CELL DIVISION
MEIOSIS AND GENETIC VARIATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Interphase-this is where the cell performs cellular processes essential for life.
|
|
|
Prophase I-Crossing-over occurs, within which the chromosomes are sharing their DNA with identical genes.
|
|
|
Metaphase I-This is where the chromosomes line up in the middle of the cell.
|
|
|
there is no alikeness between meiosis and mitosis.
|
Detailed explanation-1: -Prophase I: The homologous chromosomes line up together. During this time, a process that only happens in meiosis can occur. This process is called crossing over (Figure here), which is the exchange of DNA between homologous chromosomes. Crossing over forms new combinations of alleles on the resulting chromosome.
Detailed explanation-2: -Synapsis occurs only during meiosis.
Detailed explanation-3: -Which of the following occurs during meiosis but not during mitosis? Synapsis occurs. The pairing of homologous chromosomes that only occurs during prophase I of meiosis is called synapsis.
Detailed explanation-4: -Crossing Over is the phenomenon of genetic exchange between homologous pair of chromosomes and is a characteristic feature of meiotic cell division. It does not occur in mitosis.
Detailed explanation-5: -Meiosis also differs from mitosis in that it involves a process known as recombination, during which chromosomes exchange segments with one another. As a result, the gametes produced during meiosis are genetically unique.