1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lozanna [386]
3 years ago
15

Meiosis occurs in a series of different phases and creates genetically unique reproductive cells. mc012-1.jpg Which process help

s make meiotic cells genetically different and occurs during prophase I, but not during prophase II?
A)fertilization,(B)independent assortment,(C)crossing over, (D)chromosome replication
Biology
2 answers:
DIA [1.3K]3 years ago
7 0
Meiosis occurs in a series of different phases and creates genetically unique reproductive cells. The process which helps make meiotic cells genetically different and occurs during prophase I, but not during prophase II, is crossing over (C). Crossing over is the exchange of genetic material between two homogenous chromosomes. It is one of the final phases of prophase I. This process is called synapsis. It occurs when the matching regions on the matching chromosomes break and then reconnect to the other chromosome
dexar [7]3 years ago
3 0

The process of crossing over takes place in prophase I and creates genetic diversity in the meiotic cells whereas prophase II is devoid of any such process.

Further Explanation:

The type of cell division which helps in gamete production is meiosis. It starts with prophase I in which the cell contains duplicated chromosomes. The chromosome duplication occurs during interphase which is followed by prophase I.

In the prophase I, the homologous chromosomes align with each other resulting in a tetrad formation. As the chromosomes line up, the genetic material is interchanged between the chromosomes. This is called crossing over which allows the formation of genetically unique daughter cells during the process of meiosis. Crossing over enhances the genetic diversity among the chromosomes as the hybrid chromosomes formed after crossing over have unique patterns. During crossing over, synapse occurs which is the pairing of two homologous chromosomes. A crisscross structure is formed between the two non-sister chromatids. It is the point of contact where the genetic exchange takes place to form new combinations of alleles.

As the crossing over completes, the homolog pairs move towards the center of the cell or alignment and this stage is called metaphase I. The pairs separate during anaphase I and migrate to their respective poles keeping the sister chromatids together. By the end of the telophase I, two new haploid cells are formed.

As the meiosis II proceeds with prophase II, no chromosome duplication takes place. The chromosome condenses followed by the breakdown of the nuclear envelope. The spindle formation occurs and the microtubules bind to the chromosomes. The chromosomes containing the sister chromatids line up during metaphase II at the center and gets separated in the anaphase II. Finally, at the telophase II daughter cells are formed which are four in numbers with each containing different sets of chromosomes as a result of random segregation or crossing over.

Learn more:

  • Learn more about the treatment of eukaryotic cell with a drug brainly.com/question/10767798
  • Learn more about the proteins synthesis in a cell brainly.com/question/1420458
  • Learn more about exchange of gases by blood cells brainly.com/question/1213217

Answer Details:

Grade: High School

Subject: Biology

Chapter: Meiosis

Keywords:

Meiosis, prophase, metaphase, anaphase, telophase, crossing over, chiasmata, synapse, sister chromatids, non-sister chromatids, homologous chromosomes, chromosomes, alleles, genetic diversity, genetic variation, chromosome duplication.

You might be interested in
This plant cell has an angular shape, unlike an animal cell, which is rounded. What two plant cell features help give this cell
Sauron [17]
You know that there is a difference between plant cells and animals cells. The plant cells have a cytoplasm while the animal cells do not. Therefore the answer must be C.
6 0
3 years ago
Read 2 more answers
Protein malnutrition can result in a moderate anemia. which of the below-listed vitamins would be most likely to be associated w
damaskus [11]
Anemia is a medical condition in which there is a decrease int the total amount of red blood cells in the blood and it always results in lowered ability of the blood to carry oxygen. Vitamin B12 is needed to make red blood cells and lack of Vitamin B12 can lead to aneamia. So, the vitamin that is most associated with aneamia condition is VITAMIN B12.
5 0
3 years ago
A large family has a history of multiple aneuploid diseases such as Down Syndrome, trisomy-18 and Klinefelter Syndrome (XXY). Th
SpyIntel [72]

Answer:

Genes coding for proteins involved in chiasma formation.

Explanation:

Chiasma is the connecting link between two non sister chromatids from homologous chromosomes. At chiasma chromosomal crossover takes place in which the genetic material is exchanged between the chromatids. During meiosis aneuploidy occurs if chiasma is absent or impaired due to a mutation in genes encoding for proteins involved in chiasma formation.

Aneuploidy is characterised by presence of abnormal number of chromosomes in cells. They can be 45 or 47 in number apart from the usual 46. Due to impaired chiasma, chromosome pair fails to separate and is passed on to the egg or sperm as it is hence there is one gamete with an extra chromosome and one gamete with a less chromosome. Aneuploidy can result in many genetic disorders like three copies of chromosome 21 can result in Down syndrome.  

5 0
3 years ago
If a cell culture has 3 x 105 cells per ml , and the culture flasks hold 75 ml of culture each and you have 12 flasks, how many
natta225 [31]

There are 27 x 10⁷ cells in total for the given conditions of cell culture.

Since it is given that the cell culture contains 3 x 10⁵ cells per ml and there are 12 culture flasks in total. It is also given that each of the culture flask holds 75 ml of culture.

Therefore, to calculate the total capacity of the flasks the total number of flasks should be multiplied with the individual capacity of a flask:-

75 x 12 = 900 ml

Now, in order to calculate the total number of cells in the given culture., the total capacity of the flasks i.e. 900 ml should be multiplied with 3 x 10⁵ cells per ml in the following manner:-

900 x (3 x 10⁵) = 2700 x 10⁵ = 27 x 10⁷ cells

To learn more about cell culture here

brainly.com/question/1005896

#SPJ4

4 0
1 year ago
What 3 factors determine cell "readiness" for mitosis?
goldfiish [28.3K]

Answer:

Chromosomes must still be copied.

the cell must double in size.

the nuclear DNA must double.

Explanation:

7 0
3 years ago
Other questions:
  • Propose a question that a scientist might ask about the variety of organisms found around deep sea vents
    7·1 answer
  • If the "free" water molecule concentration outside of a cell is higher than that inside the cell, the solution outside of the ce
    15·1 answer
  • Which of the following describes the way heat is transferred in a geyser? Conduction; magma near the surface heats water trapped
    13·2 answers
  • Can someone help me with this. I´ll give you the BRAINLEST!!
    10·2 answers
  • At the beach, John noticed that much of the sand had been eroded by the wind.
    15·1 answer
  • Biology Grade 8
    13·1 answer
  • Which labeled part in the photo shows an induced magnet?
    13·1 answer
  • Cells from different parts of an organism have varying<br> and
    12·1 answer
  • What is the process called ?
    9·2 answers
  • Help pls will give brainliest
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!