l he term diploid means that a there are two homologous pair

l. he term diploid means that a. there are two homologous pairs in a given cell b. there are two nonhomologous chromosomes present. c. each chromosome is composed of two sister chromatids. d. there are two copies of every nonhomologous chromosome present. e. that the cell in question will produce two daughter cells. 2. Which of the following pairs of structures has the same amount of DNA? a. An unreplicated chromosome and a chromatid b. Two nonhomologous chromosomes c. A replicated chromosome and a sister chromatid d. A replicated chromosome and a bivalent e. All of the above are pairs that have equal amounts of DNA Questions 3 5 are based on the following information: A diploid zygote of a given species contains 40 chromosomes. 3. How many non-homologous chromosomes are associated with the genome of the organism? a. 120 b. 80 c. 40 d. 20 e. 10 4. How many DNA molecules are present in a somatic cell that is in metaphase of mitosis? a. 120 b. 80 c. 40 d. 20 e. 10 5. How many chromosomes are present in a secondary oocyte? a. 120 b. 80 c. 40 d. 20 e. 10

Solution

Ans: A) There are two homologous pairs in a given cell.

2. Which of the following pair of structure has the same amount of DNA?

Ans: A) An unreplicated chromosome and chromatid.

Explanation:

Question -3-5: A diploid zygote of given species contains 40 chromosomes.

3. How many non-homologous chromosomes are associated with the genome of the organism?

Ans: C) 40

4. How many DNA molecules are present in somatic cell that is in metaphase of mitosis?

Ans: C) 40

5. How many chromosomes are present in secondary oocytes?

Ans: D) 20

6. Based on chromosomes content and organization, this particular cell

Ans: A) is in mitosis

Explanation: i) Chromosomes are lined up at the metaphase plate.

ii) Each sister chromatid is attached to the spindle fiber.

7. Ans: D) Meiosis I

8. Ans: No. of genes that have different types of alleles: 5

No. of different gametes: 2

No. of combinations of genotypes= No. of different gametes to the power of no. of genes with different alleles.

No. of combinations of genotypes= (2)⁵=2 X 2 X 2 X 2 X 2=32.

E) 32