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. The number of chromosomes needs to be reduced to n in order to correctly yield a 2n,or diploid, organism during fertilization.

Question 2

Name two ways meiosis contributes to genetic variation.

Answer 2

Two examples are crossing over, and random lining up of chromosomes at equator. Mutations also contribute to genetic variation.

Question 3

Chromosomes are at the poles, two new nuclei are formed around chromosomes. After this phase two cells are formed.

Answer 3

Two cells are formed during telophase 1. Telophase 2 occurs after anaphase 2, where the two cells form daughter cells.

Question 4

How many cells are produced from meiosis?

Answer 4

4 daughter cells are produced as a result of meiosis.It is during meiosis 1 that the two daughter cells split into four daughter cells.

Question 5

When does crossing over occur?

Answer 5

Crossing over occurs only during Prophase 1. During Prophase 2, there are 2 copies of the genes but they are on separate sister chromatids.

Question 6

Which of the following is best represents figure B in this figure?

Answer 6

Sister chromatids are represented in this figure. Chromosomes are part of the DNA of the cell, while chromatids are identical copies of one another.

Question 7

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

Answer 7

Couldn’t see the image.