Question

question 2 2 pts in genetics, the phenomenon known as crossing over occurs when two chromosomes are passed on together. part of a chromosome breaks off and reattaches itself to a different chromosome. two genes near each other on the same chromosome have an effect on a trait. there is discontinuous variation.

Explanation:

To solve this, we analyze each option:

• Option 1: Passing two chromosomes together is not crossing over. Crossing over involves genetic material exchange, not just joint passage.
• Option 2: Crossing over in genetics is defined as a segment of a chromosome breaking off and reattaching to a non - homologous (different) chromosome. This matches the definition.
• Option 3: Genes near each other on the same chromosome affecting a trait is related to linkage, not crossing over.
• Option 4: Discontinuous variation is about the type of trait expression (like Mendelian traits) and has no relation to crossing over.

Answer:

B. part of a chromosome breaks off and reattaches itself to a different chromosome.