B6: X And Y Chromosomes Flashcards
1
Q
Which chromosomes decide whether you turn out male or female?
A
Out of the 23 pairs of chromosomes in every human cell, 22 control characteristics. The 23rd pair are labelled XY or XX - they determine your sex.
2
Q
What chromosomes do males have?
A
An X and Y chromosomes : XY
The Y chromosome causes male characteristics.
3
Q
What chromosomes do females have?
A
Two X chromosomes: XX
The XX combination allows female characteristics to develop.
4
Q
What’s the chance each sperm cell gets an X-chromosome or a Y-chromosome?
A
It’s a 50:50 chance.
5
Q
What chromosomes do eggs have?
A
It’s similar to sperm cells. But the original cell has two X-chromosomes, so all the eggs have one C-chromosome.
6
Q
How can you show the possible gamete combinations?
A
By drawing a genetic diagram.
