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valkas [14]
3 years ago
11

What are the nitrogenous bases found in dna?

Biology
1 answer:
REY [17]3 years ago
6 0
<span> Adenine, Guanine, Thymine, and Cytosine :)</span>
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The population in South Africa is more prone to sickle cell anemia (genotype "ss"). People with genotype "ss" survive only up to
lions [1.4K]
The answer is stabilizing selection.

<span>Sickle-cell anemia is a recessive disorder caused by the presence of two recessive alleles "s", so genotype is "ss". This disorder is characterized by sickle hemoglobin. In an area with malaria, heterozygous individuals "Ss" (with one dominant allele and one recessive allele) have an advantage. These individuals will have both normal and sickle hemoglobin. But pathogen that causes malaria affect only normal hemoglobin, so heterozygous individuals will have half of the hemoglobin resistant to the pathogen and those individuals are resistant to malaria.</span>

Stabilizing selection favors heterozygotes Ss,  disruptive selection favors dominant (SS) and recessive (ss) homozygotes, while directional selection favors dominant (SS) or recessive (ss) homozygote. Since in this example, people with genotype Ss (heterozygotes) are in advantage, then this is an example of stabilizing selection.

7 0
3 years ago
An image is shown here where a strand of mRNA is modified by spliceosome activity after it is transcribed. Which statement accur
vazorg [7]

Answer: The answer is B,C,D

Explanation: Because it’s right ;)

8 0
3 years ago
During replication and transcription, the DNA unzips the
Pepsi [2]
It has been a while since biology...but if there is one thing I definitely remember, it is the replication process of DNA.

Once the cell is ready to commence the process of replication, it begins by unzipping the double helix. This task is completed by an enzyme called the DNA Helicase. Then a DNA Polymerase takes half of the unzipped DNA strand and creates corresponding deoxyribonucleotides.

Hope I could help! Have a good one. 
4 0
3 years ago
A Biologia Celular, também chamada de Citologia, é a parte da Biologia relacionada com o estudo das células, as estruturas funda
strojnjashka [21]

Answer:B

Explanation:

TENHA UM DIA ABENÇOADO

3 0
3 years ago
1. List the levels of biological organization in order.
ycow [4]

Answer:tissue

Explanation:

Tissues are groups of cells that have a similar structure and act together to perform a specific functio”. ... Groups of tissues make up organs in the body such as the brain and heart.

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3 years ago
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