For a species of 2n-40, indicate the number of chromosomes, c-value, and ploidy

ID: 191304 • Letter: F

Question

For a species of 2n-40, indicate the number of chromosomes, c-value, and ploidy you would expect in a cell at each of the following phases. (3) 4. # of Chromosomes ploidy Metaphase of mitosis Metaphase l of meiosis Metaphase II of meiosis a. CDC b. 40 c. Suppose that an organism is 2n-6. Draw a cell from this organism at Metaphase of mitosis and a cell at metaphase I of meiosis. The genotype of this organism is A/a; B/b; EG/eg where the "E/e and G/g" genes are on the same chromosome but the other genes are on different chromosomes. Using these gene symbols, be sure to label all chromatids. The diagram below shows a cell prior to DNA replication: (4) 5. E G

Explanation / Answer

4. The answer is

The diploid chromsomes number i.e. 2n =40

Stage of the Division

# of chromosomes

C value

Ploidy

Metaphase of mitosis

Explanation: As the metaphase occurs after the S phase of interphase (where the DNA duplication occurs), the c value duplicated, but as the chromosome number constant the ploidy is constant

Metaphase I of meiosis

Explanation: As the metaphase of meiosis I occurs after the S phase of interphase (where the DNA duplication occurs), the c value duplicated, but as the chromosome number constant the ploidy is constant

Metaphase II of meiosis.

Explanation: As the metaphase of meiosis II occurs after anaphase I of meiosis (where the chromosome segregation occurs), the c value reduced to half, so the chromosome number reduces to half, the ploidy reduces to half.

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