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3 years ago

alaska is faumous for going day at a time without sunlight. predict when this would occur. why does it happen?

Biology

1 answer:

Marysya12 [62]3 years ago

5 0

Answer:

Alaska can have days with unusually long nights, this is due to its position on Earth. Earth has two poles, North and South; Alaska is very close to the North Pole. This affects the way the sun reaches Alaska. We know that since the Earth is tilted on an axis during the North's winter the pole is pointed away from the sun. Since Alaska is close to the pole it is also pointed away from the sun during the winter. This is why during the season Alaska has very short days.

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The __________ is the fatty substance that insulates and protects the axon. A. Cell body B. Axon terminal C. Neural receptor D.

inysia [295]

The fatty substance that insulates and protects the axon is myelin sheath. That is option D.

<h3>The nerve cells (neuron)</h3>

The nervous system is made up of nerve cells that helps to send and receive signals that are interpreted by the brain.

The parts of the nerve cell include the following:

the dendrites,

the cell body,

the axon and

the axon terminal.

The axon is part of the nerve cell that transmits electrical signals. it is surrounded by myelin sheath.

The myelin sheath is a fatty layer that insulates the axon and helps it transmit signals over long distances.

Therefore, the fatty substance that insulates and protects the axon is myelin sheath.

Learn more about neurons here:

brainly.com/question/13061744

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2 years ago

A geneticist crossed fruit flies to determine the phenotypic ratio. The geneticist crossed a fly with blistery wings and spinele

kondor19780726 [428]

Complete question:

A geneticist crossed fruit flies to determine the phenotypic ratio. The geneticist crossed a fly with blistery wings and spineless bristles (bbss) with a heterozygous fly that had normal wings and normal bristles (BbSs). Which proportion of offspring that are dominant for both traits in would you not expect based on Mendel's law of independent assortment? 1/2 , 4/16, 25% , or 1/4

Answer:

1/2 is the proportion of the offspring that is NOT expected among individuals that are dominant for both traits.

4/16 = 1/4 = 25% of the progeny and the correct expected proportion of individuals that are dominant for both traits.

Explanation:

<u>Available data</u>:

Cross: a fly with blistery wings and spineless bristles with a heterozygous fly that had normal wings and normal bristles
Recessive trait: blistery wings and spineless bristles
Dominant trait: normal wings and normal bristles

Let us say that:

B is the dominant allele for normal wings
b is the recessive allele for blistery wings
S is the dominant allele for normal bristles
s is the recessive allele for spineless bristles

Parentals) bbss x BbSs

Gametes) bs, bs, bs, bs BS, Bs, bS, bs

Punnett square) BS Bs bS bs

bs BbSs Bbss bbSs bbss

F1) 4/16 = 1/4 = 25% of the progeny is expected to be BbSs, dyhibrid individuals, expressing normal wings and normal bristles

4/16 = 1/4 = 25% of the progeny is expected to be Bbss, expressing normal wings and spineless bristles

4/16 = 1/4 = 25% of the progeny is expected to be bbSs, expressing blistery wings and normal bristles

4/16 = 1/4 = 25% of the progeny is expected to be bbss, expressing blistery wings and spineless bristles

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3 years ago

During which phase of the cell cycle does the cell prepare for mitosis?

Natasha2012 [34]

Answer:

The second growth phase

Explanation:

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Which best describes the scientists who contributed to our current body of

sweet-ann [11.9K]

Answer:D

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harina [27]

Consumption of food
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3 years ago

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