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Black_prince [1.1K]
3 years ago
14

Describe geographical isolation and competition

Biology
1 answer:
zmey [24]3 years ago
3 0
Geographical isolation usually refers to <span>two populations of the same species being separated due to some type of physical barrier. This separation of population </span>occurs<span> when a body of water or land forms and divides a habitat. </span>Geographic isolation<span> of a species also can </span>occur<span> when animals migrate to an isolated island.</span>
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With incomplete dominance a likely ratio of phenotypes in the F2 generation resulting from a monohybrid cross between two true-b
nydimaria [60]

Answer:

A) 1:2:1

Explanation:

Incomplete dominance is an effect observed in the organisms in which the neither of the two alleles controlling a trait is dominant or recessive instead produces a phenotype formed by the mixture of the effect of the two alleles.  Therefore in incomplete dominance, a new trait is produced which is formed by both the alleles.

In the given question, if incomplete dominance is observed in a monohybrid cross which results in two homozygous genotypes and two heterozygous genotypes. In F2 the phenotypic generation produced will be 1:2:1 as the heterozygous genotype will form a new phenotype.

Thus, Option-A is the correct answer

4 0
2 years ago
The body determines whether certain genes should be expressed or not. Sometimes genes are only turned on once or twice in a life
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The gene which is produced once or twice in a lifetime is the milk producing hormone after childbirth. This is because it is produced only after the birth of the child. The growth of the mammary glands takes place during pregnancy. The breast continue to increase in size after giving birth to a child. After delivery only copious milk is produced which is generally done with the help of milk hormone. During pregnancy the secretion of the milk is inhibited by the estrogen and progesterone which circulates in the blood stream which in turn inhibits the release of prolactin from the pituitary gland thus making the mammary glands unresponsive. Where as insulin is a hormone which helps the body to utilise the sugar or glucose from different sources like carbohydrates that we get while we eat food and adrenaline is secreted when we are scared or when we feel that we are in danger. Therefore, milk producing hormone is the gene that are turned once or twice in a lifetime.

8 0
2 years ago
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The scientific process usually begins with a(n):
sasho [114]
The answer is Observation. That's the first step. 
8 0
2 years ago
Which model is most likely used to show something that happens too slowly to see?a model of a weather systema model of mountain
MatroZZZ [7]

Answer:

a model of mountain formation ( second choice)

6 0
3 years ago
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Which of the following are possible treatments for multiple sclerosis? There may be more than one correct answer. Which of the f
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Answer:

--Block immune cells from crossing the blood brain barrier.

--Stimulate the regeneration of myelin.

Explanation:

Multiple sclerosis or shortly known as MS is an unpredictable disease caused in the humans. Multiple sclerosis affects the central nervous system of our brain which causes the disruption in the flow of the information within our brain, and between our brain and the body.

It is a very rare disease.

The symptoms of MS may vary and includes double vision, weakness, fatigue, impaired coordination, pain, etc. Though there is no permanent cure for MS but scientist and doctors around the world suggest that by blocking the immune cells and stopping them from crossing our blood brain barrier can prevent this disease.

Multiple sclerosis can also be prevented by stimulating the myelin to regenerate.

8 0
3 years ago
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