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choli [55]
2 years ago
6

When sperm and egg cells undergo meiosis, the number of chromosomes goes from ______ to _______. When an egg is fertilized by a

sperm cell that number goes from ______ to ______.
Biology
1 answer:
Lana71 [14]2 years ago
5 0

Answer:

2n to n, n to 2n

Explanation:

Meiosis is known as reductional division because in meiosis the chromosome number gets reduced to half in daughter cells so when sperm and egg cells undergo meiosis than the chromosome numbers get reduced from 2n to n. In humans, the chromosome number is 46 and it gets reduced to 23 after meiosis.  

When egg is fertilized by the sperm than the two chromosomes comes in the same cell and the number goes from n to 2n that mean in human it goes from 23 to 46.

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Match each component of biodiversity to the example of how it contributes to ecosystem stability.
professor190 [17]

Answer:  

Genetic diversity: Some individuals in a population of wild rabbits are resistant to a new disease.

Ecosystem diversity: If the population of wild rabbits decreases, a bobcat can switch its diet to squirrels or woodchucks.  

Species diversity:  Populations of wild rabbits from a forest and from a neighboring meadow can interbreed, which increases variation.  

Biodiversity of an ecosystem is usually explored by three diversities which are responsible for ecosystem stability they are : genetic diversity, ecosystem diversity and species diversity.

Genetic diversity is the variety of genes within a population of species. Each species consists of individuals bearing different genetic composition. Some individuals in a population of wild rabbits are resistant to a new disease because they exhibit genetic diversity within the population as a consequence some individuals exhibit genes which protect them against new disease.

Species diversity is the variety of species within an ecosystem. Populations of wild rabbits from a forest and from a neighboring meadow can interbreed, which increases variation is an example of species diversity. The wild rabbits from a forest and a neighboring meadow are two species living in an ecosystem stating the diversity of species in an ecosystem.

Ecosystem diversity is the variety of ecosystems in a given region.If the population of wild rabbits decreases, a bobcat can switch its diet to squirrels or woodchucks is an example of ecosystem diversity because in an ecosystem there is interaction of organisms as predator prey relationship. This example is also relating with predator prey relationships in an ecosystem.


8 0
2 years ago
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Use the drop-down menus below to match the scientist(s) to their contribution to the discovery of base pairings. studied the rol
victus00 [196]

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2 years ago
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You complete an experiment measuring the spread of the Cordyceps fungus across a forest environment. You measure the amount of g
anygoal [31]

This seems to be the best answer: C. The data does not take into account underground growth and the actual area of fungus spread may be larger, so the original conclusion of the experiment is not accurate.

8 0
2 years ago
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The Sun has six regions or layers. Identify the Sun's layers, beginning with the innermost and moving out. 1. Innermost core 2.
ycow [4]

Answer: Beginning from the inside and moving towards outside the sun has six layers. Sun is the ultimate source of energy for all the living organisms on earth. The heat and light that comes out of the sun is through the various layers that is present in the sun.

1. Innermost core: It is the region from where the sun gets all the energy. Here hydrogen and helium is present. Due to high pressure of the surrounding layers hydrogen fuses into helium releasing high energy photons.

2. Radiative zone: The high energy photons are now transferred from core to radiative zone. Here the high energy photons are constantly absorbed and re-emitted. It takes millions and billions of years for these high energy particles to come out of this radiative zone.

3. Convective zone: The temperature of this region is quite cooler as compared to that of core and radiative zone. The plasma present in this region makes the magnetic field of the sun.

4. Photosphere: It is the region where sunspots are found. These are called by the magnetic field of sun.

5. Chromosphere: This region is red in color. It contains filaments of gas that rise up from the surface of the sun. This region is cooler than photosphere.

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7 0
2 years ago
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Which situations would be most likely to engage the anterior cingulate cortex?
maria [59]

Answer:

Which of the following situations would be most likely to engage the anterior cingulate cortex?

A waiter walks over to your table at a restaurant and holds an open menu in front of you.

You walk into the elevator of your apartment building and press the button for your floor.

You enter your classroom and find someone sitting in your usual seat.

A good friend asks you to remind him of your telephone number.

Explanation:

In order to meet the demand of the surrounding environment   by adjusting  the  motor outputs from the brain to the environments ,a part of the emotion control part of the brain( limbic system) called the anterior cingulate cortex is responsible for this.

Anatomically, the limbic system is made up of the primarily the amygdala, hippocampus, thalamus, hypothalamus, basal ganglia and cingulate gyrus.

Based on the this its(anterior cingulate cortex) functions are formation of emotion in the limbic system, and  possessing  of memory and learning.

it is also a major  parts of  of pain networks for pain modulation and perception.

Therefore whenever there is  change in the environment  from the prestored condition in the brain,(e.g the usual seat  in the class room  occupied above) the anterior cingulate cortex adjust the motor input from the brain to adapt to the new environment to take an action,whih in this case  leads to the reclaiming of the seat or any other necessary proactive action.

4 0
2 years ago
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