AP BIOLOGY

Detailed explanation-1: -So, the correct answer is D “Tt".

Detailed explanation-2: -If an organism has two different alleles ( Tt ) for a certain gene, it is known as heterozygous (hetero-means different). Genotype. Definition. Example.

Detailed explanation-3: -Heterozygous, as related to genetics, refers to having inherited different versions (alleles) of a genomic marker from each biological parent. Thus, an individual who is heterozygous for a genomic marker has two different versions of that marker.

Detailed explanation-4: -The notation tt means the homozygous condition, wherein the homologous pair contains same alleles of a gene. Alleles are different forms of one gene.

Detailed explanation-5: -An example of a heterozygous condition is inheriting different genes for eye colour from both biological parents. If there are two different versions, it is a heterozygous genotype for that particular gene.