Leaving Certificate Biology Practice Test

Having two different alleles for a gene is described as

Heterozygous Homozygous Monohybrid Polygenic

Correct Answer:

Heterozygous

Explanation:

Having two different alleles for a gene means the genotype is heterozygous. In diploid organisms, you inherit one allele from each parent at the same gene locus, and if those alleles are different forms of the gene, that combination is heterozygous. If the two alleles were identical, that would be homozygous. Monohybrid refers to studying inheritance for a single gene, and polygenic describes traits influenced by many genes, so they’re about patterns of inheritance or the number of genes involved, not the identity of the two alleles at one locus.

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