Consider the given two statements:
I: | Morphology of chromosomes is best studied at metaphase |
II: | At this stage, a chromosome is made up of two sister chromatids, held together at the centromere |
1. Both I and II are True and II explains I
2. Both I and II are True but II does not explain I
3. I is True but II is False
4. I is False but II is True
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
All the following key events take place during telophase of mitosis except:
1. Chromosomes cluster at the opposite spindle poles
2. Chromosomes become discrete
3. Nuclear envelope reforms
4. Nucleolus, ER and Golgi complex reform
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Liquid endosperm in coconut forms due to:
1. Failure of cytokinesis after karyokinesis
2. Failure of karyokinesis before cytokinesis
3. Disruption of spindle fibers at metaphase
4. Continued DNA replication during cytokinesis
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
During which stage of mitosis do the following events occur?
I. Centromeres split and chromatids separate
II. Chromatids move to opposite poles
1. | Prophase | 2. | Metaphase |
3. | Anaphase | 4. | Telophase |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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 |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
All the following are significances of mitosis except:
1. Restoration of nuclear/cytoplasmic ratio
2. Growth of living organisms
3. Replacement of lost cells
4. Generation of genetic variation
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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. |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
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 |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Males produce gametes by mitosis in:
1. | Honey bees | 2. | Grasshopper |
3. | Birds | 4. | Drosophila melanogaster |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.