True or False?
· All new cells are produced by mitosis.
· Mitosis produces cells which are identical.
· Sperm cells contain 46 chromosomes.
· The cells of a mosquito contain 46
chromosomes.
· Meiosis produces cells with half the normal
chromosome number.
· In plants, pollen is produced by meiosis.…read more

Inheritance and Selection
Determining the Sex of Offspring…read more

Chromosomes found in the nucleus of a normal
human cell.…read more

Inheritance of Sex
· Human cells contain 23 pairs of chromosomes.
· Pair number 23 are the sex chromosomes.
· There are two types of sex chromosome, an X and
a Y.
· XX = female
· XY = male
· When the pairs separate in meiosis, all eggs
contain an X chromosome, sperm may contain an
X or a Y chromosome.…read more

Male body cell Female body
cell
Gametes Gametes
(Sperm) (Ova)
Fertilisation
Zygote…read more