Two different alleles define which zygosity?

Two different alleles define which zygosity?

• A. Heterozygous
• B. Homozygous
• C. Phenotype
• D. Genome

Answer: (A)

Zygosity describes whether the two copies of a gene are identical or different. When the two alleles are different, the organism is heterozygous (for example, Aa). If the alleles are the same, it is homozygous (AA or aa). Phenotype is the observable trait and can be influenced by dominance, environment, or interaction of alleles, but it isn’t the zygosity itself. The genome is the complete set of genetic material, not the zygosity status of a single gene. So, two different alleles define heterozygous.

Zygosity describes whether the two copies of a gene are identical or different. When the two alleles are different, the organism is heterozygous (for example, Aa). If the alleles are the same, it is homozygous (AA or aa). Phenotype is the observable trait and can be influenced by dominance, environment, or interaction of alleles, but it isn’t the zygosity itself. The genome is the complete set of genetic material, not the zygosity status of a single gene. So, two different alleles define heterozygous.