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Artist 52 [7]
2 years ago
14

How have the historic levels of melanin in human populations changed due to migration? (1 point)

Biology
1 answer:
MaRussiya [10]2 years ago
4 0

Answer:

i would say A

Explanation:

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An Electron microscope

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True or false Ribosomes are made in a special region of the nucleus called the nucleolus
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Name the earth’s five major environmental spheres and state the defining characteristics of each
Ilya [14]
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1. Lithosphere
2. Hydrosphere
3.atmosphere
4. Biosphere

The lithosphere/geosphere is made of the earth's core, the mantle, crust, ocean floor,mountains, sand, etc.The hydrosphere is made of everything water such as oceans, rivers, lakes, rain, and snow.The atmosphere is made of gasses such as oxygen, and hydrogen.Finally the biosphere is all that has life such as plants, animals, people, insects, etc.
3 0
2 years ago
The germ cell has 2 sets of chromosomes, and the four gametes will each have one set of chromosomes. ​​​​​​​ To have enough DNA
ICE Princess25 [194]

Answer:

This question lacks options, the options are:

A. Halved

B. Doubled (x2)

C. Quadrupled (x4)

D. Octupled (x8)

The answer is B.

Explanation:

Via the process of meiosis, gametes are formed in order for sexual reproduction to occur. However, the chromosomal content of the gametes are reduced by half. According to this question, a germ cell is said to have 2 sets of chromosomes i.e. diploid, meaning that each daughter cell after meiosis will have one set of chromosome (haploid, n).

However, before any form of division can occur, the DNA (genetic material) of the cell must be replicated i.e. doubled in order to ensure that each resulting gamete has enough chromosomes. This is applicable in this question as well as the DNA in the germ cell must be DOUBLED (×2) via replication in order to have enough DNA for each gamete.

4 0
3 years ago
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