Question

which three of the following sentences describe the process or results of meiosis?
a. meiosis produces cells that are genetically identical to the parent cell.
b. gametes are produced through meiosis. when fertilization occurs, it results in a diploid organism.
c. meiosis results in four daughter cells, each containing the haploid chromosome number of an organism.
d. meiosis results in four daughter cells, each containing the diploid chromosome number of an organism.
e. crossing over during prophase i allows cells to exchange genetic information and creates cells with unique combinations of dna.

Explanation:

• Option A: Mitosis (not meiosis) produces genetically identical cells to the parent cell. So, A is incorrect.
• Option B: Gametes (sperm and egg cells) are haploid and produced via meiosis. When fertilization (sperm + egg) occurs, a diploid zygote (and then a diploid organism) is formed. So, B is correct.
• Option C: Meiosis has two rounds of division (Meiosis I and Meiosis II). Starting with a diploid cell, it results in four haploid daughter cells. So, C is correct.
• Option D: As explained for C, meiosis results in haploid (not diploid) cells. So, D is incorrect.
• Option E: During Prophase I of meiosis, homologous chromosomes pair up and crossing - over (exchange of genetic material) occurs. This leads to genetic variation (unique DNA combinations). So, E is correct.

Answer:

B. Gametes are produced through meiosis. When fertilization occurs, it results in a diploid organism.
C. Meiosis results in four daughter cells, each containing the haploid chromosome number of an organism.
E. Crossing over during Prophase I allows cells to exchange genetic information and creates cells with unique combinations of DNA.