homozygous 

asexual

homologous

genes

tetrad

triad

diploid

gamete

male genotype

genetic variation

DNA replication

mitosis

20

40

80

160

So the offspring has genes from both parents

So the offspring has genes from one parent

So the offspring has genes from neither parents

So the offspring makes its own genes

To double the number of chromosomes going into sex cells

To halve the number of chromosomes going into sex cells

To triple the number of chromosomes going into sex cells

To not change the number of chromosomes going into sex cells

crossing over

replication

synthesis

translation

sex cells

somatic cells

body cells

skin cells

mitosis

meiosis

6

22

4

46