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Kisachek [45]
2 years ago
14

Evolution is one of the unifying themes of biology. Evolution involves change in the frequencies of alleles in a population. For

a particular genetic locus in a population, the frequency of the recessive allele (a) is 0.4 and the frequency of the dominant allele (A) is 0.6.
Identify a particular environmental change and describe how it might alter allelic frequencies in this population. Explain which condition of the Hardy-Weinberg principle would not be met.
Biology
1 answer:
lapo4ka [179]2 years ago
3 0

A Mutation occurring in the population will change the allelic ratio.

<h3>What is evolution?</h3>

Evolution refers to the changes that occurs in organisms over a long period of time such that those changes results in new species better adapted to their environment and having higher specialization.

One of the factors of evolution is mutation.

According to the Hardy-Weinberg principle, the allele and genotype frequencies of a population of organism in equilibrium will remain constant in the absence of evolutionary influences.

Therefore, if a mutation occurs in the population, the allelic ratio will change.

Learn more about Hardy-Weinberg principle at: brainly.com/question/1365714

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An individual with (naturally) curly hair and an individual with (naturally) straight hair mate; all of their offspring have (na
polet [3.4K]

Answer:

Incomplete dominance

Explanation:

The traits in the organisms are controlled by the genes which are present in the form of two alleles on the chromosomes. Each allele represents the variant of the trait which is determined when these alleles unite during sexual reproduction.

The allele can be dominant when it shows its effect or it can be recessive when it is suppressed during fusion.

In the given question, the studied trait is the pattern of the hair which is present in two variants: the curly hair and the straight hair. When the parents for these traits were crossed they produced offspring which was intermediate between the curly and the white hair. This intermediate trait shows that neither of the two alleles which control the trait is dominant and the trait blended. This natural process is known as incomplete dominance.

Thus, Incomplete dominance is correct.

4 0
3 years ago
How are molecules of sucrose held together to form a grain of sugar?
Len [333]
Disaccharides form when two monosaccharides undergo a dehydration reaction (a condensation reaction); they are held together by a covalent bond. Sucrose (table sugar) is the most common disaccharide, which is composed of the monomers glucose and fructose.
7 0
3 years ago
Identify a signal the brain sends out after the nervous system sends the signal that pH has dropped.
spin [16.1K]

In response to a notification of a <u>decrease</u> in blood pH by the nervous system, the brain sends signals to the external intercostal muscles and the diaphragm.

<h3>What is blood pH?</h3>

Blood pH can be defined as a measure of the molar concentration of hydrogen ions that are present in the blood of a living organism, with respect to its acidity, neutrality or alkanlity (basicity).

In response to a notification of a <u>decrease</u> in blood pH by the nervous system, the brain would send signals (impulses) to the external intercostal muscles and the diaphragm through its respiratory center, so as to help the living organism increase its breathing rate and the volume of its lungs during inhalation.

Read more on blood pH here: brainly.com/question/11209525

6 0
2 years ago
Please help ASAP<br> Will give brainliest
Bezzdna [24]
<h3>B. contraction of muscles.</h3>

3 0
3 years ago
Help me please will give brainliest ​
scoundrel [369]

Answer:

The answer is double helix.

Explanation:

In its natural state, each DNA molecule is actually composed of two single strands held together along their length with hydrogen bonds between the bases. Watson and Crick proposed that the DNA is made up of two strands that are twisted around each other to form a right-handed helix, called a double helix.

Hope this helps!! ;)

8 0
3 years ago
Read 2 more answers
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