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3 years ago

Two cell divisions mitosis or meiosis

2 answers:

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Cell division is the process by which a parent cell divides into two or more daughter cells.[1]Cell division usually occurs as part of a larger cell cycle. In eukaryotes, there are two distinct types of cell division: a vegetative division, whereby each daughter cell is genetically identical to the parent cell (mitosis),[2] and a reproductive cell division, whereby the number of chromosomes in the daughter cells is reduced by half to produce haploid gametes(meiosis). Meiosis results in four haploid daughter cells by undergoing one round of DNA replication followed by two divisions. Homologous chromosomes are separated in the first division, and sister chromatids are separated in the second division. Both of these cell division cycles are used in the process of sexual reproduction at some point in their life cycle. Both are believed to be present in the last eukaryotic common ancestor.

Prokaryotes (bacteria) undergo a vegetative cell division known as binary fission, where their genetic material is segregated equally into two daughter cells. All cell divisions, regardless of organism, are preceded by a single round of DNA replication.

For simple unicellular microorganisms such as the amoeba, one cell division is equivalent to reproduction – an entire new organism is created. On a larger scale, mitotic cell division can create progeny from multicellular organisms, such as plants that grow from cuttings. Mitotic cell division enables sexually reproducing organisms to develop from the one-celled zygote, which itself was produced by meiotic cell division from gametes. After growth, cell division by mitosis allows for continual construction and repair of the organism.[3] The human body experiences about 10 quadrillion cell divisions in a lifetime.[4]

The primary concern of cell division is the maintenance of the original cell's genome. Before division can occur, the genomic information that is stored in chromosomes must be replicated, and the duplicated genome must be separated cleanly between cells.[5] A great deal of cellular infrastructure is involved in keeping genomic information consistent between generations.

IrinaK [193]3 years ago

5 0

mitosis is the answer

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Answer:

As evolution became widely accepted in the 1870s, caricatures of Charles Darwin with the body of an ape or monkey symbolised evolution.

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3 years ago

What evidence supports the LAW OF CONSERVATION OF ENERGY?

photoshop1234 [79]

Answer:

Taking into account photosynthesis, the evidence that best supports the law of energy conservation is energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis (option 2).

Explanation:

Plants are autotrophic organisms, characterized by synthesizing their own nutrients by converting solar energy into chemical energy through photosynthesis.

During the process of photosynthesis, chloroplasts are capable of absorbing solar energy and converting it into glucose. This process involves the conversion of one type of energy into another.

With respect to the law of conservation of energy, it is necessary to consider:

In the universe there is a constant amount of matter and energy, which is neither created nor destroyed, but transformed.
Energy in an isolated system does not vary, unless it comes into contact with another system.
The amount of energy that is absorbed and obtained is equivalent.

In photosynthesis, the chloroplast is not an isolated system, but has contact with the outside and is capable of absorbing the energy of the sun. This energy will be used to obtain a product, glucose, in an amount proportional to the amount of energy absorbed.

Regarding other options:

1. In photosynthesis, it is not mechanical energy that is transformed into chemical energy.

3. Oxygen is a product of photosynthesis, during the process of chemical energy synthesis, from the combination of carbon dioxide, water and solar energy.

4. It is true that the sun gives off light energy that is absorbed by plants, but it does not explain how this energy is transformed into chemical energy.

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3 years ago

Gregor Mendel used pea plants to study Question 36 options: a. flowering. b. gamete formation. c. the inheritance of traits. d.

barxatty [35]

Answer:

Inheritance of traits

Explanation:

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3 years ago

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3 years ago

Selects asample of n= 20 pregnant rats and mixes alcoholwith their food for 2 weeks before the pups are born.one newborn pup is

Dafna11 [192]

Your answer would be:

n = 20 pups is recorded.

known that the average birthweight for regular rats (without exposure to alcohol) is μ = 5.6 grams.

sample of n= 20 pregnant rats and mixes alcohol with their food for 2 weeks before the pups are born.

One Newborn pup randomly selected from each litter.

A.). What type of test you would use, to test the hypothesis that, alcohol consumption during pregnancy reduces birth weights? Answer, There is one treatment group, pups of alcohol-fed rats, which is being compared to a known population of regular rats, so the most appropriate statistical test is the z-test.

B.). Would you use a one - tailed, or two - tailed test? Answer, The independent variable is the alcohol condition whether, or not, / the pup’s mother received alcohol while pregnant; The dependent variable is the birth weight

C.). What would be an appropriate measure of effective, size to report?Answer, The scale of measurement for the independent variable is nominal. The scale of the dependent variable (birth weight) is ratio; effective size would be measured by Cohen's d, or r2.

Hope that helps!!!! : ) Answer: zx, Because, there is only one sample; and, it is compared to all the previous patients,/population. The σ, is given.

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3 years ago