If an individual has two identical alleles for a gene, this genotype is called:

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Study for the Leaving Certificate Biology Test. Enhance your understanding with detailed questions and comprehensive explanations. Prepare effectively and boost your confidence for the exam!

Multiple Choice

If an individual has two identical alleles for a gene, this genotype is called:

Explanation:
When both copies of a gene are the same allele, the organism is homozygous for that gene. This means you have either two dominant alleles (BB) or two recessive alleles (bb). If the two alleles are different (one dominant, one recessive), the genotype is heterozygous. Hemizygous refers to having only one allele for a gene (as in males for many X-linked genes), while monogenic refers to a trait controlled by a single gene, not the state of the alleles themselves. So, two identical alleles define homozygous.

When both copies of a gene are the same allele, the organism is homozygous for that gene. This means you have either two dominant alleles (BB) or two recessive alleles (bb). If the two alleles are different (one dominant, one recessive), the genotype is heterozygous. Hemizygous refers to having only one allele for a gene (as in males for many X-linked genes), while monogenic refers to a trait controlled by a single gene, not the state of the alleles themselves. So, two identical alleles define homozygous.

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