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Maru [420]
3 years ago
6

How can a zygote receive an abnormal chromosome number?

Biology
1 answer:
noname [10]3 years ago
6 0

Explanation:

Some chromosomal conditions are caused by changes in the number of chromosomes. These changes are not inherited, but occur as random events during the formation of reproductive cells (eggs and sperm). An error in cell division called nondisjunction results in reproductive cells with an abnormal number of chromosomes

Chromosome abnormalities often happen due to one or more of these: Errors during dividing of sex cells (meiosis) Errors during dividing of other cells (mitosis) Exposure to substances that cause birth defects (teratogens)

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The oil killed and injured seabirds, sea otters, harbor seals, bald eagles, orcas and other wildlife. Eventually, oil from the spill affected more than 1,000 miles of Alaska's remote and rugged coastline.

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Sensory receptors found in the skin which are specialized to detect temperature pressure and pain
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5 0
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In which population would the rate of genetic drift be the greatest?
katrin2010 [14]

Answer:

A genetic drift is defines as the change in the allele frequency of an existing population. It arises as a result of random variation in a population. The rate of genetic drift would be greatest in a small population that are geographically isolated from the parent population. A change in the allele frequency of  a population as a result of chance rather than the natural selection.




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Which adaptation helps to prevent water loss in conifers
horrorfan [7]
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3 years ago
why is protein synthesis different in prokaryotes and eukaryotes in prokaryotes dna is stored in the cytoplasm in prokaryotes dn
IRINA_888 [86]

In eukaryotes, it exists slowly because the pre- mRNA exists first synthesized in the nucleus and after splicing, the mature mRNA arrives in the cytoplasm for translation.

Therefore, the correct answer is option B. In prokaryotes, DNA is stored in the cytoplasm.

<h3>Why protein synthesis exists different in prokaryotes and eukaryotes? </h3>

The genetic material DNA in prokaryotes forms a cluster in one kind of cytoplasm. This exists named the nucleoid. This exists because they don't contain a well-structured nucleus with a nuclear membrane.

Due to this, the method of transcription in prokaryotes takes place in the cytoplasm, constituting a polycistronic mRNA. This mRNA later experiences translation to contain any number of proteins.

The method of protein synthesis exists faster in prokaryotes as the whole procedure takes place in the cytoplasm.

In eukaryotes, it exists slowly because the pre- mRNA exists first synthesized in the nucleus and after splicing, the mature mRNA arrives in the cytoplasm for translation.

Therefore, the correct answer is option B. In prokaryotes, DNA is stored in the cytoplasm.

To learn more about prokaryotes refer to:

brainly.com/question/1288013

#SPJ4

The complete question is:

Why is protein synthesis different in prokaryotes and eukaryotes?

A. In prokaryotes, DNA is a strand instead of a circle

B. In prokaryotes, DNA is stored in the cytoplasm

C. In prokaryotes, DNA is made of amino acids

D. In prokaryotes, DNA is made of nucleic acids

4 0
2 years ago
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