information between chromosome pairs. Happens during prophase 1.

13. How do the genetic contents of cells resulting from mitosis and meiosis differ?

a. The genetic contents of a cell created in mitosis are identical to the original cell. b. In Meiosis the homologous pairs attached to the other resulting in a different daughter cell each time.

2. What are homologous chromosomes?

a. Two chromosomes with the same gene sequence.

Which of the following is required for DNA replication to occur?

all of the above

The stage of meiosis where cells become haploid.

anaphase I

All of the following occur during early stage of metaphase of mitosis in animal cells except

chromosomes replicate.

3. At the end of meiosis I, __________________ (homologous chromosomes/ sister chromatids) separate into two new daughter cells.

homologous chromosomes/

Okazaki fragments form on the:

lagging strand

5. In __________ (meiosis I /meiosis II) the cells become haploid.

meiosis II

Spindle apparatus is made out of a type of cytoskeletal protein called ___________ that contain ___________ monomers.

microtubules, tubulins

Crossing over usually contributes to genetic variation by exchanging chromosomal segments between

nonsister chromatids of homologues.

7. In prophase I phase of meiosis, crossing over takes place.

prophase I

Independent assortment of chromosomes is a result of

the random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I.