What is positive feedback loop?

1 answer:

4 0

enhance or amplify changes; this tends to move a system away from its equilibrium state and make it more unstable.

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Explain the role of time in evolution

Dmitriy789 [7]

Answer:

The concept of immense periods of geological time are necessary to account for the possibility of the small changes resulting slowly into major changes. Thus long periods of time are essential for Darwin's theory of slow uniform biological changes being responsible for the Origin of the Species.

Explanation:

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Anything that causes disease is called a O virus O protist O pathogen O gene

MA_775_DIABLO [31]

Virus
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A pea plant with genotype PP (purple flowers) mates with a plant with the genotype pp (white flowers). The dominant allele P cod

Basile [38]

In the question, it is given that the purple flowers are dominant to the white flowers. The dominant allele for the flower is P, and the recessive allele for the flower is p.

So, the possible genotypes of the purple flower is - PP or Pp.

And, the possible genotype of the white flower is - pp.

The cross1 shows the cross between PP and pp.

The phenotype of all the offspring in the cross 1 is Purple, and the genotype is pp. Hence, the possibility of getting purple flowers in the progeny is 100%.

Homozygous dominant genotype is the condition, in which the plant's alleles are same and both are dominant.

The cross 2 shows the cross between Pp and pp:

The homozygous dominant genotype (PP) is 1 and the total number of progeny is 4. So, the probability of occurence of PP is 1/4 or 25%.

Hence, the first blank can be filled with 100% and the second blank can be filled with 25%.

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4 years ago

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The Central Dogma is represented by the schematic above. Name the two stages involved in protein synthesis and explain what occu

liubo4ka [24]

The first stage is TRANSCRIPTION, it is a process that takes place in the nucleus or in the cytosol, the DNA acts as a template to transcript it's information forming a new mARN molecule which contains the codons that codes an specific amino acid.

This mARN molecule will exit the nucleus and will be translated in the ribosomas that can be found in the cytosol or the Endoplasmic Reticulum. during TRANSLATION the mARN will be decoded to produce a polypeptide chain, this happens when the ribosome induces the binding of a tRNA anticodon sequences that are complementary to the mRNA codons, this will tell the ribosome which amino acid is needed to form the polypeptide chain.

It's important to clarify that in Prokaryotic cells, both of these stages take place in the cytosol since it doesn't have organelles binded by membrane unlike the Eukaryotic cells where the Transcription happens in the nucleus and the translation happens in the cytosol or endoplasmic reticulum

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When magma hardens in a volcanos pipe the result will eventually be a landform called a

Ludmilka [50]

99% sure it is volcanic neck
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4 years ago