Question

What is the purpose of recombination (crossing over)?

a. to ensure retention of genetic material from the parents
b. to bind homologous chromosomes tightly, so they do not accidentally separate at the wrong time
c. to eliminate unused genes by removing them
d. to complete DNA replication
e. to create chromosomes that are a new combination of paternal and maternal material

Answer 1

Recombination (crossing over) during meiosis creates genetically unique chromosomes by exchanging DNA between homologous non-sister chromatids, increasing genetic variation in offspring.

Step-by-step explanation:

The purpose of recombination (crossing over) is to create chromosomes that are a new combination of paternal and maternal material (e). During prophase I of meiosis, homologous chromosomes form a tetrad and exchange genetic material between non-sister chromatids. This exchange, also known as crossing-over, allows for genetic material to reattach at corresponding positions on homologous chromosomes, resulting in recombinant chromosomes that combine genes from both parents. This genetic variation is crucial for evolution and adaptation, as it produces unique gene combinations in offspring, thereby increasing the potential for natural selection to act on beneficial traits.