BIOLOGY MIDDLE SCHOOL

What is the role of DNA in determining an organisms traits?

Answers

Answer 1
Answer: Everything. DNA contains genes In which in a person determines proteins how much protein is formed is based on how strong the trait is. DNA also determines every genetic trait an organism has.DNA's main role is to store information.

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Select the correct answer.The largest coral reef in the Western Hemisphere is located off which country's coast?A. BelizeB. MexicoC. Trinidad and TobagoD. Cuba
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In your garden, you are growing several plants of the species Florus imaginarium. You have observed that some of the individuals have leaves with rounded tips and others have leaves with pointed tips. One of these traits is dominant and the other is recessive. Assuming all the plants in your garden are true-breeding, how would you go about determining which trait is dominant and recessive?
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Which of the following is not an organelle found ONLY in plant cells?

Answers

-Chloroplasts: Chloroplasts are the plant cell's "energy power plant" as well as mitochondria- they are involved in photosynthesis, making food and energy for the cell.

-Cell walls: Cell walls are rigid layers around the cell membrane. They are made of cellulose and help maintain the cell's shape and prevent it from swelling too much.

One organelle only in animal cells:

-Centrioles: Centrioles are structures that make spindle fibers for the movement of chromosomes in mitosis.

A different organelle:

-Vacuoles:

In plant cells, the vacuole is called a "central vacuole". The central vacuole is a large "balloon" that holds water, nutrients, ions, trash, etc. for the cell.

In animal cells, there are numerous smaller vacuoles. They have the same function.
The cell wall is only located in the plant cell

What are the two types of behavioral adaptation

Answers

Answer:

The 2 types of behavioral adaptation are migration, and hibernation.

Explanation:

Adaptation of animal is the fitness towards its environment. If an animal can't adapt, it will perish with time. Adaptation may be genetic or acquired. But basically, adaptation is 2 types - physical adaptation, and behavioral adaptation.  

Physical adaptation includes the coloring of the body, camouflage activity of an organism. The behavioral adaptation is the respond of the organisms to their habitat. This includes hibernation, estivation, migration, etc.

Some animals are affected by the temperature difference of the environment. Therefore, they adopt some methods to survive in extreme temperatures.

The cold-blooded like amphibians hibernate during winter.  They undergo a long sleep during cold weather and become active in summer.  Similarly some animals like desert lizard active in the morning. When the temperature increase they burrow themselves under the ground. This is called estivation.

Birds migrate during the adverse season i.e. in winter. They temporarily go to a different place to spend the cold month and return during the advent of summer. This is one type of behavioral adaptation. They also migrate for better breeding ground and food.  

Some fishes also migrate for breeding and food.

All organisms have adaptations that help them survive and thrive. Some adaptations are structural. Structural adaptations are physical features of an organism like the bill on a bird or the fur on a bear. Other adaptations are behavioral. Behavioral adaptations are the things organisms do to survive. For example, bird calls and migration are behavioral adaptations.
Adaptations are the result of evolution. Evolution is a change in a species over long periods of time.
Adaptations usually occur because a gene mutates or changes by accident! Some mutations can help an animal or plant survive better than others in the species without the mutation.
For example, imagine a bird species. One day a bird is born with a beak that is longer than the beak of other birds in the species. The longer beak helps the bird catch more food. Because the bird can catch more food, it is healthier than the other birds, lives longer and breeds more. The bird passes the gene for a longer beak on to its offspring. They also live longer and have more offspring and the gene continues to be inherited generation after generation.
Eventually the longer beak can be found in all of the species. This doesn't happen overnight. It takes thousands of years for a mutation to be found in an entire species.
Over time, animals that are better adapted to their environment survive and breed. Animals that are not well adapted to an environment may not survive.
The characteristics that help a species survive in an environment are passed on to future generations. Those characteristics that don't help the species survive slowly disappear.

How does a shield volcano form?

Answers

A shield volcano are formed by lava flows of low viscosity


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Two heterozygous red flowers (white flowers are recessive) are crossed

Answers

As per the details given, the offspring from this cross are expected to have a 1:2:1 ratio of homozygousred, heterozygous red, and homozygous white flowers, respectively.

The expected result of crossing two heterozygous red flowers (where the white flower trait is recessive) is as follows:

  • There is a 25% chance that homozygous red flowers (RR) will display the dominant red characteristic.
  • 50% chance of obtaining heterozygous red flowers (Rr), which carry the recessive white allele but nevertheless display the dominant red characteristic.
  • Having homozygous white flowers (rr) with the recessive white trait is a 25% likelihood.

Thus, there should be a 1:2:1 ratio of homozygous red, heterozygous red, and homozygous white flowers in the progeny of this cross.

For more details regarding homozygous and heterozygous, visit:

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Your question seems incomplete, the probable complete question is:

Two heterozygous red flowers (white flowers are recessive) are crossed. What is the expected outcome when two heterozygous red flowers (where the white flower trait is recessive) are crossed?

Answer:

3;1

Explanation:

Why a circulatory system is important in meeting the needs of all cells throughout an animal's body?

Answers

The circulatory system is vital in the exchange of oxygen with the cells in the animal's body because there is no living creature that can survive without oxygen, it keeps the body active.

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On a speed-time graph, the __ measures acceleration.

Answers

The correct answer is speed time graph in the blank space
This does not mean exelaration this means stop as it is a straight line hope this heleped
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