Identify the correct statement amongst the following:
1. | Crossing over occurs in prophase I of meiosis and metaphase of mitosis. |
2. | DNA replication occurs once prior to mitosis and twice prior to meiosis. |
3. | Both mitosis and meiosis result in daughter cells identical to the parent cells. |
4. | Karyokinesis occurs once in mitosis and twice in meiosis. |
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 |
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
Synapsis occurs between
1. mRNA and ribosomes
2. Spindle fibers and centromere
3. Two homologous chromosomes
4. A male and a female gamete
The enzyme recombinase is required at which stage of meiosis ?
1. | Pachytene | 2. | Zygotene |
3. | Diplotene | 4. | Diakinesis |
Match each item in Column I with one in Column II and select the correct answer from the codes given below:
Column I |
|
Column II |
|
A |
Zygotene |
a |
Pairing of homologous chromosomes |
B |
Pachytene |
b |
Appearance of chiasma |
C |
Diplotene |
c |
Terminalization of chiasma |
D |
Diakinesis |
d |
Crossing over |
Codes
A | B | C | D | |
1. | a | c | b | d |
2. | a | d | b | c |
3. | a | b | c | d |
4. | b | c | d | a |
The correct chronology of stages of Prophase I is:
1. Leptotene – Zygotene – Pachytene – Diplotene – Diakinesis
2. Leptotene – Pachytene – Zygotene – Diplotene – Diakinesis
3. Leptotene – Zygotene – Pachytene – Diakinesis – Diplotene
4. Zygotene – Leptotene – Pachytene – Diakinesis – Diplotene
Which of the following stages of Prophase I of meiosis I can last for many months or years in certain vertebrate oocytes?
1. | Zygotene | 2. | Pachytene |
3. | Diplotene | 4. | Diakinesis |
The paired homologues seen during zygotene of meiosis I are known as:
1. | Bivalent | 2. | Tetrad |
3. | Mitotic apparatus | 4. | Sister chromosomes |
Which of the following is not a feature of diakinesis stage of prophase I of meiosis I?
1. Terminalization of chiasmata
2. Meiotic spindle assembling to prepare separation of homologues
3. Decondensation of the chromatin
4. NEBD and disappearance of nucleolus