Human-embryonic-development

Question 1

The sperm and the egg are called

Answer 1

Gametes

Question 2

Forming a 46 chromosomes cell called

Answer 2

Zygote

Question 3

The zygote starts to divide and multiply

Answer 3

Fertilization

Question 4

They each contain half on the genetic information necessary for reproduction

Answer 4

Fertilization

Question 5

Carrying of the embryo inside the uterus which can last up to 9 months in human

Answer 5

Gestation

Question 6

The fertilized egg passes along the fallopian tube

Answer 6

Zygote

Question 7

Within 24-36 hours it has divided into two cells, than 12 hours later into four cells

Answer 7

Zygote

Question 8

Known as cleavage

Answer 8

Zygote

Question 9

Conveys zygote towards uterus

Answer 9

Fallopian tube

Question 10

The large zygote splits itself into two cells

Answer 10

First cleavage

Question 11

Micro hair in the fallopian lining that waft the zygote along

Answer 11

Cilia

Question 12

Secrete fluid that fill the fallopia

Answer 12

Goblets cells

Question 13

The zygote divides several times to form a solid blackberry-like cluster of 16-3 cells, the ______ (derived from the latin for “mulberry”)

Answer 13

Morula

Question 14

At around ____ days after fertilization the morula leaves the fallopian tube and enters the urine cavity.

Answer 14

3-4 days

Question 15

About ____ days after fertilization, the cell cluster forms a hollow cavity and is known as a _____

Answer 15

6days

Blastocyst

Question 16

It floats within the uterus for around 48hours before landing on the thick uterus lining (endometrium), which softens to aid implantation

Answer 16

Blastocyst

Question 17

The inner ___ __ ____ wil become the embryo itself

Answer 17

Inner group of cells

Question 18

At day __ after conception, the cells that will form the embryo become an ______ ___.

Answer 18

Embryonic disc

Question 19

The ___ __, on one side of the disc, will become part of the digestive tract.

Answer 19

Yolk sac

Question 20

Fills with liquid and will surround the embryo as it develops

Answer 20

Amnion

Question 21

The cells in the blastula rearrange themselves spatially to form three layers of cells. This process is called?

Answer 21

Gastrulation

Question 22

Each of these layers if called ___ layer and each ___ layer differentiates into different organ systems

Answer 22

Germ layer

Question 23

The earliest recognizable precursors of games.

Answer 23

Primordial germ cells

Question 24

First become readily recognizable at 24days after fertilization in a layer of the yolk sac

Answer 24

Human primordial germ cells

Question 25

Exit from the yolk sac into the hindgut tissue and then migrate until they reach the location of the sex organs

Answer 25

Germ cells

Question 26

Is the phase of embryonic development that starts at the end of gastrulation and continues until birth.

Answer 26

Organogenesis

Question 27

As development proceeds, cells continue to divide.

Answer 27

Growing embryo

Question 28

By the end of the embryonic stage, eight weeks after fertilization, all major organs and body parts are___
At this stage, the baby is known as fetus.

Answer 28

Formed (growing embryo)

Question 29

If the chromosomes pair is XY, the gonads develop into testes starting in week _?

Answer 29

7

Question 30

If the chromosomes pair is XX, the gonads become ovaries starting in week_?

Answer 30

8

Question 31

Testes secrete testosterone, forming make genitalia around week _?

Answer 31

10

Question 32

Without testosterone, ____ genitalia form.

Answer 32

Female

Question 33

The embryo is about ___ inch long?

Answer 33

1/5

Question 34

Four chambered heart beats, sending blood through simple vessels

Answer 34

Four weeks

Question 35

At this stage, the face and neck take shape l, the back straightens, and fingers and toes can be differentiated clearly.

Answer 35

8 weeks

Question 36

The embryo starts to move

Answer 36

8 weeks

Question 37

It is now around 1 - 1-1/5 inch length

Answer 37

8 weeks

Question 38

The embryo has a distinct head and tail and a beating heart

Answer 38

By week 4

Question 39

By ___ weeks, the fetus has a large head compared with the rest of its body

Answer 39

12