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eimsori [14]
3 years ago
10

Most new alleles probably arise from ____. a. Rearrangement of existing alleles into new combinations b. Independent assortment

of nonhomologous chromosomes c. Large-scale changes in chromosome structure d. Small-scale mutations in dna e. Crossing over between homologous chromosomes
Biology
1 answer:
Drupady [299]3 years ago
6 0

Answer;

- large-scale changes in chromosome structure

Explanation;

-Alterations to chromosome structure or changes in the number of copies of chromosomes in a cell.

-Allele frequencies in a population may change due to four fundamental forces of evolution: Natural Selection, Genetic Drift, Mutations and Gene Flow. Mutations are the ultimate source of new alleles in a gene pool. Mutation is important as the first step of evolution because it creates a new DNA sequence for a particular gene, creating a new allele.

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You want to determine whether short wings in fruit flies are the result of a dominant or recessive mutation. You cross a short-w
Natalka [10]

Answer:

a dominant mutation

Explanation:

A monohybrid testcross is a cross-breeding experiment used to determine if an individual exhibiting a dominant phenotype is homo-zygous dominant or heterozygous for a particular phenotypic trait (in this case, wing length). In a monohybrid testcross, a 1:1 phenotypic ratio shows that the dominant parental phenotype was a heterozygote for a single gene that has complete dominance. Moreover, a 3:1 ratio in the F2 is expected of a cross between heterozygous F1 individuals, which means that 75% of individuals with short wings have the dominant allele that masks the expression of the long-wing trait (i.e. the recessive allele).

4 0
3 years ago
Why did a well-known pharmacologist refer to the recreational use of cocaine, crack cocaine, amphetamine, and methamphetamine as
Dimas [21]

Answer:

The answers are c)are the most reinforcing, generate the greatest immediate sensual appeal, and produce the most powerful psychological dependence.

Explanation:

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Among the medical complications related to the use of these substances, acute neurological complications, seizures and cerebrovascular diseases stand out.

7 0
3 years ago
1
Jet001 [13]

Answer:

6 10

Explanation:

i think it is the answer

4 0
3 years ago
The way you breathe and the way your heart beat changes when you run fast.
CaHeK987 [17]

Answer:

Your body sends a message to the lungs and tell the lungs to breathe in more oxygen so that the oxygenated blood can travel to the muscles oxygenating the cells within that specific muscle and giving them energy to use the sugars stored in fat or food from digestion. The heart beats faster so that the cells supply keeps up and continues to beat fast for that specific diration of time until your breathing slows down and it no longer needs to work as fast to supply the muscles with as much blood.

7 0
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Find the total number of<br> atoms in each molecule.<br> Na3PO4
Lunna [17]

Answer:

8

Explanation:

There are 3 sodium atoms, 1 phosphorus atom, & 4 oxygen atoms.

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6 0
3 years ago
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