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Bingel [31]
3 years ago
7

Who gave the concept of vaccine and immunization?​

Biology
2 answers:
n200080 [17]3 years ago
8 0

Answer:

Edward Jenner

Explanation:

lana66690 [7]3 years ago
7 0
The first person to introduce that concept was Edward Jenner
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During the industrial revolution in England, a population of light-colored moths population fell while a population of dark-colo
Rzqust [24]

Answer:

A

Explanation:

The darker moths would be harder for the bird to see due to the amount of soot on the trees. The darker moth population would thrive and continue to grow, while the lighter colored moth population would decrease.

6 0
3 years ago
Please explain the difference between a frameshift mutation and a base substitution mutation.
harina [27]

Answer:

A frameshift changes every codon past it. A base substitution only changes one codon.

Explanation:

DNA is comprised of nucleotides (A, C, T, G) that make up amino acids. Every three bases is called a codon and represents an amino acid.

In a frameshift mutation, a nucleotide is either added or deleted from the sequence. This offsets the entire sequence after it because the reading frame shifts. Here's an example:

ACTGCTATCGTCATC

If another T is added in between the first and second codons, then every codon after will be changed.

ACT>T<GCTATCGTCATC

A substitution mutation is usually less severe, as it only alters one codon in the sequence. These occur when one nucleotide is replaced by another one. Here's an example:

ACTGCTATCGTCATC

Let's say the first G is replaced by a T.

ACT>T<CTATCGTCATC

As you can see, none of the other codons changed.

Typically, a frameshift mutation is considered worse than a substitution mutation.

7 0
3 years ago
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Recessive traits are...
gulaghasi [49]
Recessive traits are visible in the organisms phenotype as long as TWO recessive traits are present.
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gladu [14]
Humans obtain nitrogen by eating other organisms.
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2 years ago
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What are two examples of nucleic acids?
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Answer:

deoxyribonucleic acid and ribonucleic acid

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