What are the differences between homozygous and heterozygous?

Answer 1

Remeber that when creating a zygote (baby) each parent contributes one copy of each chromosome so the resulting individual has two sets of chromosomes (two copies of 23 chromosomes for a resulting 46 chromosomes in humans)

Homozygous means that both of the parents have given the same allele (for example both parents have blue eyes) they can give two dominant or two recessive alleles.

Heterozygous means each parent gave the baby a different allele (option) such as if one parent had blue eyes and one parent had brown eyes. The dominant allele (in this case the brown eye color) would be expressed (used)

Answer 2

(Almost) all your genes are paired - that is, you carry two copies of each one.

If the 2 copies are identical - you're homozygous.

If they're different - you're heterozygous.

With thousands of genes, you're a mix of both.