Answer:
recombination and independent segregation of chromosomes during meiosis
Explanation:
Recombination and independent segregation of chromosomes represent the two most important meiotic mechanisms by which sisters from the same parents can inherit different gene variants and therefore look very different from each other:
1- Independent assortment (segregation) of chromosomes: during meiosis, homologous chromosomes are randomly distributed in daughter cells (which will give rise to the gametes), and therefore separate independently of each other. It is for that reason that gametes have unique combinations of chromosomes, which increases genetic variation.
2- Recombination, also known as crossing over, refers to the exchange of chromosome segments between non-sister chromatids during meiosis. This mechanism is well-known to produce new gene variants (alleles) in the daughter cells. In consequence, recombination also increases the genetic variation of the resulting gametes that will produce offspring (in this case, different sisters).
the 5-to-3 direction of one strand is counter to the 5-to-3 direction of the other strand.
Answer:
The correct answer is C. it joins Okazaki fragments together
Explanation:
During the DNA replication, the DNA is replicated by DNA polymerase and both the strand act as template strand. One strand is continuously synthesized by the DNA polymerase called the leading strand and the other strand is synthesized in a discontinuous manner called lagging strand.
In lagging strand due to discontinuous replication, many short nucleotide fragments are created which are called Okazaki fragments. These Okazaki fragments are joined by an enzyme DNA ligase. By making a bond between two Okazaki fragments it connects all fragments and makes a single daughter strand.
So the correct answer is C. it joins Okazaki fragments together.
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