Human Development

Question 1

What is oogenesis

Answer 1

Ovum production which begins before birth, accelerates at puberty and ends at menopause

Question 2

What is fertilization

Answer 2

Conception. The fusion of two haploid gametes containing 23 chromosomes each ( fusion of male and female pronuclei )

Question 3

What does fertilization produce?

Answer 3

A zygote containing 46 chromosomes

Question 4

How many sperm reach isthmus

Answer 4

200

Question 5

What is releaSed from the acrosomal cap

Answer 5

hyalouronidase

Question 6

Where does 1 sperm push through

Answer 6

Corona radiata

Question 7

Sperm and oocyte membranes fuse and trigger what?

Answer 7

Activation of oocyte, completing meiosis II

Question 8

Formation of the pronucleus begins and

Answer 8

1. 2nd polar body is formed
2. Metabolic enzymes activated
3. mRNA activation for protein synthesis
4. Sperm is absorbed into cytoplasm
5. Female pronucleus develops

Question 9

Spindle formation and cleavage prep

Answer 9

1. Male pronucleus migrate to the cell
2. Spindle fibers form
3. Mark preparation for first cleavage division

Question 10

Fusion of pronuclei =

Answer 10

Amphimixis

Question 11

Amphimixis =

Answer 11

Conception

Question 12

When does the first cleavage division begin

Answer 12

After conception

Question 13

First cleavage division results in

Answer 13

1. Yields two daughter cells

2. Called blasteomeres

Question 14

The sequence of forming a blastocyst

Answer 14

1. First cleavage division
2. 2 cell stage
3. 4 cell stage
4. Morula
5. Advanced morula
6. Hatching to a blastocyst

Question 15

What happens to the blastocyst

Answer 15

After 6-7 days it attaches itself to the endometrium of the uterus

Question 16

What does the blastocyst consist of?

Answer 16

1. Trophoblast which is the outer layer of cell providing nutrients to embryo
2. Blastocoele
3. Inner cell mass that forms embryo

Question 17

Which side is the inner cell mass side facing

Answer 17

The uterine wall