B In pachytene recombination nodule is formed after which crossing over. Pachytene stage is characterized by formation of synaptonemal complex which allows the exchange of genetic material between the homologous chromosomes by a process known as crossing over. This also helps in generation of recombinants. - Diplotene - This stage characterized by chiasmata formation. - Lepotene - In this stage chromosomes begin to condense. - Zygotene- In this stage synapsis taken place.
[NEET-2016 Phase-I]
Cell cycle and Cell Division
230965
Independent assortment of gene occurs due to the orientation of chromosomes at
1 metaphase-I of mitosis
2 metaphase-I of meiosis
3 metaphase-II of meiosis
4 any phase of the cell division
Explanation:
B Independent assortment is defined as the inheritance of the character within the same individual. This is due to the orientation of the chromosome at the equatorial plane in the metaphase-I of meiosis. It is random orientation homologous chromosome pairs during metaphase-I allow for the production of gametes with many different assortments of homologous chromosomes.
[JIPMER-2015]
Cell cycle and Cell Division
230971
At which stage of the meiosis, the bivalents are formed?
1 Leptotene
2 Pachytene
3 Zygotene
4 Diplotene
Explanation:
C Zygotene - At zygotene stage of meiosis, the bivalent or a tetrad are formed. The pairing of homologus chromosomes take place at this stage. This phenomenon known as synapsis. Each pair of homologus chromosomes forms as a result of synapsis is called a bivalent or a tetrad. Leptotene - Beaded long chromosomes. Diplotene - Bivalent repel each other except at site of crossovers.
[J and K CET-2002]
Cell cycle and Cell Division
230981
During the meiotic division, the
1 homologous chromosomes are separated
2 linkage in disturbed
3 homologous chromosomes do not segregate
4 All of the above
Explanation:
A In the meiosis mother cell divides two times after one round of DNA replication. Meiosis I- Reductional division - The separation of homologous chromosome occur. Meiosis II- Equational division - Daughter cell have same number of chromosome as the parents cell enter in meiosis-II know as homotypic division.
B In pachytene recombination nodule is formed after which crossing over. Pachytene stage is characterized by formation of synaptonemal complex which allows the exchange of genetic material between the homologous chromosomes by a process known as crossing over. This also helps in generation of recombinants. - Diplotene - This stage characterized by chiasmata formation. - Lepotene - In this stage chromosomes begin to condense. - Zygotene- In this stage synapsis taken place.
[NEET-2016 Phase-I]
Cell cycle and Cell Division
230965
Independent assortment of gene occurs due to the orientation of chromosomes at
1 metaphase-I of mitosis
2 metaphase-I of meiosis
3 metaphase-II of meiosis
4 any phase of the cell division
Explanation:
B Independent assortment is defined as the inheritance of the character within the same individual. This is due to the orientation of the chromosome at the equatorial plane in the metaphase-I of meiosis. It is random orientation homologous chromosome pairs during metaphase-I allow for the production of gametes with many different assortments of homologous chromosomes.
[JIPMER-2015]
Cell cycle and Cell Division
230971
At which stage of the meiosis, the bivalents are formed?
1 Leptotene
2 Pachytene
3 Zygotene
4 Diplotene
Explanation:
C Zygotene - At zygotene stage of meiosis, the bivalent or a tetrad are formed. The pairing of homologus chromosomes take place at this stage. This phenomenon known as synapsis. Each pair of homologus chromosomes forms as a result of synapsis is called a bivalent or a tetrad. Leptotene - Beaded long chromosomes. Diplotene - Bivalent repel each other except at site of crossovers.
[J and K CET-2002]
Cell cycle and Cell Division
230981
During the meiotic division, the
1 homologous chromosomes are separated
2 linkage in disturbed
3 homologous chromosomes do not segregate
4 All of the above
Explanation:
A In the meiosis mother cell divides two times after one round of DNA replication. Meiosis I- Reductional division - The separation of homologous chromosome occur. Meiosis II- Equational division - Daughter cell have same number of chromosome as the parents cell enter in meiosis-II know as homotypic division.
