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rusak2 [61]
3 years ago
13

Given what you know about the selective pressures associated with malaria and sickle-cell anemia in the tropical areas of sub-Sa

haran Africa, is there evidence of selection operating in this population? If so, which genotype appears to be favored? Explain.
Biology
1 answer:
julsineya [31]3 years ago
8 0

Answer

HBA HBs

Explanation:

In some parts of Africa, up to 20% of the population are carriers of the sickle cell gene. This suggests that the trait must have a survival value. The carriers of the trait have a much lower susceptibility to malaria than normal individuals. This is because the malaria parasite survives very poorly in sickled red blood cells.

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Which of the following is TRUE of a cell membranes?
adoni [48]

Answer:

B, C, Dand E are all correct

Explanation:

Why B is correct- The cell membrane, also known as the plasma membrane, is a double layer of lipids and proteins that surrounds a cell and separates the cytoplasm (the contents of the cell) from its surrounding environment. It is selectively permeable, which means that it only lets certain molecules enter and exit.

Plants, animals, and bacteria have a cell membrane. Why d is correcect

Why C is correct- The cell membrane is not a solid structure. It is made of millions of smaller molecules that create a flexible and porous container. Proteins and phospholipids make up most of the membrane structure.

Why E is correct- The plasma membrane is primarily composed of phospholipids arranged in a bilayer, with the hydrophobic tails on the interior of the membrane, and the hydrophilic heads pointing outwards

Why A Is Not correct- It is very fragile and its role is to hold the cell together and to help control what substances can get in and out. It is partially permeable, allowing only some substances to pass through it. The membrane has a complex structure consisting of a phospholipid bi-layer and different types of proteins.

4 0
3 years ago
Which of the following is a behavioral adaptation of the Venus fly trap?
Neko [114]


The correct answer is A - leaves that close when touched.

The Venus flytrap is a type of flowering plant that is best known for its unique adaptation to trap live insects using a trap.

The trap is made up of two hinged lobes at the end of each leaf, with hair like projections called trichomes that cause the lobes to snap shut when prey comes into contact with them.

This type of movement is called thigmonasty which is a non directional plant response to being touched.

8 0
3 years ago
Whta is fetilisation and what are the types of fertilisation
uysha [10]
The action or process of fertilizing an egg, female animal, or plant, involving the fusion of male and female gametes to form a zygote. The gametes that participate in fertilisation of plants are the sperm (male), and the egg cell, and in flowering plants a second fertilisation event involves another sperm cell and the central cell which is a second female gamete. In flowering plants there are two sperm from each pollen grain.
6 0
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1. Describe in your own words how competition may leads to natural selection.
Lynna [10]

bro this is so easy,

if to animals fight, the one more adapted, prepared or psychically built will win will the weaker one lose and die, which is natural selection at its finest.

8 0
3 years ago
Outline the biochemical pathways which enables cells to produce energy using glucose and oxygen
Eduardwww [97]

Cellular respiration is a metabolic pathway that breaks down glucose and produces ATP.

<h3>What is respiration?</h3>

Respiration is the process in which cells use oxygen to break down sugar in order to obtain energy. Glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation are the stages of cellular respiration.

So we can conclude that Cellular respiration is a metabolic pathway that breaks down glucose and produces ATP.

Learn more about cell here: brainly.com/question/13123319

8 0
2 years ago
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