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MatroZZZ [7]
3 years ago
7

Human mutations may increase resistance to some infectious diseases. Humans which carry the mutant gene, the "sickle cell allele

" , may be more resistant to death caused by _____________- and humans which carry the cystic fibrosis allele may be more resistant to death caused by _________________
Biology
1 answer:
lys-0071 [83]3 years ago
4 0

Answer:

1 - Malaria

2- Typhoid fever and Tuberculosis

Explanation:

In case of malaria, the causal microorganism is Plasmodium falciparum, which target red blood cells of host. In humans who have defective sickle cell allele, have abnomral shaped red blood cells. So microorganism does not able to attach to abnormal shaped RBCs thus humans having sickle cell allele are more resistant to death caused by malaria.

In cystic fibrosis, mutation on that gene which encodes a protein known as cystic fibrosis transmembrane conductance regulator (CFTR).

Normally Salmonella typhi (bacteria responsible for typhoid fever) enters into intestinal cells by attaching with CFTR receptor. Carriers of cystic fibrosis mutant gene, have abnormal CFTR thus reduced rate of entry of bacteria into carriers.

Normally Mycobacterium tuberculosis (bacteria responsible for tuberculosis) adds sulfate in its cell walls. In carriers of cystic fibrosis, arylsulfatase B activity is reduced which incorporates sulfate. Thus reduced arylsulfatase activity makes bacteria unable to add sulfate in its cell walls thus decreases their virulence to carriers of cystic fibrosis.

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One sperm fertilizes the egg cell forming a diploid zygote, the other sperm fuses with the two polar nuclei forming a triploid cell that develops into endosperm 

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In guinea pigs, the allele for black fur (B) is dominant over the allele for brown (b) fur. A black guinea pig is crossed with a
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Answer:

  • G1: One copy of the B allele per cell
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Explanation:  

Due to technical problems, you will find the complete explanation in the attached files

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7 0
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PLEASE HELPPPPP!!!!! The law of conservation of mass states that the mass of all the substances present before a chemical change
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Use the vingear and baking soda experiment but change it to lemon and not vingear.

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A chemical reaction takes place when vinegar and baking soda are mixed. One of the new substances formed is carbon dioxide gas. If the carbon dioxide gas is contained, the mass of the substances will stay the same according to the Law of Conservation of Mass. If the gas is allowed to escape, the mass will be less

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Rama09 [41]

Answer:

Neurospora.

Explanation:

Beadle and Tatum experiment shows one gene one enzyme hypothesis. According to this, a single enzyme is encoded by each gene. This idea is not accepted in today's world.

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Thus, the correct answer is option (c).

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