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Cell cycle and Cell Division
230962
In meiosis crossing over is initiated at
1 Diplotene
2 Pachytene
3 Leptotene
4 Zygotene
Explanation:
B In pachytene recombination nodule is formed after which crossing over. Pachytene stage is characterized by formation of synaptonemal complex which allows the exchange of genetic material between the homologous chromosomes by a process known as crossing over. This also helps in generation of recombinants. - Diplotene - This stage characterized by chiasmata formation. - Lepotene - In this stage chromosomes begin to condense. - Zygotene- In this stage synapsis taken place.
[NEET-2016 Phase-I]
Cell cycle and Cell Division
230965
Independent assortment of gene occurs due to the orientation of chromosomes at
1 metaphase-I of mitosis
2 metaphase-I of meiosis
3 metaphase-II of meiosis
4 any phase of the cell division
Explanation:
B Independent assortment is defined as the inheritance of the character within the same individual. This is due to the orientation of the chromosome at the equatorial plane in the metaphase-I of meiosis. It is random orientation homologous chromosome pairs during metaphase-I allow for the production of gametes with many different assortments of homologous chromosomes.
[JIPMER-2015]
Cell cycle and Cell Division
230971
At which stage of the meiosis, the bivalents are formed?
1 Leptotene
2 Pachytene
3 Zygotene
4 Diplotene
Explanation:
C Zygotene - At zygotene stage of meiosis, the bivalent or a tetrad are formed. The pairing of homologus chromosomes take place at this stage. This phenomenon known as synapsis. Each pair of homologus chromosomes forms as a result of synapsis is called a bivalent or a tetrad. Leptotene - Beaded long chromosomes. Diplotene - Bivalent repel each other except at site of crossovers.
[J and K CET-2002]
Cell cycle and Cell Division
230981
During the meiotic division, the
1 homologous chromosomes are separated
2 linkage in disturbed
3 homologous chromosomes do not segregate
4 All of the above
Explanation:
A In the meiosis mother cell divides two times after one round of DNA replication. Meiosis I- Reductional division - The separation of homologous chromosome occur. Meiosis II- Equational division - Daughter cell have same number of chromosome as the parents cell enter in meiosis-II know as homotypic division.
B In pachytene recombination nodule is formed after which crossing over. Pachytene stage is characterized by formation of synaptonemal complex which allows the exchange of genetic material between the homologous chromosomes by a process known as crossing over. This also helps in generation of recombinants. - Diplotene - This stage characterized by chiasmata formation. - Lepotene - In this stage chromosomes begin to condense. - Zygotene- In this stage synapsis taken place.
[NEET-2016 Phase-I]
Cell cycle and Cell Division
230965
Independent assortment of gene occurs due to the orientation of chromosomes at
1 metaphase-I of mitosis
2 metaphase-I of meiosis
3 metaphase-II of meiosis
4 any phase of the cell division
Explanation:
B Independent assortment is defined as the inheritance of the character within the same individual. This is due to the orientation of the chromosome at the equatorial plane in the metaphase-I of meiosis. It is random orientation homologous chromosome pairs during metaphase-I allow for the production of gametes with many different assortments of homologous chromosomes.
[JIPMER-2015]
Cell cycle and Cell Division
230971
At which stage of the meiosis, the bivalents are formed?
1 Leptotene
2 Pachytene
3 Zygotene
4 Diplotene
Explanation:
C Zygotene - At zygotene stage of meiosis, the bivalent or a tetrad are formed. The pairing of homologus chromosomes take place at this stage. This phenomenon known as synapsis. Each pair of homologus chromosomes forms as a result of synapsis is called a bivalent or a tetrad. Leptotene - Beaded long chromosomes. Diplotene - Bivalent repel each other except at site of crossovers.
[J and K CET-2002]
Cell cycle and Cell Division
230981
During the meiotic division, the
1 homologous chromosomes are separated
2 linkage in disturbed
3 homologous chromosomes do not segregate
4 All of the above
Explanation:
A In the meiosis mother cell divides two times after one round of DNA replication. Meiosis I- Reductional division - The separation of homologous chromosome occur. Meiosis II- Equational division - Daughter cell have same number of chromosome as the parents cell enter in meiosis-II know as homotypic division.