Centromere is required for:
1. Movement of chromosomes toward poles
2. Cytoplasmic cleavage
3. Crossing over
4. Transcription
What occurs in crossing over:
1. Recombination
2. Mutation
3. Independent assortment
4. None
Crossing over that results in genetic recombination in higher organisms occurs between:
1. Non-sister chromatids of a bivalent
2. Two daughter nuclei
3. Two different bivalents
4. Sister chromatids of a bivalent
In the somatic cell cycle:
1. | DNA replication takes place in S-phase |
2. | A short interphase is followed by a long mitotic phase |
3. | \(G_2\) phase follows the mitotic phase |
4. | In the \(G_1\) phase, DNA content is double the amount of DNA present in the original cell |
Amount of cellular DNA increases during:
1. | Cytokinesis | 2. | Fertilisation |
3. | Mutation | 4. | Respiration |
If you are provided with the root tips of onion in your class and are asked to count the chromosomes, which of the following stages can you most conveniently look into?
1. Telophase
2. Anaphase
3. Prophase
4. Metaphase
Spindle fiber unites with which structure of chromosomes:
1. Chromocenter
2. Chromomere
3. Kinetochore
4. Centriole
The best material for the study of mitosis in the laboratory:
1. Anther
2. Root tip
3. Leaf tip
4. Ovary
At which stage of the cell cycle does DNA replication occur:
1. G1 - phase
2. S - phase
3. G2 - phase
4. M - phase
Which of the following stages of meiosis involves division of centromere?
1. Anaphase II
2. Telophase II
3. Metaphase I
4. Metaphase II