Why are the two strands of the double helix "perfect and specific compliments"?

1 answer:

7 0

Because for the strands to form a double helix the base pairs have to match perfectly (adenine with thymine and cytosine with guanine) in DNA , and if a strand of RNA is paired with a split strand of DNA it goes adenine with uracil and cytosine with guanine (uracil replaces thymine)

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Speciation caused by geographic division is called A) allopatric speciation B) genetic speciation C) parapatric speciation D) sy

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Answer:

A) allopatric speciation

Explanation:

Allopatric speciation is a type of speciation that is caused due to geographical isolation that results in the separation of the population of the same species that once inhabited the same geographical area.
Due to this geographic separation, the species become so isolated that no more gene flow occurs between the two species and therefore, with time new species get formed.
The various geographic changes that can contribute to the separation of the two species can be - formation of mountains, islands, water bodies, glaciers, etc.
The populations that get separated due to the geographic barriers are subjected to different selective pressures and hence, speciation occurs.

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Zepler [3.9K]

In studies of disease-discordant monozygotic twin pairs, one searches each pair for epigenetic differences.

The DNA is the genetic material that is found in human beings. The DNA of a person contains the information that could be passed on from parents to the offspring and this is the basis of inheritance.

In studies of disease-discordant monozygotic twin pairs, one searches each pair for epigenetic differences , focusing on those areas of DNA that are thought to be involved in the disorder.

Learn more about DNA:brainly.com/question/264225

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Answer:

Explanation:

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