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sergeinik [125]
3 years ago
7

Which processes lead to most genetic variation in sexually reproducing organisms? select all that apply. select all that apply.

crossing over independent orientation of chromosomes in meiosis random fertilization cytokinesis submitprevious answersrequest answer?
Biology
2 answers:
Mama L [17]3 years ago
8 0
The processes that lead to most genetic variation in sexually reproducing organisms are as follows;
- cross over
- independent orientation of chromosomes in meiosis
- random fertilization
The behavior of chromosomes during fertilization and meiosis is what brings most of the variation that arises each generation during sexual reproduction.
Triss [41]3 years ago
3 0

Answer:

The correct answer is crossing over.

Explanation:

Genetic variation in organisms is the basis of diversity of organisms on this planet.

This genetic variation in organisms happens during the time of gamete formation in meiosis where the exchange of chromosome takes place in pachytene stage of prophase I. This exchange of segment is called recombination which produces a unique combination of the allele.

Thus, crossing over is the correct option.

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2 years ago
Animals with a three-chambered heart would include:_______
Setler79 [48]

Animals with a three-chambered heart would include Amphibians.

  • Amphibians have three-chambered which comprises of two Atria and one ventricle. Examples of Amphibians include Frog, Toads, Salamanders.
  • In Amphibians heart blood from the single ventricle travels to the lungs, skin, and body, where it is oxygenated. Before being pumped out of the heart, deoxygenated and oxygenated blood are mixed in the ventricle.
  • This is because the Amphibians have low rate of metabolism and thus requires less oxygen for their metabolism.
  • As a result heart's load to deliver oxygenated blood to body is lowered.

Thus, from the above pointers we can conclude that only Amphibians from the option have three-chambered heart.

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4 0
1 year ago
The presence of a controlled substance must be proven in both the blood and the ____ before it can be considered as a cause of d
sergey [27]

The presence of a controlled substance must be proven in both the blood and the organs before it can be considered as a cause of death.

A controlled substance is the one that is prohibited or available under strict regulations by the law of a country or state. These are usually the drugs that can result in addiction or serious diseases in an individual. Such substances are only available for medicinal purposes.

Blood is a red colored fluid present inside the body. It is red due to the presence of a pigment called hemoglobin. The blood is responsible for the transport of substances across the whole body, like oxygen, hormones, carbon dioxide, waste material, etc.

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5 0
1 year ago
Neither whales nor pythons have hind legs, but both have internal remnants of legs and hip bones. Snakes and whales must have I.
alexandr402 [8]

Answer:

I. evolved from ancestors that walked

Explanation:

Whales and pythons have vestigial structures, which are structures (hind legs) which are no longer useful to them since they have evolved. The ancestors of the whale and python did use the hind legs but over generations the whale and snake have adapted to new environments and they no longer need them.

4 0
3 years ago
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