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Flashcards in Cell Division Deck (14)
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1

What is an autosome

A non-sex chromosome

2

How many chromosomes are there in a normal somatic cell?

46 (22 pairs of autosomes and 2 sex chromosomes)

3

What is mitosis?

Diploid 2N cell replicates it’s DNA to form a diploid 4N cell and divides to form two identical 2N daughter cells

4

What is meiosis?

Diploid 2N cell replicates it’s DNA to form a 4N diploid cell which undergoes two cell divisions (meiosis 1 and 2) to form 4 haploid 1N cells (gamete)

5

In males, how many spermatozoa are produced from meiosis of 1 germ cell?

4 spermatozoa (4 haploid cells)

6

In females, how many oocytes are yielded from a single germ cell?

1 haploid oocyte with 3 non functional, small haploid polar bodies

7

What are the phases of interphase?

G1, synthesis, G2

8

What are the phases of m phase?

Mitosis and cytokenesis

9

What are the phases of mitosis?

Prophase, métaphase, anaphase, telophase

10

What happens in prophase?

Chromosomes condense, nuclear envelop dissolves, miroirs spindle fibers form

11

What happens in metaphase?

Chromosomes align at the equator of the cell

12

What happens in anaphase?

The chromosomes split to opposite poles of the cell

13

What happens in telophase?

Last phase of mitosis, the nuclear envelope forms around the chromosomes in preparation for cytokenesis

14

What happens in prophase 1?

Chromosomes condense and pair (leptotene), synapsis of chromosomes (zygotene) gene swapping (patchytene) meisosis arrests until puberty in women (diplotene) and continues after puberty forming the spindle fibres required for metaphase (diakenesis)