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Liono4ka [1.6K]
3 years ago
5

U

Biology
1 answer:
poizon [28]3 years ago
7 0
Slightly basic is the anwser
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What is represented by the base root of a phylogenetic tree?
xz_007 [3.2K]

the third one that says

evolution of populations over time

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Pigmented eyes (P) are dominant to non-pigmented (p), and dimpled chins (D) are dominant to Non-dimpled chins (d). A pigment-eye
Ivenika [448]

Answer:

PpDD and PpDd

Explanation:

Pigmented eyes (P) are dominant to non-pigmented (p), and dimpled chins (D) are dominant to Non-dimpled chins (d).

The <u>possible genotypes of a pigment-eyed, dimple-chinned person</u> would be  PPDD, PpDd, PPDd, PpDD while a blue-eyed person without a dimpled chin would have the genotype ppdd.

The genotype of a blue-eyed, dimpled chin child would be either of ppDd or ppDD, but in this case, the mother is ppdd and as such, the child cannot have two copies of D allele. Hence, the genotype of the child can only be ppDd.

In order for the child to have blue eyes (pp), it means that the father has to have the non-pigmented allele (p). This also means that the father is heterozygous for eye pigmentation (Pp).

<em>Hence, the genotype of the father is now limited to </em><em>PpDD</em> <em>and </em><em>PpDd</em>.

8 0
2 years ago
Match the organ to the number showing the order of blood flow in the circulatory system.
trasher [3.6K]

Answer:

What sends oxygenated blood back to the heart from the lungs?

Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. Oxygen-rich blood then flows through the mitral valve (MV) into the left ventricle (LV), or the left lower chamber.

Explanation:

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3 years ago
Name two strategies of human body defence system​
marshall27 [118]

Answer:

You have external defense systems, which include your skin, tears, mucus, saliva, stomach acid, cilia (small hairs) and helpful bacteria. The skin, nails and hair form the integumentary system, which stops dirt and pathogens from entering the body.

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nitrogen gas reacts with hydrogen gas to form ammonia. what are the reactants in this chemical reaction
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N2 +3 H2 ---> 2NH3

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