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MArishka [77]
4 years ago
10

PLEASE HELPPP! THANK YOU!

Biology
1 answer:
stepan [7]4 years ago
3 0

Answer:

The circulatory and respiratory systems absorb oxygen from the air and transfer it to all parts of the body while absorbing carbon dioxide from the body and releasing it into the air. When a person inhales, the lungs expand and fill with fresh air.

Explanation:

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Crossing over prevents homologous chromosomes from separating during meiosis i. true or false?
Scilla [17]

Crossing over does not prevent homologous chromosomes from separating during meiosis, hence, the statement is false.

CROSSING OVER:

  • Crossing over is the process whereby non-sister chromatids of homologous chromosomes exchange their genetic materials.

  • Crossing over occurs specifically during the prophase I stage of meiosis I. Via this process, genetic diversity is likely to occur in the daughter cells.

  • Crossing over only assures that genes of homologous chromosomes are recombined, it does not stop them from separating in the Anaphase stage.

  • Therefore, crossing over does not prevent homologous chromosomes from separating during meiosis, hence, the statement is false.

Learn more at: brainly.com/question/18824252?referrer=searchResults

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Differentiate between uniform and nonuniform motion​
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Answer:

  1. Uniform motion is the motion in which body covers equal distances in equal intervals of time
  2. nonuniform motion is the motion in which body covers unequal distances in equal intervals of time
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2 years ago
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During which phase of meiosis does each of the following events occur?
lubasha [3.4K]

Answer:

(a) crossing over: Meiosis I, Recombination  

(b) chromatids separate at their centromeres and migrate to opposite poles: Meiosis II, Anaphase II

(c) chromosomes become aligned in pairs at the equator: Meiosis II, Metaphase II

Explanation:

Homologous recombination is a type of genetic recombination that occurs during meiosis (formation of ovum and sperm cells). The paired chromosomes of the male and female parents are aligned so that similar DNA sequences intersect. This crossing over produces an exchange of genetic material, which is an important cause of the genetic variability observed in the offspring.

Meiosis II: Anaphase II. The centromeres separate and the daughter chromatids - now individual chromosomes - move to the opposite poles of the cell. The centromeres separate, and the two chromatids of each chromosome move toward the opposite poles in the spindle.

Meiosis II: Metaphase II. Chromosomes are accommodated in the equatorial plate of metaphase, similar to what happens in mitosis. They are attached to the already fully formed meiotic spindle. Each chromosome is aligned in the equatorial plate of the metaphase, as it happens in mitosis.

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