X and Y Chromosomes Flashcards
1
Q
How many matched pairs of chromosomes are there In the human body?
A
22 matched pairs
The 23rd pair are labelled XX or XY
2
Q
What chromosomes does a male have?
A
XY
The Y causes the male characteristics
3
Q
What chromosomes do females have?
A
XX
allowing the female characteristics to develop
4
Q
What happens when making sperm?
A
The X and Y chromosome are drawn apart in the first division of meiosis
There’s a 50% chance each stern gets an X chromosomes and 50% chance it gets a Y chromosome
5
Q
What happens when making eggs?
A
Similar thing happens but the original cell has two X chromosomes so all the eggs have one X chromosome
6
Q
What do genetic diagrams show?
A
The probability of getting a boy or a girl or a child with certain characteristics
