Homozygous and Heterozygous Flashcards

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What does homozygous mean?

Homozygous means having two copies of the same allele for a gene.

What does heterozygous mean?

Heterozygous means having two different alleles for a gene.

Give one example of a homozygous genotype using the letter T.

TT or tt are both homozygous genotypes.

Give one example of a heterozygous genotype using the letter T.

Tt is a heterozygous genotype.

What is the difference between homozygous dominant and homozygous recessive?

Homozygous dominant has two dominant alleles (TT). Homozygous recessive has two recessive alleles (tt).

If a person is heterozygous Tt, which allele will affect their trait: T or t?

The dominant allele T will affect their trait.

Why can a heterozygous person be a carrier of a recessive disorder?

They have one normal dominant allele and one recessive disease allele, so they do not show the disorder but can pass it on.

For one gene, how many types of gametes can a homozygous person make?

One type, because both alleles for that gene are the same.

For one gene, how many types of gametes can a heterozygous person make?

Two types, because they can pass on either of their two different alleles.

How can you tell from genetic letters if someone is homozygous or heterozygous?

If the two letters are the same (TT or tt) they are homozygous. If the letters are different (Tt) they are heterozygous.

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