Biology Inheritance / Variation & Genetics MDCAT 2019
PMDC Verified Question 72 of 94
Homozygous means:
A
Having two identical alleles of a gene
B
Alleles in an organism
C
Having two identical genes
D
Two different alleles of a gene
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Having two identical alleles of a gene
Concept:

Zygosity refers to the degree of similarity of the alleles for a trait in an organism.

Solution:

  • When both alleles of a gene pair in an organism are exactly the same (e.g., TT or tt), the organism is said to be homozygous for that specific trait.


Why other options are incorrect:

  • Having two different alleles: This defines a heterozygous condition (e.g., Tt).
  • Having two identical genes: The correct terminology is identical alleles of the same gene, not identical genes.

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