Does mutation decrease or increase genetic variation

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Answer 1

Answer:

Answer:

Mutations are changes to an organism's DNA and are an important driver of diversity in populations. Species evolve because of the accumulation of mutations that occur over time. ... This mutation has introduce a new allele into the population that increases genetic variation and may be passed on to the next generation

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Why are bacteria such as Rhizobium and cyanobacteria so important in thenitrogen cycle?
A. They return nitrogen gas to air
B. They fix atmospheric nitrogen gas for the food chain
C. They decompose dead plants and animals
D. They build protein in plants

Answers

Answer:A. They return nitrogen gas to air

Explanation:

Answer:

The correct answer is B

Explanation:

Got it correct on GAVS..

What is the layer of myelin that surrounds an axon called?Group of answer choices

1. Node of Ranvier
2. Perichondrium
3. Perimysium
4. Myelin sheath
5. Periosteum

Answers

The gaps (approximately 1 micrometer wide) formed between myelin sheath cells long the axons are called Nodes of Ranvier. Since fat serves as a good insulator, the myelin sheaths speed the rate of transmission of an electrical impulse along the axon.

I think the answer is Nodes of Ranvier but I’m not sure. I hope this helped <3

In some states, the highway patrol uses planes carrying radar devices to monitor traffic. As the plane flies over traffic, the radar device can tell the officers how fast each car is moving at that moment in time. The radar device determines the car's

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Answer: Radar is a highly upgraded electromagnetic device or technology that helps in determining where an object is located, at what distance it is, and also determines the speed and direction at which an object is moving, and at what angle it is.

It is generally used by the traffic police, for controlling the speed limit of a vehicle or motorbikes in any countries.

It determines the car's velocity, commonly known as speed.

Seeds of plants are the best example of which living characteristic

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Answer:

adaptation through evolution and ability to reproduce

If a DNA molecule was a spiral staircase, what would the steps of the staircase be?

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Answer:

Nitrogenous bases

Explanation:

DNA is a nucleic acid molecule that acts as the genetic material of the organisms. The structure of DNA is made of two strands of nucleotides that are linked together and form a helical structure. The helical structure is known as the double-helical model with a ladder-like appearance.

The backbone of the ladder is composed of the sugar and phosphate groups at alternate positions whereas the staircase of the ladder are made of the different type of nitrogenous bases (A, G, T, C) joined by the hydrogen bond.

Thus, Nitrogenous bases is the correct answer.

Pink eye is a recessive trait found in deer mice. In a cross between two individuals, both of whom are heterozygous for the pink eye mutation, the following offspring are obtained:Normal 18

Pink eye 2

Use the chi-square test to determine if the observed numbers of offspring fit the expected numbers of offspring from this cross. The value of is: ____________

Answers

Answer:

See the answer below

Explanation:

If pink eye is recessive, it means that the normal eye is the dominant trait. According to Mendelian law, the ratio of normal to pink eye in a cross involving two heterozygous mice should be 3:1.

Chi-square = $((O - E)^2)/(E)$ where O = observed frequency and E = expected frequency.

Phenotype Observed Expected Chi-square

Normal 18 3/4 x 20 = 15 $((18 - 15)^2)/(15)$ = 0.6

Pink 2 1/4 x 20 = 5 $((2 - 5)^2)/(5)$ = 1.8

Total Chi-square = 0.6 + 1.8 = 2.4

Degree of freedom = 2 - 1 = 1

Critical Chi-square value at 95% = 3.841

The critical Chi-square value is more than the calculated value. Hence, the observed number of offspring fits the expected number of offspring.

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