A cell with 2n = 6 proceeds though M phase. The resulting number of cells is_ an

Question

A cell with 2n = 6 proceeds though M phase. The resulting number of cells is_ and the chromosome count per cell is a) 4, 6 b) 1, 3 c) 2, 6 d) 2, 3 e) 4, 3 A starting cell culture contains 5 cells. Each cell in the culture undergoes M phase twice. How many cells does the culture contain after completion of M phase? a) 2 b) 5 c) 10 d) 20 e) 40 A cell in interphase contains 2n - 10 chromosomes. How many DNA strands will be present in such cell at G_2 phase and at metaphase, respectively? a) 1, 20 b) 40, 40 c) 20, 40 d) 40, 80 c) 20, 20 Which of the following occurs during prophase? a) chromosomes line up in the middle of the cell b) the nuclear envelope breaks down c) cytokinetsis d) sister chromatids are synthesized e) centrosomes divide Cytokinesis is a part of mitosis. a) true b) false The photograph shows two cells in different stages of cell cycle: a) 1 - prophase, 2 - interphase b) 1- metaphase, 2- telophase c) 1 - interphase, 2- metaphase d) 1- anaphase, 2 - telophase4 What is the outcome of synapsis, a significant event in meiosis? A) side - by - side alignment of nonhomologous chromosomes B) dyad formation c) monad movement to opposite poles D) side-by-side alignment of homologous chromosomes E) chiasma segregation A hypothetical cell has a 2n = 16 chromosomes. What is the number of chromosomes per daughter cell meiosis? a) 1 b) 2 c) 4 d) 8 e) 16 How many 2^nd polar bodies are formed during human oogenesis from one oogonium? a) 1 b) 2 c) 3 d) 4 e) 0 During animal gametogenesis, 20 spermatogonia enter meiosis. How many sperm cells will be for a) 5 b) 10 c) 20 d) 40 e) 80 Which of the following is a characteristic seen in prophase 1 that does not occur in prophase II? a) chromosomes move to the middle of the cell b) cytokinesis occurs

Explanation / Answer

Answer:

1. (c) 2, 6

Mitosis is equational division. The cell (2n = 6) undergoes DNA duplication during S phase, and divides during M phase to produce 2 identical daughter cells with 6 chromosomes.

2. (d) 20

5 cells gives rise to 10 cells after first mitosis and 20 cells after second mitosis. (It has been taken into account that everything is normal, that is cytokinesis takes place after the first M phase)

3. (b) 40, 40

Chromosomes are the thread-like form in DNA molecules in the nucleus of every cell in our body. In a human cell, there are 46 individual chromosomes and/or 23 chromosomes if in pairs. (1 chromosome consists of 2 DNA strands)

Here, 2n=10. At S phase, the DNA duplicates. So, at G2 phase, the number of chromosomes will be 20 and number of strands = 40. At metaphase also, the number of chromosomes will be 20 (strands = 40) since the chromosomes have not yet separated.

4. (b) the nuclear envelope breaks down.

During prophase, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down.

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