X and Y chromosomes Flashcards
1
Q
How many pairs of chromosomes in every human body cell? of these which one are matched pairs and what is the last?
A
23
22 are matched pair and the 23rd is labelled XY or XX = the chromosomes which decide your sex
2
Q
Males and female chromosomes and combinations
A
Males = XY , y causes male characteristics
Female = XX , x allow female characteristics to develop
3
Q
When making sperm, what occurs?
A
1) X and Y chromosomes are drawn apart in the first cell division in meiosis
2) 50% chance each sperm cell can get x chromosomes and y chromosomes
similar thing when making eggs
