The major role meiosis plays in chromosomal inheritance is to Multiple Choice split the chromosomes asymmetrically so daughter cells are in and 3n. halve the chromosome number from 2n to 1n. Prev 1 2 3 st of 14 — ?? ?
The Correct Answer and Explanation is:
The correct answer is: halve the chromosome number from 2n to 1n
Meiosis plays a crucial role in the process of sexual reproduction by reducing the chromosome number by half, from diploid (2n) to haploid (1n). This ensures that when gametes (sperm and egg) fuse during fertilization, the resulting zygote has the correct diploid number of chromosomes.
In humans, for example, somatic (body) cells have 46 chromosomes (2n = 46). These include two sets of chromosomes—one set from each parent. During meiosis, which occurs only in the reproductive organs (testes and ovaries), cells divide to produce gametes that each carry only 23 chromosomes (1n). If meiosis did not halve the chromosome number, fertilization would result in offspring with double the normal number of chromosomes (e.g., 2n + 2n = 4n), which is not compatible with life.
Meiosis consists of two successive cell divisions: meiosis I and meiosis II, but only one round of DNA replication. In meiosis I, homologous chromosomes (pairs of similar chromosomes, one from each parent) are separated, reducing the chromosome number from diploid to haploid. This is known as the reductional division. In meiosis II, the sister chromatids of each chromosome are separated, similar to mitosis, but the number of chromosomes remains haploid. This is the equational division.
An additional critical role of meiosis is to increase genetic diversity through processes such as crossing over (exchange of genetic material between homologous chromosomes during prophase I) and independent assortment (random distribution of maternal and paternal chromosomes to gametes). These mechanisms ensure that each gamete is genetically unique, contributing to variation within a species.
In summary, the major role of meiosis in chromosomal inheritance is to reduce the chromosome number from 2n to 1n, ensuring the stability of the species’ chromosome number across generations while also contributing to genetic diversity.
