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Amanda [17]
3 years ago
5

How does fertilization affect the chromosome number of a zygote?

Biology
1 answer:
olya-2409 [2.1K]3 years ago
4 0

Answer:

Fertilization is the fusion of gametes to form the zygote. ... Fertilization allows restoring of the chromosome number of the species as the two nuclei of gametes fuse together. Therefore, the number of chromosomes in the zygote is twice the number of chromosomes in gametes.

Explanation:

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A woman produces an egg with 24 chromosomes, including 2 copies of chromosome 21. If the egg is fertilized by a normal sperm, th
Zielflug [23.3K]

Answer:

47

Explanation:

We all know that gametes like egg cell and sperm have haploid set of chromosomes but here as per this question she has produced 2 copies of chromosome 21. For the sake of maintaining haploidy, she was supposed to have only a single copy of chromosome 21 as a result of which her egg cell was supposed to have 23 chromosomes not 24.

But, this is a case of non dis-junction. Also, in a normal sperm there are no such copies of any chromosome i.e. there is a haploid set of chromosomes. It means that sperm must be having only 23 chromosomes. So we can easily infer that when the egg cell and sperm will fuse, the zygote will have 47 chromosomes (24 from egg cell and 23 from sperm).  

6 0
3 years ago
Which of the following would be most affected by a change in the atmosphere?
Monica [59]
Pressure would be my best guess, since no choices were given.
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What is arificial selection?
Ratling [72]

The answer to your question is c.

5 0
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Immune system cells enter a resting phase after undergoing mitosis. When activated by an infection for example, they can reenter
Leni [432]

Answer:

G, S, G2, M

Explanation:

Cell cycle refers to the orderly events that prepare the cells for cell division and finally divide the parent cells into the daughter cells. The cell cycle consists of two stages: interphase and M phase.  

Interphase is the phase wherein cells prepare to enter the M phase. Interphase has three stages: G1, S, and G2.

G1 is the first gap between represents the time between the end of mitosis and the beginning of the S phase. During the G1 phase, normal growth and metabolism take place. G1 phase is followed by the S phase, the synthesis phase, during which DNA replication and synthesis of histone proteins occur.  

The cells then enter the G2 or the second gap during which cells synthesize more proteins and prepare to enter the M phase.  

M phase is the phase of nuclear division that divides the nucleus of the parent cell into 2 or 4 daughter nuclei (depending on the type of the cell division that the parent cell has entered).

Therefore, the sequence of the stages that the cell will go through is G, S, G2, and M.  

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Which predator is typically found in Central Africa
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Most probably a king cobra snake, which originates from yes Central Africa, especially in Kenya.
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