A person who is homozygous recessive at a locus has which of the following?
1. Two copies of the dominant allele
2. Two copies of the recessive allele
3. An autosomal trisomy
5. A recessive allele on the Y chromosome only
4. A recessive allele on the X chromosome only
Answer: 2 (Two copies of the recessive allele).
Explanation: Recessive homozygote is an individual, in which two copies of the same recessive allele (a) at a given locus are identical (aa). If two recessive alleles of the gene code the same type of protein, which shows the same type of character, then that is homozygous recessive (aa).
Read more about genotype: (Homozygous dominant (AA) or homozygous recessive (aa))
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