Unit 2-Lesson 3

Question 1

Where do Meiosis take place in?

Answer 1

Meiosis takes place in testes and ovaries (haploid sperm and egg cells respectively are produced)

Question 2

What is gametogenesis?

Answer 2

Formation of sex cells during meiosis referred to as gametogenesis

Question 3

What are the steps of Oogenesis?

Answer 3

1. Begins with a diploid cell called an oogonium
2. Cytoplasm of female gametes doesn’t divide equally after nuclear division
3. One daughter receives most of the cytoplasm after the division. That cell continues through meiosis I and II to form one viable egg. This cell contains a large quantity of nutrients that will support a zygote after fertilization

Question 4

What are the steps of Spermatogenesis?

Answer 4

1. Begins with diploid cell called spermatogonium
2. Equal division of cytoplasm with sperm
3. 4 cells produced via meiosis

Question 5

What are the ways for genetic variation?

Answer 5

Crossing over: will occur during Prophase I
Independent Assortment: occurs in Metaphase I and Metaphase II

Question 6

What is crossing over and when does it occur during meiosis?

Answer 6

• In prophase I, non-sister chromatids can exchange pieces of chromosomes
• As a result, individual chromosomes can contain genes of maternal origin and some genes of paternal origin

Question 7

How does crossing over help with genetic variation?

Answer 7

Increases genetic diversity of the gametes produces

Question 8

What is Independent Assortment and when does it occur during meiosis?

Answer 8

• In metaphase I, homologous chromosomes line up in the middle cell
• Depending how the homologous chromosomes line up, a number of different combinations of chromosomes may be found in the gametes