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QveST [7]
3 years ago
12

Why is the sickle cell allele still common in tropical regions?

Biology
1 answer:
slavikrds [6]3 years ago
3 0
Sickle-cell disease is common in tropical and sub-tropical regions because being a carrier, carrying a single sickle-cell mutation (sickle cell trait), affords some resistance to malaria.
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First person to Answer gets a Brainliest!!
noname [10]

Answer:

A) Chlorophyll absorbs sunlight energy for photosynthesis. :)

Explanation:

To quote Nat Geo:

"Chlorophyll’s job in a plant is to absorb light—usually sunlight. The energy absorbed from light is transferred to two kinds of energy-storing molecules" :)

6 0
2 years ago
Read 2 more answers
Congenital analgesia is a rare autosomal recessive trait. What is the likelihood that the first two offspring of a cross between
telo118 [61]

The likelihood that the first two offspring of the cross will have congenital analgesia would be 1/16

<h2>Autosomal Recessive Traits</h2>

For autosomal recessive traits, two recessive alleles are needed for the trait to manifest while one recessive allele means heterozygosity.

In this case, let us assume that congenital analgesia is represented by the allele b; heterozygous individuals will, thus, be Bb.

            Bb    x    Bb

          BB   Bb   Bb   bb

Probability of producing unaffected offspring = 3/4

Probability of producing affected offspring = 1/4

Likelihood of the first two offspring having congenital analgesia = probability of first having congenital analgesia and the second having congenital analgesia

    = 1/4 x 1/4

        = 1/16

More on genetical probabilities can be found here: brainly.com/question/851793?referrer=searchResults

6 0
2 years ago
Which of the following is not a characteristic of life?
valentinak56 [21]

Answer:

Change their external environment is the correct answer.

6 0
2 years ago
The sides of the DNA molecule the rails of the ladder are composed of
VashaNatasha [74]

The structure of DNA is double helix which looks like twisted ladder. The sides of the DNA molecule, the rails of the ladder are composed of alternate phosphate and sugar molecules.

7 0
3 years ago
Which of the following best explains how hydrogen bonding aftects the heat of vaporization for water?
dlinn [17]

Answer: A. The hydrogen bonds cause water to resist a change in temperature.

Explanation:

Heat of vaporization is defined as the amount of heat required to convert 1 mole of liquid to gaseous state.

Water has high heat of vaporization due to the presence of strong hydrogen bonds between  hydrogen and a electronegative element oxygen. As the water molecules are strongly bonded to each other, large amount of heat is required to raise the temperature of water.

The molecules will not be able to gain enough kinetic energy and thus temperature changes slowly.

5 0
3 years ago
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