4.6 Pregnancy

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

One + one = three

Benodigheden

- iPad

- Pen, pencil

- note bokk

- binder

For a mark

- No

Lessonup

- Yes

Bags

in bag closet

Phones 

in phone closet

today''s program 

review par. 4.5, homework check

learning objectives:

• what is cleavage and where does it take place?
• what is implantation and why is this process needed for a healthy embryo to form?
• what structures are there to nourish and support the developing foetus? 

how to answer 'explain' questions 

-> the question is most of the time : cause-->effect 

-> the answer is based on facts that needs be combined in order to come to a conclusion

cause = facts

effect= conclusion (=confirmation of the question) 

3. Why is it sufficient for only the head of the sperm cell to enter the egg cell?

--> Facts: 

Fertilisation is the fusion of the nuclei of sperm and egg cell

The head of the sperm cell contains the nucleus

Explanation? 

--> Conclusion:

It is sufficient for only the head of the sperm cell to enter the egg cell 

3. Why is it sufficient for only the head of the sperm cell to enter the egg cell?

--> Facts: 

Fertilisation is the fusion of the nuclei of sperm and egg cell

Fertilisation is the fusion of hereditary information from both parents 

The head of the sperm cell contains the nucleus

Explanation: 

In order to combine the hereditary information of both parents the fusion of the nuclei of the egg and sperm cell is necessary. As the nucleus of the sperm cell is in the head, no other parts of the sperm cell need to enter the egg cell

--> Conclusion:

It is sufficient for only the head of the sperm cell to enter the egg cell 

4. Explain why you have inherited characteristics from both your parents.
a. What facts are important to answer the question?
b. What 's the conclusion hidden in the question?

4. Explain why you have inherited characteristics from both your parents.

5. Do you think that the nuclei are also copied during the zygote’s cell divisions? Explain how you came up with your answer.
a. What are the facts? b. What's the conclusion?

5. Do you think that the nuclei are also copied during the zygote’s cell divisions? Explain how you came up with your answer.

today''s program 

review par. 4.5, homework check

learning objectives:

• what is cleavage and where does it take place?
• what is implantation and why is this process needed for a healthy embryo to form?
• what structures are there to nourish and support the developing foetus? 

what and where is cleavage? 

5-10 days after fertilisation there is the implantation of the embryo; 

on what day number? 

zygote -> morula-> blastocyst -> embryo

what is cleavage?
(choose the best answer)

1. cell divisions during which the zygote grows into a tiny hollow ball of cells
2. cell divisions of the zygote in the oviduct until implantation
3. cell division during which the embryo grows into the first foetal stage
4. cell divisions during which the zygote grows into an foetus

implantation 

The process of the embryo attaching to and implanting into the endometrium.

different stages - different names 

zygote = fertilised egg

embryo =  after cleavages, at implantation 

foetus = 10 weeks of pregnancy, the beginning of all organs are present. From now these only have to grow and develop. 

huiswerk

lrn par 4.6 

do exercises 1-4 of par. 4.6

One + one = three

Benodigheden

- iPad

- Pen, pencil

- note bokk

- binder

For a mark

- No

Lessonup

- Yes

Bags

in bag closet

Phones 

in phone closet

today''s program 

Learning objectives:  you are able to 

• describe foetal development
• explain two types of prenatal diagnosis 

After .... weeks of pregnancy the embryo is called foetus

1. 8
2. 9
3. 10

Pregnany lasts for ... weeks after fertilisation

1. 38
2. 39
3. 40
4. 41

The earliest moment a neonatal can be given birth to is after ... weeks of pregnancy

1. 23
2. 24
3. 25
4. 26

It can't be be born earlier because ...

1. The lungs are underdeveloped so it cannot breath
2. The heart can't beat by itself
3. The neonatal does not have teeth in order to eat
4. the mother cannot breast feed the neonatal

the placenta belongs to ..

1. the mother
2. the foetus
3. both mother and foetus

synonym to foetal diagnosis is ...

1. postnatal check
2. postnatal screening
3. prenatal screening
4. prenatal check

homework

lrn par. 4.6 Pregnancy

finish exercises 1-7 

read par. 4.7Childbirth

exit ticket  

what did you learn about foetal development?

how could prenatal screening help to detect an unborn with Down's  Syndrom?