1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Neko [114]
2 years ago
10

PLEASE HELP

Biology
1 answer:
lesya [120]2 years ago
7 0

Answer:

Evolution is the process by which populations of organisms change over generations. Genetic variations underlie these changes. Genetic variations can arise from gene variants (also called mutations) or from a normal process in which genetic material is rearranged as a cell is getting ready to divide (known as genetic recombination). Genetic variations that alter gene activity or protein function can introduce different traits in an organism. If a trait is advantageous and helps the individual survive and reproduce, the genetic variation is more likely to be passed to the next generation (a process known as natural selection). Over time, as generations of individuals with the trait continue to reproduce, the advantageous trait becomes increasingly common in a population, making the population different than an ancestral one. Sometimes the population becomes so different that it is considered a new species.Not all variants influence evolution. Only hereditary variants, which occur in egg or sperm cells, can be passed to future generations and potentially contribute to evolution. Some variants occur during a person’s lifetime in only some of the body’s cells and are not hereditary, so natural selection cannot play a role. Also, many genetic changes have no impact on the function of a gene or protein and are not helpful or harmful. In addition, the environment in which a population of organisms lives is integral to the selection of traits. Some differences introduced by variants may help an organism survive in one setting but not in another—for example, resistance to a certain bacteria is only advantageous if that bacteria is found in a particular location and harms those who live there.So why do some harmful traits, like genetic diseases, persist in populations instead of being removed by natural selection? There are several possible explanations, but in many cases, the answer is not clear. For some conditions, such as the neurological condition Huntington disease, signs and symptoms occur later in life, typically after a person has children, so the gene variant can be passed on despite being harmful. For other harmful traits, a phenomenon called reduced penetrance, in which some individuals with a disease-associated variant do not show signs and symptoms of the condition, can also allow harmful genetic variations to be passed to future generations. For some conditions, having one altered copy of a gene in each cell is advantageous, while having two altered copies causes disease. The best-studied example of this phenomenon is sickle cell disease: Having two altered copies of the HBB gene in each cell results in the disease, but having only one copy provides some resistance to malaria. This disease resistance helps explain why the variants that cause sickle cell disease are still found in many populations, especially in areas where malaria is prevalent.

Explanation:

hope this helped!

You might be interested in
WORTH 10 POINTS AND WILL GIVE BRAINLIEST FOR CORRECT ANSWER!!!<br> Order the following!
gulaghasi [49]
1) RNA polymerase finds the promoter sequence on DNA.
2)RNA polymerase reads the DNA and builds complementary sequence.
3) Intron séquences are spliced out and exons are joined together.
4) The ends of the mature transcript are protected before it leaves the nucleus.
5) The mRNA attachés to the ribosome.
6) transfer RNA arrives at the ribosome and the anticodon complements to the mRNA codon.
7)amino acids form peptide bonds as tRNA molecules match the mRNA.
5 0
3 years ago
How many grains of pollen does it take to fertilize an egg in a flower?
PolarNik [594]

it only need one to fertilize a egg in a flower

6 0
3 years ago
Read 2 more answers
_____ helps prevent mutations from occurring over and over again.
erica [24]

Answer:

Meiosis

Explanation:

3 0
2 years ago
Biologists want to increase the number of animals in a population. They suggest that if a minimum number of animals are protecte
Yuliya22 [10]

Answer:E establishing wildlife management areas

Explanation:

If you're on Plato that's what I put and it said it was correct

8 0
3 years ago
Wave energy is a. Another name for tidal energy. C. A clean, renewable resource. B. Used around the world. D. Run by computer pr
Mumz [18]

Answer:

A; another name for tidal energy

Explanation:

The wave energy comes from the movement of the sea or ocean tides.

It is the energy that can be obtained from the movement of the tides of the ocean or sea.

It is the energy that we can get as a result of the rise and progression including the retraction and fall of the sea waves.

6 0
2 years ago
Other questions:
  • This is a scaffolding of protein fibers that help a cell keep its shape, and assist cell division and cell movement.
    15·2 answers
  • What does the chloroplast produce during the light-independent reactions of photosynthesis?
    5·2 answers
  • When two atoms share a pair of electrons, the bonding is referred to as
    7·1 answer
  • In algae and plants, photosynthesis happens in the
    10·2 answers
  • A ___Len is used in a magnify glass
    11·2 answers
  • Summarize how the functions of organelles in animal cells and plant cells are the same and different.
    11·1 answer
  • Definiton of crossing over
    13·2 answers
  • Filtrate becomes less concentrated as it flows down the medullary collecting ducts, toward the renal pelvis.
    9·1 answer
  • Which is a part of interphase?
    10·1 answer
  • Help please ASAP I need this answer
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!