Which term describes a form of reproductive isolation caused by geographic barriers?

Which term describes a form of reproductive isolation caused by geographic barriers?

• A. Homozygous
• B. Ge geographical Isolation
• C. Artificial Selection
• D. Karyotype

Answer: (B)

Geographical isolation is when physical barriers like mountains, rivers, or bodies of water split a population into separate groups. Because the groups can’t meet to breed, gene flow between them is reduced or stopped. Over many generations, the separated populations accumulate genetic differences through mutation, natural selection in different environments, and genetic drift. If the barrier stays or is later removed, these differences can prevent interbreeding, causing reproductive isolation and potentially leading to speciation. The other terms aren’t about separating populations by geography: homozygous refers to having identical alleles, artificial selection is human-directed breeding, and karyotype describes chromosome makeup.

Geographical isolation is when physical barriers like mountains, rivers, or bodies of water split a population into separate groups. Because the groups can’t meet to breed, gene flow between them is reduced or stopped. Over many generations, the separated populations accumulate genetic differences through mutation, natural selection in different environments, and genetic drift. If the barrier stays or is later removed, these differences can prevent interbreeding, causing reproductive isolation and potentially leading to speciation. The other terms aren’t about separating populations by geography: homozygous refers to having identical alleles, artificial selection is human-directed breeding, and karyotype describes chromosome makeup.