sex determination (B3.4) Flashcards
1
Q
how many pairs of sex chromosomes are found in human cells?
A
one pair of 23 pairs in human cells
2
Q
how is the sex of an individual determined?
A
by the combination of sex chromosomes
3
Q
which chromosome has less genes and why?
A
Y chromosome as it is smaller. It contains key genes needed to initiate male sexual development.
4
Q
what chromosomes do males and females have?
A
male- XY
female- XX
5
Q
Describe the sex chromosomes found in gametes?
A
sperm contains 23 chromosomes and one sex chromosome (X or Y). Ovum contains 23 chromosomes, one of which is always an X chromosome. Sperm cell determines sex.
