6. At which stage(s) of meiosis does the following occur? 1. Replication? ______________________________________ 2. Crossing over?...

6. At which stage(s) of meiosis does the following occur?

1. Replication? ______________________________________

2. Crossing over? ______________________________________

3. Random assortment? ______________________________________

4. Separation of bivalents? ______________________________________

5. Separation of sister chromatids? ______________________________________

6. Transition from diploid to haploid? ______________________________________

Solutions

Expert Solution

Answer :-

1. Replication occurs at the S phase or synthesis phase of the interphase. During S phase the amount of DNA gets doubled through replication.

2. Crossing over occurs in the pachytene stage of prophase 1. It is the phase of genetic recombination. Crossing over occurs by the process of synapsis.

3. The random assortment occur at prophase 1, where crossing over takes place and at metaphase 1, where homologous chromosomes are aligned at metaphase plate.

4. Separation of bivalents starts at pachytene (prophase 1) but gets completed at diplotene (prophase 1). Separation occurs by the terminalization of the chiasmata (point where chromosomes remain in contact).

5. Separation of sister chromatids occurs at anaphase 2 stage. The sister chromatids are pulled towards opposite pole from the metaphase plate.

6. Transition from diploid to haploid occurs at the meiosis 1. After the first cytokinesis daughter cells are considered haploid. Meiosis 1 is reductional division whereas meiosis 2 is equaltional division.

gladiator answered 1 year ago

Next > < Previous

Related Solutions

4. During what phase of meiosis does crossing-over occur? Give a reason why it cannot occur...

4. During what phase of meiosis does crossing-over occur? Give a reason why it cannot occur during the following phase (the phase immediately after the phase you chose for the first part of your answer).

1. Describe the processes of synapsis and crossing-over and explain when these processes occur within meiosis....

1. Describe the processes of synapsis and crossing-over and explain when these processes occur within meiosis. 2. Describe how chromosomal variation is an advantage to sexually reproducing organisms.

What is the significance of crossing over and when does it occur??

at what stage of meiosis does translocation occur in order to cause Down syndrome

What is crossing over? How is meiosis related to this phenomenon?

How does recombination impact genetic variation in future generations including crossing over and meiosis?

which of the following are differences between mitosis and meiosis 1? Choose all that apply A)Crossing...

which of the following are differences between mitosis and meiosis 1? Choose all that apply A)Crossing over occurs during meiosis 1 but not mitosis B)DNA replication takes place prior to mitosis but not before meiosis C)Sister chromatids separate in mitosis and homologs (homologous chromosomes) separate in meiosis 1 D)Only meiosis 1 results in daughter cells that contain identical genetic information E)Miosis 1 results in two daughter cells, while mitosis results in four daughter cells

6. During which stage(s) of meiosis do you expect to find tetrads? A. Prophase I only...

6. During which stage(s) of meiosis do you expect to find tetrads? A. Prophase I only B. Prophase I and metaphase I C. Prophase I, metaphase I, and anaphase I D. Prophase I and prophase II 7. The stages of meiosis where independent assortment occurs and crossing over begins, respectively, are A. Metaphase I and II and prophase I and II B. Metaphase I and prophase II C. Metaphase I and prophase I D. Metaphase II and prophase I 10....

1. Name five differences between mitosis and meiosis. 2. During meiosis, which two processes occur that...

1. Name five differences between mitosis and meiosis. 2. During meiosis, which two processes occur that can increase genetic variation in the gametes? A. independent assortment and crossing over B. crossing over and cytokinesis C. separation of the sister chromatids in Anaphase I and cytokinesis D. independent assortment and cytokinesis E. cytokinesis and sexual reproduction

Comparing nuclear and chromosomal activities in mitosis and meiosis Mitosis Meiosis Synapsis Crossing over When centromeres...

Comparing nuclear and chromosomal activities in mitosis and meiosis Mitosis Meiosis Synapsis Crossing over When centromeres separate Chromosome structure and movement during anaphase Number of divisions Number of chromosomes in daughter cells Genetic similarity of daughter cells to parent cells

Subjects