Question

a genotype of tt is ____________. a homozygous recessive b homozygous dominant c heterozygous d sex - linked

Explanation:

• Homozygous: Refers to having two identical alleles for a particular gene.
• Recessive: An allele that is only expressed when two copies are present (in a homozygous state). Since the genotype is "tt" (two identical alleles, and using a lowercase letter which typically represents a recessive allele), it fits the homozygous recessive definition.
• Homozygous dominant (e.g., "TT") would have two dominant (uppercase) alleles.
• Heterozygous (e.g., "Tt") has two different alleles (one dominant and one recessive).
• Sex - linked refers to genes located on sex chromosomes, which is not indicated by the "tt" notation.

Answer:

A. homozygous recessive