Question

what is the significance of genetic variation produced by meiosis? (1 point) it prevents genetic disorders it reduces the number of chromosomes it allows for adaptation and evolution it ensures identical offspring which structure is responsible for moving chromosomes during meiosis? (1 point) nucleolus ribosomes spindle fibers

Explanation:

First Question (Genetic Variation from Meiosis)

• Option 1: Meiosis doesn't prevent genetic disorders (e.g., chromosomal abnormalities can still occur), so incorrect.
• Option 2: Meiosis reduces chromosome number by half for gametes, but this isn't the main significance of genetic variation from meiosis. Incorrect.
• Option 3: Genetic variation from meiosis (like crossing over, independent assortment) creates diverse genotypes, enabling adaptation and evolution as populations can respond to environmental changes. Correct.
• Option 4: Meiosis increases genetic diversity, while identical offspring come from asexual reproduction (mitosis - related cloning). Incorrect.

• Nucleolus: Involved in ribosome production, not chromosome movement. Incorrect.
• Ribosomes: Synthesize proteins, not involved in chromosome movement. Incorrect.
• Spindle fibers: Form during cell division (meiosis/mitosis) and attach to chromosomes, pulling them during anaphase for segregation. Correct.

Answer:

C. It allows for adaptation and evolution

Second Question (Structure for Moving Chromosomes in Meiosis)