Meiosis results in the formation of:
1. Two genetically identical diploid cells
2. Two genetically non identical diploid cells
3. Four genetically identical haploid cells
4. Four genetically non identical haploid cells
The beginning of diplotene is recognized by:
I: | dissolution of the synaptonemal complex |
II: | the tendency of recombined homologues of bivalents to separate |
III: | tetrads becoming clearly visible |
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II, and III |
During anaphase I of meiosis
1. Homologous chromosomes separate
2. Non-homologous autosomes separate
3. Sister chromatids separate
4. Non-sister chromatids separate
Cells which are not dividing are likely to be at
1. | G1 | 2. | G2 |
3. | G0 | 4. | S phase |
In meiosis:
1. | A single round of DNA replication is followed by two sequential divisions with chromosome number and DNA content getting reduced twice |
2. | A single round of DNA replication is followed by two sequential divisions with chromosome number getting reduced twice and DNA content getting reduced once |
3. | A single round of DNA replication is followed by two sequential divisions with chromosome number getting reduced once and DNA content getting reduced twice |
4. | A single round of DNA replication is followed by two sequential divisions with chromosome number and DNA content getting reduced once |
The mechanisms that contribute to the genetic variation arising from sexual reproduction include:
I: | Independent assortment of chromosomes |
II: | Crossing over |
III: | Random fertilization |
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II and III |
A ribbon-like structure consisting of three protein components and extending across the region of synapsed chromosomes during the prophase of meiosis, is called:
1. | Phragmoplast | 2. | Phragmosome |
3. | Synaptonemal complex | 4. | Recombination nodule |
The point of contact between paired chromatids during meiosis, resulting in a cross-shaped configuration and representing the cytological manifestation of crossing over is called:
1. | Centromere | 2. | Centrosome |
3. | Chiasmata | 4. | Tetrad |
The most important significance of meiosis is that:
1. | It increases variations in the gene pool of the species that helps in evolution of that species. |
2. | It causes growth in the multicellular organisms. |
3. | It conserves specific number of chromosomes in each species across generations. |
4. | It is vital for repair and regeneration functions in the living organisms. |
Consider the following statements regarding meiosis:
I: | At metaphase I, the microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes. |
II: | At anaphase I, the homologous chromosomes separate, while sister chromatids remain associated with each other. |
Of the two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect