Table of Contents
- 1 What process involves duplication of chromosomes?
- 2 Does meiosis involve duplication chromosomes?
- 3 What is synapsis of homologous chromosomes?
- 4 Does mitosis have Synapsis?
- 5 What involves homologous chromosomes?
- 6 Which chromosomes are involved in crossing over?
- 7 What are DNA or chromosomes duplicate?
- 8 When do chromosomes replicate?
What process involves duplication of chromosomes?
Bio Chap 08.2, 08.3, 10.2 Mitosis and Meiosis Comparison
| A | B |
|---|---|
| involves duplication of chromosomes | both mitosis and meiosis |
| chromosome number stays the same (starts with 2n ends with 2n) | mitosis |
| chromosome number is halved (starts with 2n ends with n) | meiosis |
| crossing over between homologous chromosomes may occur | meiosis |
Does meiosis involve duplication chromosomes?
Before germ cells enter meiosis, they are generally diploid, meaning that they have two homologous copies of each chromosome. Then, just before a germ cell enters meiosis, it duplicates its DNA so that the cell contains four DNA copies distributed between two pairs of homologous chromosomes.
Is mitosis involved in duplication of chromosomes?
Then, at a critical point during interphase (called the S phase), the cell duplicates its chromosomes and ensures its systems are ready for cell division. If all conditions are ideal, the cell is now ready to move into the first phase of mitosis.
What process involves crossing over?
Explanation: The crossing over of homologous chromosomes occurs in prophase I of meiosis. Prophase I of meiosis is characterized by the lining up of homologous chromosomes close together to form a structure known as a tetrad.
What is synapsis of homologous chromosomes?
Synapsis is the pairing of two chromosomes that occurs during meiosis. It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them. Synapsis takes place during prophase I of meiosis.
Does mitosis have Synapsis?
Synapsis takes place during prophase I of meiosis. When homologous chromosomes synapse, their ends are first attached to the nuclear envelope. Mitosis also has prophase, but does not ordinarily do pairing of two homologous chromosomes.
Where are chromosomes duplicated?
interphase
Explanation: DNA replication (and thus chromosome duplication) occurs during the interphase , the part of the cell cycle in which the cell is not dividing. It is important to know that the interphase is not part of mitosis.
Is the process of duplicating chromosomes prior to cell division?
In order for a cell to divide, all of its chromosomes must be duplicated in a process called DNA replication.
What involves homologous chromosomes?
Homologous chromosomes are made up of chromosome pairs of approximately the same length, centromere position, and staining pattern, for genes with the same corresponding loci. One homologous chromosome is inherited from the organism’s mother; the other is inherited from the organism’s father.
Which chromosomes are involved in crossing over?
Crossing over occurs between prophase I and metaphase I and is the process where two homologous non-sister chromatids pair up with each other and exchange different segments of genetic material to form two recombinant chromosome sister chromatids.
What is the product of chromosome duplication?
Chromatin is the substrate and also the product of chromosome duplication in eukaryotes. Very little is known about how the CMG helicase is able to traverse chromatin, or about how chromatin is regenerated subsequently.
Why is duplication of chromosomes necessary for mitosis?
DNA replication is an essential part of both mitosis and meiosis . It ensures that each daughter cell has the correct number of chromosomes. To replicate the DNA in mitosis, each chromosome replicates so that the new chromosome is attached to the original one at the centromere .
What are DNA or chromosomes duplicate?
Duplication is doubling of the amount of DNA as a result of DNA replication. During DNA replication, an exact replica of each chromosome is synthesized. This doubles the amount of DNA inside the cell. Thus, each chromatid gets doubled and is now called the sister chromatids.
When do chromosomes replicate?
During meiosis, chromosomes are replicated once in S phase (just like mitosis) into sister chromatids, but the cell divides twice. As with mitosis, the first step in this process is DNA replication, so that each of the 46 chromosomes exists as a duplicated sister chromatid.