Question

what is the difference between heterozygous and homozygous individuals?
the homozygote will express the dominant trait and the heterozygote will express the recessive trait.
all of the gametes from a homozygote carry the same version of the gene while those of a heterozygote will differ.
homozygotes have one chromosome while heterozygotes have two similar chromosomes.
heterozygotes carry two copies of a gene while homozygotes only carry one.

Explanation:

To solve this, we analyze each option:

• Option 1: Incorrect. Both homozygotes (e.g., \( AA \) or \( aa \)) and heterozygotes (e.g., \( Aa \)) can express dominant or recessive traits depending on the alleles. A homozygote \( aa \) expresses recessive, and heterozygote \( Aa \) expresses dominant (in complete dominance).
• Option 2: Correct. A homozygote (e.g., \( AA \) or \( aa \)) has two identical alleles, so all its gametes will carry the same version of the gene (either \( A \) or \( a \)). A heterozygote (e.g., \( Aa \)) has two different alleles, so its gametes will carry either \( A \) or \( a \), which are different versions.
• Option 3: Incorrect. Homozygotes have two identical chromosomes (homologous chromosomes with the same allele), and heterozygotes have two different alleles on homologous chromosomes, not "similar" in the allele sense.
• Option 4: Incorrect. Both homozygotes and heterozygotes carry two copies of a gene (one from each parent). Homozygotes have two identical copies, heterozygotes have two different copies.

Answer:

All of the gametes from a homozygote carry the same version of the gene while those of a heterozygote will differ.