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2 years ago

Why a single ovum is produced by oogenesis

Biology

1 answer:

Tasya [4]2 years ago

7 0

Answer: The other ova become polar bodies.

Explanation: After meiosis I and II in oogenesis, there should be 4 eggs, but there aren't because the other eggs 3 eggs become these small cells called polar bodies that end up dying out through apoptosis. The reason why polar bodies are made is because they take out extra DNA that the single ovum is supposed to have.

So only 1 egg is made and the rest are polar bodies that get rid of extra DNA and then die by apoptosis.

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The first sphincter encountered in the alimentary canal is the: The first sphincter encountered in the alimentary canal is the:

Arte-miy333 [17]

Answer:

The correct answer is: upper esophageal sphincter.

Explanation:

The alimentary canal is a very long tract responsible for the digestion of the food. It is composed of several organs with many different and important functions. The alimentary canal also has a few sphincters, which are muscular valves that open and close when needed for the food to pass or be retained.

The first sphincter is the upper esophageal sphincter. One particularity of this sphincter is that is one of the few sphincters in the body that opens and closes under our conscious control, which happens when we decide to swallow our food.

From the first to the last, the order of the sphincters in the gastrointestinal tract is: upper esophageal sphincter, lower esophageal sphincter or gastroesophageal sphincter, pyloric sphincter, ileocecal sphincter, and anus.

4 0

2 years ago

Why do young plants taste sweeter than older plants?

sashaice [31]

Because they are ripe they havent gotten their natural flavor

3 0

2 years ago

In a flowering plant, tall (T) is dominant to short (t), and blue flowers (B) is dominant to white flowers (b). A tall plant wit

Bumek [7]

<h3>Answer: </h3><h3 />

25%

<h3>Explanation:</h3>

Following a cross between <u>Ttbb</u> and <u>ttBb</u>, the resulting offspring would be:

TtbB , TtbB , Ttbb , Ttbb , ttbB , ttbB , ttbb , ttbb , TtbB , TtbB , Ttbb , Ttbb , ttbB , ttbB , ttbb , ttbb

To have a clearer idea, see the attached image.

Of the 16 possible combinations from this dihybrid cross, there will be:

4 tall plants with blue flowers

4 tall plants with white flowers

4 short plants with blue flowers

4 short plants with white flowers

There are 4 possible genotypic recombinations that would yield short plants with white flowers out of a possible 16, so the chance that the offspring will be short with white flowers would be 4/16 which is 1/4 or 25%

<h3>Hope this helps</h3>

6 0

2 years ago

Explain how the muscles pectoralis major and serratus anterior show two different ways in which muscles are named.

expeople1 [14]

Muscles pectoralis, an enormous muscle that ventilates beginning from shoulder to breastbone. The serratus foremost is named for its connection deep down and its source and muscle filaments. The pectoralis major is named for its size and area in the body.

3 0

2 years ago

A cyclin called cyclin E forms a complex with a cyclin-dependent kinase called Cdk 2. This complex is important for the progress

Thepotemich [5.8K]

Answer:

B. The amount of unbound cyclin E is lowest as the cell enters S.

Explanation:

The reproduction of the cell is a cycle that it regulates by itself, depending the demand of a certain cell.

In the case of the mitosis, in Each change from G1 to S to G2 to M is regulated by some proteins like the cyclin.

In the case of the cdK2 is ncessary to pass the control point to pass from the stage G1 to the stage S.

Another characteristic of the cyclins, is that these proteins are synthetized and degraded constantly during the hole process.

Hope this is a useful info

8 0

2 years ago