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Kobotan [32]
3 years ago
5

3. Animals can develop illnesses from bacterial infections. Antibiotic medications are sometimes prescribed to treat these infec

tions. What do you think might happen to a population of bacteria that is exposed frequently to such antibiotics? ​
Biology
1 answer:
charle [14.2K]3 years ago
6 0

Answer:

it could mutate to where the antibiotic no longer works

Explanation:

its fairly simple if a medicine, antibiotic in this case  is not changed over time then the thing it is fighting will learn how to ignore it to where it no longer works as the species adapt and change the antibiotics must to otherwise there will be no effect.

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Blood pressure gradient 
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Anybody know any pros and cons about spaceX’s environment
Eduardwww [97]

Answer:

Pros

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3 years ago
Una mujer lleva en uno de sus cromosomas X un gen letal recesivo (l), y en el otro alelo dominante normal (L). ¿Cuál es la propo
nlexa [21]

Question in English:

A female carries a recessive lethal gene (l) on one of her X chromosomes, and a normal dominant allele (L) on the other. What is the sex ratio to be expected in this woman's dependency if she marries a normal man?

Answer:

2/3 females

1/3 males

Explanation:

Females have two X chromosomes (XX) and males have an X and a Y chromosome (XY).

The genotype of the female is XLXl. The genotype of the male is XLY, since he is normal.

The possible genotypes are:

<u>                            XL                  Xl</u>

<u>XL</u>                     <em>XLXL             XLXl</em>

<u>Y</u>                       <em>XLY               </em><em>XlY</em>

<em />

All female offspring will be normal as they will always have one normal copy of the X chromosome from their father.

50% of the male offspring will be normal, but 50% will inherit the lethal gene from their mother.

Because the allele is lethal, that means XlY males will not be born.

That means 2/3 of the children will be females, and 1/3 will be males.

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