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bezimeni [28]
2 years ago
10

PLZ HELP 46 POINTS WHOEVER ANSWERS GETS BRAINEST !!! What happens before mitosis occurs?

Biology
1 answer:
ser-zykov [4K]2 years ago
5 0

Answer:

<h2>A. <em>The cell grows and makes a copy of its genetic material</em></h2>

Explanation:

Before Mitosis, is a stage in the cell cycle called the 'Interphase'. During Interphase, the cell grows and makes a copy of its genetic material. During the G1 phase, the cell grows. During S phase, the cell's DNA replicates itself. And during G2, the cell grows and prepares for cell division (mitosis)

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An atom ability to undergo chemical reactions is determined by its
vlabodo [156]

The atoms and molecules produced by the reaction are called products. This causes the atoms to be rearranged into new substances.

The answer:

An atom's ability to undergo chemical reactions is determined by its outermost electrons.

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3 years ago
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Read each of the sentences that describe a phase of meiosis. Place each sentence into the correct box.
Allushta [10]

Answer:

prophase 1(Homologous chromosomes pair to form a tetrad.

prophase 1(Crossing-over may occur between the non-sister chromatids).

Metaphase 1 (Homologous chromosomes line up at the center of the cell.)

Anaphase 1 (Homologous pairs separate and move towards opposite ends of the cell)

Telophase 1 (A nuclear membrane forms and cytokinesis follows).

Metaphase 2 ( The haploid number of duplicated chromosomes line up at the metaphase plate.

Anaphase 2 (Sister chromatids separate and become daughter chromosomes that move to the poles)

Meiosis 2: Four haploid daughter cells are formed that are not genetically identical.

Explanation:

Meiosis is a type of cell division that gives rise to gametes ( offsprings). This type of cell division occurs only in the reproductive organs. A diploid cell has two sets of chromosomes: one from the female parent and the other one from the male parent. When the diploid cell undergoes meiosis, the chromosome replicate once and the nucleus and cell duplicate twice giving rise to four haploid gamete cells.

The phases of meiosis occurs in two step divisions. Homologous pairs separate during the first round cell division which occurs in MEIOSIS 1 while the sister chromatids separate in the second nuclear division called MEIOSIS 2.

In each round of division, cells go through four stages: PROPHASE, METAPHASE, ANAPHASE, and TELOPHASE. The specific events that occur in these stages are already listed in the above answer.

Generally, at the start of meiosis, each member of a homologous pair of chromosomes, which are made up of two chromatids, moves to lie side by side. While they are thus paired, genetic material is exchanged between the chromatids. This is known as CROSSING OVER.

When the nucleus divides for the first time, the chromosomes in a given pair( not the chromatids) separate and move to opposite ends of the cell. This results in only half the number of chromosomes going to each daughter cell.

During the second nuclear division, the chromatids separate and move to opposite ends of each daughter cell giving rise to four gamete cells, each with a haploid number of chromosomes.

7 0
3 years ago
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Developmental psychologists study physical, cognitive, and ________ changes throughout the human life span.
statuscvo [17]

Answer:social,intellectual,perceptual,personality and emotional growth.

Explanation:

The study of development psychology is important in understanding how humans mature.The role of a development psychologist is to study the changes in human development across the life span.This changes include:

•physical

•cognitive

•social

•intellectual

•perceptual

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3 years ago
Carbon and fluorine combine covalently to form a binary compound. What is the formula of the compound with the name carbon tetra
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Carbon and fluorine combine covalently to form a binary compound. the formula of the compound with the name carbon tetrafluoride is CF4.

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When would a male be expected to improve his fitness by attempting to mate at sea rather than establishing a harem?.
Colt1911 [192]

D. A small male will do better mating at sea when suitable beaches are more common than are large, dominant males.

When small males are relatively abundant then would a male be expected to improve his fitness by attempting to mate at sea rather than establishing a harem.

The ability of an organism to reach reproductive age, find a mate, and give birth is referred to as biological fitness, sometimes known as Darwinian fitness. In essence, the number of offspring an organism has over the course of its lifespan determines its biological fitness.

Harem- A group of animals known as a harem consists of one or more males, several females, and the offspring of those females. The dominant male drives away other men and maintains the group together.

The given question is incomplete, the complete question is,

Q. When would a make be expected to improve his fitness by attempting to mate at sea rather than establishing a harem.?

A. A large, competitively dominant male will do better matting at sea when small males are relatively abundant.

B. A large, competitively dominant male will do better matting at sea when suitable beaches are more common than are large, dominant males.

C. A small male will do better mating at sea when suitable beaches are rare and successfully defended by large males.

D. A small male will do better mating at sea when suitable beaches are more common than are large, dominant males.

To know more about fitness, click on the below link,

brainly.com/question/7265511

#SPJ4

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