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In humans, the allele for brown eyes, B, is dominant over the allele for blue eyes, b. Which combination of alleles shown below

Norma-Jean [14]

Answer:

bb

Explanation:

the only way the recessive trait shows is if the dominant allele isn't present at all otherwise the dominant allele will show

7 0

3 years ago

Explain the differences between the thalamus, hypothalamus, and epithalamus?

stiv31 [10]

Answer:

The epithalamus, perithalamus, thalamus and hypothalamus have in common that they are all part of the brain region known as the diencephalon. This structure is extremely important as it will be responsible for the collection, interpretation, and relying of information from the midbrain and other systems towards the cerebral cortex, and other parts of the brain, and then will be responsible also for collecting the responses from the higher brain regions towards the appropriate places.

However, each of these structures is different and has a different purpose.

The eipthalamus, which would be the outermost structure of the diencephalon, is the first region where information is relayed by the midbrain and the lymbic system. This structure is responsible also for the secretion of melatoning, which controls the circadian rythm, present in its most important portion, the pineal gland. It also controls the secretion of certain hormones of the pituitary gland, but it is not its biggest role.

Then comes the thalamus. This structure is also really important as it is also a centre of collection of information, especially that relayed by the midbrain, towards the cortex. Without the thalamus, there would be no connection between the cerebral cortex, the midbrain, and other parts of the body. Another major role of the thalamus is to regulate all regarding the process of sleep, wakefulness and alertness in the body

Finally, we have the hypothalamus, and its importance its enormous. This small portion of the diencephalon is responsible for the whole process of homeostasis, which means, it regulates all the processes that will bring equilibrium to the body. It also works as a bridge between the nervous and endocrine systems, as the hypothalamus controls the secretion of hormonal messengers from the pituitary gland towards other glands.

These are only a few of the differences between these portions of the diencephalon, without mentioning the anatomical and physiological differences between them.

8 0

4 years ago

Barbara is planning to participate in the Boulder marathon next year. Since last month, she has been following a healthy diet an

svet-max [94.6K]

Answer:

45

Explanation:

it is

3 0

3 years ago

Which activity involves a chemical change?

Rama09 [41]

option C is correct........

.. Please follow me and mark as brainliest

7 0

3 years ago

1. How many food chains make up the food web?

viva [34]

Answer:

A food web can be formed by more than one food chain, since the webs includes all possible interactions that can occur between individuals of different trophic levels.

Explanation:

Based on the scheme shown in the image

<h3>1. How many food chains make up the food web? </h3>

This food network is made up of three food chains

<em>Plant → Bird → Snake</em>
<em>Plant → Insect → Bird → Snake</em>
<em>Plant → insect → Frog → Snake</em>

Food webs often include several food chains, since they are due to the interaction between organisms at different trophic levels, which actually happens within an ecosystem.

<h3> 2. Which organism is an herbivore? </h3>

In this case, both the insect and the bird are herbivorous organisms, since they feed of the producer, which is the plant.

<h3> 3. Which organism is an autotroph? </h3>

The only autotrophic organism is the plant, since it is capable of manufacturing its nutrients from sunlight and inorganic matter.

<h3> 4. Which organism is a third-order heterotroph? To what trophic level does that organism belong? </h3>

The third order heterotroph is the snake, since it feeds on other animals. The snake is a carnivore and can be a secondary or more commonly tertiary consumer, so it can be placed in the 3rd or 4th trophic level.

<h3> 5. Which organism is an omnivore? </h3>

According to the scheme proposed, the bird is omnivorous, since it feeds on both plants and insects.

<h3> 6. Which organisms belong to more than one food chain? </h3>

In this case, the plant, the insect, the bird and the snake are part of more than one food chain.

<u><em>Plant → Bird → Snake</em></u>
<u><em>Plant → Insect → Bird → Snake</em></u>
<u><em>Plant → insect</em></u><em> → Frog → </em><u><em>Snake</em></u>

<h3> 7. Which organism belongs to more than one trophic level? </h3>

The bird can be located in both the second and third trophic level, being a primary consumer —when it feeds on plants— or secondary, when it feeds on insects.

<h3> 8. What are decomposers? From which trophic levels are the organisms that decomposers feed on? </h3>

Decomposers are generally bacteria and fungi, organisms capable of degrading organic matter, thus enriching the soil. Decomposers can feed on any trophic level.

<h3> 9. What does a pyramid of energy show about the amount of energy available at different trophic levels of a food chain? </h3>

As the ascent of the pyramid occurs —or at the upper trophic level— the amount of energy available decreases. This is because from one trophic level to another only 10% of the energy can be used. If a plant has 5000 Kcal available, the herbivore that consumes it can only use 500 Kcal.

<h3> 10. Why do different trophic levels have different amounts of energy?</h3>

The main <u>reason for the difference in energy in each trophic level is that energy is lost in each one of them</u>, which the organisms use in their metabolism. A consequence of the metabolism is the loss of energy as heat, which is acquired by the environment.

8 0

4 years ago