Question

Which of these are genotypes and homozygous

aa
Aa
AA
Zz
ZZ
zz

Answer 1

A genotype refers to the genetic constitution of an individual, often represented by the letters denoting alleles. To determine if a genotype is homozygous, we look for instances where both alleles are identical.

Here’s the classification of the given genotypes:

1. **aa** - Homozygous (both alleles are "a")
2. **Aa** - Heterozygous (different alleles "A" and "a")
3. **AA** - Homozygous (both alleles are "A")
4. **Zz** - Heterozygous (different alleles "Z" and "z")
5. **ZZ** - Homozygous (both alleles are "Z")
6. **zz** - Homozygous (both alleles are "z")

In summary, the homozygous genotypes from your list are **aa**, **AA**, **ZZ**, and **zz**.