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expeople1 [14]
3 years ago
10

Escherichia coli bacteria can control gene expression during changes in environmental conditions. Analyze the example of gene ex

pression of the bacteria below:
Which statement best explains how the genes are being regulated?

a. The genes are off when the initiating chemical is present.
b.The initiating chemical bonds directly to the DNA and blocks the metabolism.
c.The operon is turned on only when the stimulating chemical is present.
d.The genes are turned off by the unbound repressors.

Biology
1 answer:
Lelechka [254]3 years ago
5 0

Answer:

Is A or C   because The initiating chemical bonds does not directly to the DNA and blocks the metabolism, the repressor in the picture bind to protein and then blocks it ,so B is not correct,  and D is not correct because it is not an unbound repressor that turned off the gene(if you know the answer, please help me, I'm stuck with this question too :)  )

Explanation:

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B) Asia : by using above strategy we get,

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Which term describes the study of the distribution of genetic traits and the allelic changes that occur within a population? pop
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Population genetics

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Antennae development in ants is thought to be a trait controlled by maternal effect. In ants, zig-zag coils are dominant to curl
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Answer:

a. Her mother has zig-zag antennae.

b. Her brother has zig-zag antennae.

Explanation:

<u>Available data</u>:

  • Antennae development ⇒ controlled by maternal effect
  • Zig-zag coils are dominant
  • Curly coils are recessive
  • A female develops zig-zag coils

Maternal effect: Refers to the influence of the “environment provided by the mother” on the progeny phenotype. The mother´s genotype directly determines the progeny phenotype. Even though the progeny has a different genotype, it is irrelevant, as well as the father´s genotype or phenotype. This means that no matter what is the genotype of the offspring, all of them will express the same phenotype as their mother. The maternal effect is commonly seen in insects and might be seen in some mammals and plants.

So, if a female has zig-zag coils, this means that the mother also has zig-zag antennae and that all the brothers and sisters of this female ant have zig-zag antennae, independently of their genotype.

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