BIOLOGY HIGH SCHOOL

A malaria outbreak causing allele frequencies to change is an example of:nonrandom mating.

the bottleneck effect.

genetic drift.

natural selection.

differential migration

Answers

Answer 1
Answer:

Answer:

The correct answer would be natural selection.

Natural selection favors the survival and reproduction of the organisms which are better adapted to the environment.

It gradually changes the allele frequency or heritable characters of a population over the generations.

Similarly, during malaria outbreak organisms which are better adapted or resistant against the disease will survive and reproduce successfully. It will increase the frequency of allele associated with resistance or adaptation against malaria.

For example, the carriers of the sickle cell anemia show protective advantages against malaria.


Answer 2
Answer:

The correct answer is option D, Natural selection.

The survivors within a population attacked by malarial mosquito are the individuals which have high rate of survival and reproductive rates as compared to others. The genetic qualities of these individuals have proved to be beneficial in their survival and thus their future generations consists of individuals which are able to survive in the harsh environmental conditions. This mechanism of survival of the fittest is known as natural selection.

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Which method would allow you to study the behavior of a tiger in its native habitat in India?

Answers

They are solitary animals, especially males who do not live in groups, unlike the female which can form small groups of three or four members with their young.

The males are very territorial, so take care of their personal space and the females with whom they mate. To mark their territory, they spray the trees and rocks with a mixture of urine and musk.

Both male and female, they are related only in times of mating and reproduction. There have been cases where the male is responsible for feeding breeding if the mother has died.

The gestation period lasts between 98 and 108 days and give birth to two to four cubs weighing just over a kilo. They have a short life expectancy, as only get to live 10 to 12 years in the wild, but in captivity Natural mortality manage to live up to 26. It is mainly due to the fighting between males

What is the power house of the cell called

Answers

The Mitochondria is the powerhouse of the cell.

Which of the following is not true about sedimentary rocks? a. They are formed through compaction and cementation. c. They are formed from igneous rock fragments. b. They are made up of sediments. d. They are not part of the rock cycle.

Answers

Answer:

D Because it is wrong

Explanation:

Which of the following is the most common type of hydrolysis damage in the cell?A. deamination of thymidineB. breakage of the glycosidic linkage between the pyrimidines and the DNA backboneC. removal of cytosine from the DNA backbone to create an abasic siteD. deamination of cytosine to uracilE. None of the damage types given is known to occur in cells.

Answers

Answer:

D. deamination of cytosine to uracil

Explanation:

Hydrolytic DNA damage is usually a consequence of metabolic reactions and the most common example of this type of damage is hydrolysis of cytosine into uracil with the release of ammonia. This damage can be fixed by the cell's DNA repair system:removal of uracil  by an enzyme uracil-DNA glycosylase and consequently generation of an abasic (AP) site.  AP endonucleases recognise AP site and break a phosphodiester bond so that lesion can be replaced with another cytosine.

What type of pressure system is represented by the L on this map, and what kind of weather is a likely result?A.
high pressure; cloudy or rainy weather

B.
high pressure; sunny weather

C.
low pressure; sunny weather

D.
low pressure; cloudy or rainy weather

Answers

The answer would be :  B. High pressure ; sunny weather
air tends to sink near the high-pressure centers, which affected the and somehow prevent cloud formation. Which is why this system tend to bring sunny days

hope this helps

Give four causes of mutation

Answers

- DNA codes fail to match accurately.

- The environment.

- Disclosure to chemical or radiation. 

-  Mistake in the cellular machinery
Exogenous factors: environmental factors such as sunlight, radiation, and smoking can cause mutations. Endogenous factors: errors during DNA replication can lead to genetic changes as can toxic by-products of cellular metabolism.
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