An organism with two identical alleles is:

Explanation

The correct option is d) Homozygous. Now, let's explain each option individually: a) Dominant: The term "dominant" refers to an allele that is expressed or observed in the phenotype of an organism. In genetics, dominant alleles are represented by uppercase letters, while recessive alleles are represented by lowercase letters. Dominant alleles can mask the effects of recessive alleles. However, having two identical alleles does not necessarily imply dominance. Both dominant and recessive alleles can exist in a homozygous state. b) Hybrid: The term "hybrid" is used to describe the offspring of two different species or varieties of organisms. It is not applicable in the context of a single organism having two identical alleles. Hybridization involves the combination of genetic material from different sources, resulting in offspring with a mixture of traits from each parent. c) Heterozygous: The term "heterozygous" refers to a condition where an organism has two different alleles for a particular gene. In this case, the alleles can be either dominant or recessive. Heterozygotes typically display the phenotype associated with the dominant allele. However, if an organism has two identical alleles, it is not heterozygous because it lacks the presence of different alleles. d) Homozygous: The term "homozygous" describes a condition where an organism has two identical alleles for a specific gene. Homozygotes can have either two dominant alleles (referred to as homozygous dominant) or two recessive alleles (referred to as homozygous recessive). In this case, since the question states that the organism has two identical alleles, it is homozygous. Therefore, the correct answer is d) Homozygous, as it accurately describes an organism with two identical alleles.