Sex Chromosomes Flashcards

1
Q

What are the female sex chromosomes?

A

They are identical; they are both X chromosomes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the male sex chromosomes?

A

They are different; there is an X & a Y chromosome (the Y chromosome is much shorter than the X chromosome.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the differences between the sperm and the egg?

A

Half the sperm carries an X chromosome and half a Y chromosome. Whereas all the eggs carry X chromosomes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How a boy or a girl is produced?

A

If an X sperm fertilises the egg, a girl is produced.

If a Y sperm fertilises the egg, a boy is produced.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How is the sex of an individual determined?

A

It is determined by a gene on the Y chromosome called the sex-determining region Y (SRY) gene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What happens if the SRY gene isn’t present?

A

There will be two X chromosomes present and the embryo will develop into a female.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What happens if the SRY gene is present?

A

Then a Y chromosome and an X chromosome are present and testes begin to develop

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What happens 6 weeks into fertilisation if the SRY gene was present?

A

The testes that developed start producing a hormone called androgen. Specialised receptors in the developing embryo detect the androgen and male reproductive organs begin to grow.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What happens when the Y Chromosome is present but the androgen isn’t detected?

A

The embryo develops female sex organs apart from the uterus which means the baby has a female body but is infertile.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly