Question

2. A cell has a diploid number of chromosomes = 34 (2n = 34). (a) How many chromosomes will the daughter cells have after mitosis? (b) How many chromosomes will the daughter cells have after after Meiosis I? (c) How many chromosomes will the daughter cells have after after Meiosis II?

3. Describe each of these activities and identify in what stage of meiosis they occur: (a) crossing over (b) independent assortment of homologous chromosomes

Answer 1

2) a) diploid number of chromosomes=34

mitosis is the equational division that is both parent cells and daughter cells have the same number of chromosomes.

Before mitosis the DNA duplicate to form so when chromatin condenses to form chromosomes during mitosis, each chromosome has two sister chromatids attached to each other at the centromere, the chromatids are separated and moves to opposite poles, these chromatids become the chromosomes in the daughter cells.

number of chromosomes in the daughter cells after mitosis =34

b) a diploid cell has 2 sets of homologous chromosomes, that is for every chromosome there are two copies that is chromosomes in a diploid cell exists are homologous pair.

during meiosis I the homologous chromosomes are separated and moves to opposite poles and are separated so the daughter cells formed by meiosis I get only one set of homologous chromosomes and are haploid.

number of chromosomes in the cells after meiosis I=haploid number of chromosomes= 34/2=17

c) meiosis II is similar to mitosis, the sister chromatids are separated and moves to opposite poles and are separated into two daughter cells. Meiosis II occurs in haploid cells produced by meiosis I. The cells formed by meiosis II are also haploid, during meiosis sister chromatids are separated so gametes formed by meiosis I gets haploid set of unduplicated chromosomes.

number of chromosomes in the cells after meiosis II= 17