All categories

3 years ago

During which phase of meiosis does each of the following events occur?

Biology

1 answer:

lubasha [3.4K]3 years ago

6 0

Answer:

(a) crossing over: Meiosis I, Recombination

(b) chromatids separate at their centromeres and migrate to opposite poles: Meiosis II, Anaphase II

Explanation:

Homologous recombination is a type of genetic recombination that occurs during meiosis (formation of ovum and sperm cells). The paired chromosomes of the male and female parents are aligned so that similar DNA sequences intersect. This crossing over produces an exchange of genetic material, which is an important cause of the genetic variability observed in the offspring.

Meiosis II: Anaphase II. The centromeres separate and the daughter chromatids - now individual chromosomes - move to the opposite poles of the cell. The centromeres separate, and the two chromatids of each chromosome move toward the opposite poles in the spindle.

Meiosis II: Metaphase II. Chromosomes are accommodated in the equatorial plate of metaphase, similar to what happens in mitosis. They are attached to the already fully formed meiotic spindle. Each chromosome is aligned in the equatorial plate of the metaphase, as it happens in mitosis.

You might be interested in

The phrase “too large or too charged” is a helpful way to remember what kinds of molecules need to cross the cell membrane via a

saveliy_v [14]

Answer:

Due to their hole size.

Explanation:

Some molecules can pass directly through the phospholipid bilayer because of their small size which can easily pass through the small holes of phospholipid bilayer, while those that are too large or too charged need to pass through a membrane protein because membrane protein has a large holes through which large molecules can easily pass through the semi-permeable membrane of the cell by active or passive transport.

5 0

2 years ago

More than 75% of the total ocean floor is considered ____

kvv77 [185]

Deep ocean floor would be your answer :)

4 0

3 years ago

An element has a half-life of 30 years. If 20 mg of this element decays over a period of 90 years, how many mg of this element w

Vlada [557]

Answer:

2.5 mg

Explanation:

<em>The half-life of a substance is the time required for one half of the substance to decay. In order words, it is the time it will take for a substance to decay into half of its initial size.</em>

For a 20 mg element with a half-life of 30 which decays over a period of 90 years;

The first 30 years, 10 mg would have decayed, remaining 10 mg

The second 30 years, the remaining 10 mg would have decayed to 5 mg

The third 30 years, 5mg would have decayed to 2.5 mg.

Hence, in 90 years, 20 mg of the element would <u>remain only 2.5 mg.</u>

7 0

3 years ago

Insects is what level of classification

hoa [83]

Answer:

kingdom animalia ,class insecta

Explanation:

1.Because they have the body parts. 2.Have a pair of compound eyes and one pair of antennae

3 0

3 years ago

The functioning of enhancers is an example of _____.

shutvik [7]

Answer:

D) transcriptional control of gene expression.

Explanation:

Enhancers as the name indicates are required to enhance transcription of a gene. Enhancers are nothing but a small stretch of DNA which may be located either in upstream (mainly) or downstream region of a particular gene. If they are distantly located from a gene then in order to cause increased transcription of that gene they form a loop to reach near the promoter region of the gene. With the help of activators and transcription factors they can enhance the expression of gene at transcriptional level.

6 0

3 years ago