How many pairs of homologous chromosomes are there after meiosis 1?

23 pairs
At the conclusion of anaphase, each end of the cell has an identical and complete set of 46 chromosomes or 23 pairs of homologous chromosomes; they are still diploid.

How many chromosomes are at the end of meiosis 1?

23
In humans (2n = 46), who have 23 pairs of chromosomes, the number of chromosomes is reduced by half at the end of meiosis I (n = 23).

What happens if homologous chromosomes fail to separate in meiosis?

If homologous chromosomes fail to separate during meiosis I, the result is two gametes that lack that particular chromosome and two gametes with two copies of the chromosome.

What happens to homologous chromosomes during meiosis 1 and 2?

In anaphase I, the homologous chromosomes are separated. In prometaphase II, microtubules attach to the kinetochores of sister chromatids, and the sister chromatids are arranged at the midpoint of the cells in metaphase II. In anaphase II, the sister chromatids are separated.

During which phase of meiosis do homologous chromosomes form pairs?

prophase I
During prophase I, homologous chromosomes pair up and exchange sections of DNA. This is called recombination or crossing over. This is followed by metaphase I where the connected pairs of chromosomes align at the middle of the cell. After the pairs of chromosomes are aligned, anaphase I begins.

What happens at the end of meiosis 1?

Meiosis I ends when the chromosomes of each homologous pair arrive at opposing poles of the cell. The microtubules disintegrate, and a new nuclear membrane forms around each haploid set of chromosomes. The chromosomes uncoil, forming chromatin again, and cytokinesis occurs, forming two non-identical daughter cells.

What is the term for an error in which homologous chromosomes fail to separate during meiosis or mitosis?

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division.

Do homologous chromosomes separate in meiosis 1?

Homologous chromosomes are separated during anaphase of meiosis I. Chromatids are separated during anaphase of meiosis II.

Which event occurs during meiosis 2 but not during meiosis 1?

crossing over
In meiosis II, these chromosomes are further separated into sister chromatids. Meiosis I includes crossing over or recombination of genetic material between chromosome pairs, while meiosis II does not.