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Ivahew [28]
2 years ago
14

I need help please! Thank you guys

Biology
1 answer:
IRISSAK [1]2 years ago
7 0

Answer:

B

Explanation:

a vestigial structure is something that was needed before but is not needed now but remains due to evolution

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How does polygenic inheritance differ from mendelian inheritance
Luba_88 [7]

Answer:

Mainly, the number of genes that control traits.

Explanation:

Polygenic inheritance does not follow Mendel's law of dominance. According to Mendel the dominant trait will mask the recessive trait however, this is not always the case. Polygenic inheritance states that traits are controlled by two or more genes and is also dependent on the environment.

Let's take skin color for example. A fair-skinned person will have a child with a dark-skinned person.

Mendelian inheritance would assume that the offspring would either be fair or dark only.

Polygenic inheritance would assume that the offspring would be either fair, dark, or a tone in between, depending on the environment they are in as well.

Hope you understood it.

7 0
2 years ago
Human populations in low-UV environments tend to have more lightly pigmented skin. One explanation is that the selective pressur
nikdorinn [45]

Answer:

Lightly pigmented people tend to be at higher risk of vitamin D deficiency

Explanation:

BACKGROUND KNOWLEDGE:

Human skin is the largest organ of the body which makes boundary line between environment and internal conditions.  Human skin cell produces pigment called melanin when ever it is subjected to Sun. More the melanin pigment produced more will be the skin darkens. Ultraviolet (UV) radiations also come from Sun and responsible for more pigmentation.

ANSWER EXPLANATION:

According to the question darkly pigmentation only occurs when their is high level of UV radiations. High level of UV radiations are also responsible for Vitamin D production.

People with lightly pigmented means that there environment has low level of UV radiations which are the requirement of Vitamin D production. Hence due to low UV radiations peoples with light pigmentation's are also be at higher risk of vitamin D deficiency

7 0
3 years ago
Which is TRUE about the footslope landscape position?
Nutka1998 [239]

Answer:

C

Explanation:

6 0
2 years ago
Read 2 more answers
Convenient current affect the movement of plates in the earths crust t or f
Jlenok [28]

Convection currents in magma drive plate tectonics. The answer is true.

8 0
3 years ago
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Paraphrase four safety practices you should always use when you begin scientific inquiry
vovikov84 [41]
Scientific inquiry is asking a question about the world and finding out an answer or explanation in order <span>to develop explanations of natural phenomena in a continuing and creative process. It is very important to follow safety rules during every scientific inquiry:
</span><span>1.Do not taste, touch, or smell substances unless directed to do so.
</span><span>2.Wear safety glasses and other required safety equipment.
</span><span>3. Keep the lab area, including table top and walkways, clear of unnecessary items.
4. </span>H<span>andle all equipment carefully and as directed.</span>
8 0
3 years ago
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