Is TT a homozygous recessive genotype?
When an organism has two of the same alleles for a specific gene, it is homozygous (homo means “same”) for that gene.
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Genotype and Phenotype.
| Genotype | Definition | Example |
|---|---|---|
| Heterozygous | One dominant allele and one recessive allele | Tt |
| Homozygous dominant | Two dominant alleles | TT |
| Homozygous recessive | Two recessive alleles | tt |
How do you write a homozygous recessive genotype?
When a particular gene has identical alleles (versions) of chromosomes inherited from both parents, the gene is homozygous. A homozygous trait is referred to by two capital letters (XX) for a dominant trait, and two lowercase letters (xx) for a recessive trait.
What genotype is recessive?
Recessive alleles are denoted by a lowercase letter (a versus A). Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait.
Is AA homozygous recessive?
Two dominant alleles (AA) or two recessive alleles (aa) are homozygous. One dominant allele and one recessive allele (Aa) is heterozygous.
Is TT heterozygous?
If an organism has two different alleles (Tt) for a certain gene, it is known as heterozygous (hetero means different).
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Genotype and Phenotype.
| Genotype | Definition | Example |
|---|---|---|
| Heterozygous | One dominant allele and one recessive allele | Tt |
| Homozygous dominant | Two dominant alleles | TT |
| Homozygous recessive | Two recessive alleles | tt |
What is the phenotype of genotype TT?
The phenotype of a plant with the genotype Tt would be tall. Here tallness (T) is a dominant trait over dwarfness (t), which is recessive.