Module 2 - Cellular Basis of Inheritance

What is the main function of meiosis?

Meiosis is a cellular division process that reduces the diploid number (2n) of chromosomes to the haploid number (n).

How are chromosomes characterized?

Chromosomes are characterized based on length, position of the centromere, and arm length.

What is the chromosome number in human somatic cells?

The chromosome number in human somatic cells is 46, or 2n.

What are the two types of cell division processes discussed in the lecture?

The two types of cell division processes are mitosis and meiosis.

What occurs during the Prophase I of meiosis?

During Prophase I, homologous chromosomes undergo synapsis, and crossing over occurs, leading to genetic recombination.

What distinguishes between meiosis I and meiosis II?

Meiosis I is a reductional division that reduces chromosome number, while meiosis II is equational and resembles mitosis.

What are gametes?

Gametes are sex cells, namely sperm in males and eggs in females, that carry half the chromosome number of somatic cells.

What is a karyotype?

A karyotype is the number and appearance of chromosomes in the nucleus of a eukaryotic cell.

What is the significance of crossing over during meiosis?

Crossing over contributes to genetic diversity by recombining maternal and paternal genes.

What events occur in the cell during the S phase of interphase?

During the S phase, DNA replication occurs, and each chromosome is duplicated to form two sister chromatids.