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Ipatiy [6.2K]
3 years ago
10

What can lead to scientists to change an evolutionary tree?

Biology
1 answer:
sergij07 [2.7K]3 years ago
7 0
New molecular evidence
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Hot spots, Divergent plate boundaries and Convergent plate boundaries

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Which organ maintains homeostasis by regulating the amount of sugar in the blood
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There is also a corresponding diffusion of Chinese and Japanese's forms along this zone 
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In genetic diseases like Down syndrome, the cause is often due to the presence of an extra chromosome. Do you think this mutatio
grigory [225]

Answer:

meiosis

Explanation:

Down syndrome is an abnormality that occurs on chromosomes 21, it occurs because chromosomes 21 cannot be separated in meiosis, the pair of chromosomes 21 do not separate and go together to one of the daughter cells. In this way, the oocyte or the resulting sperm will have 24 chromosomes instead of 23. When in conception that oocyte or sperm joins the germ cell of its partner that contributes the 23 chromosomes, the total sum of chromosomes that will have the first cell of the new conceived being will be 47.

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4 years ago
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A gene exists in two alleles, which we will call B and b. The gene is 1123 bp in length, and the B and b alleles exhibit single
Hitman42 [59]

Answer:

The below options will complete the question

Select one:

a. Gap repair synthesis

b. Mismatch repair

c. Direct repair

d. Nucleotide excision repair

Our answer is surely A.

a. Gap repair synthesis

Explanation:

Alleles of gene B differ by 6 bps and are seeming close to each other among the 1123 bp within the particular gene, favouring the gap repair synthesis.

In the gap repair synthesis, a double stranded break is formed at a homologous chromosome with a small part of the gene or the 6 bps of the recessive allele

being digested away.

Strand invasion and a D-loop formation is followed by the new region being occupied by the dominant B allele to yielding dominant B allele in both chromosomes.

The gap repair synthesis allows the 6bps to be converted to the dominant B from the recessive b when in proximity/being close together.

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3 years ago
What structure is missing in a animal cells but present in almost all other all types
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The cell wall because of the fact it is present in the plant cell and not in the animal cell
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