The first 22 pairs of chromosomes contain hundreds of genes in the same positions and sequence. If the code of the gene from one parent is exactly like the code of the same gene from the other parent, the gene pair is heterozygous.

Question

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If the code of the gene from one parent is exactly like the code of the same gene from the other parent, the gene pair is homozygous, not heterozygous. Heterozygous means the gene codes from each parent are different.

The First 22 Pairs of Chromosomes Contain Hundreds of Genes