HELP!

jeka57 [31]

Answer:

weird pictures to answer but rubber trees do nothing for an environment so they would be at the bottom then flees which are eaten by aphid insects which are eaten by birds at the top of the chain

3 0

3 years ago

In the proto-solar system nebula, gravity pulled matter together to form larger bodies. As they collided, what happened to these

Karolina [17]

Answer:

There was a release of immense heat within the bodies as they collided together as gravitational potential energy was converted into kinetic energy of the individual gas particles and then collisions between these particles converted this energy into heat.

Therefore, a massive amount of heat was released.

3 0

4 years ago

In Drosophila, a very prolific phenotypically normal female was crossed to a phenotypically normal male. All of the female offsp

erastova [34]

Answer:

22 mu

Explanation:

Since maximum number of flies are observed with +pb and s++ phenotype, they are the parental combinations.

Minimum number of flies are observed with +p+ and s+b phenotype hence they are the result of double crossover.

Gene order would be +bp and s++ since it is the only case which would lead to production of above mentioned double crossover. Hence gene b is in the middle of genes s and p.

Single cross over between genes s and b will give progeny +++ and sbp.

Map distance between s and b loci = recombination frequency =

(number of recombinants/ total progeny)*100

= [(single cross over between s and b + double crossover)/total progeny]*100

= [(102+106+7+5/1000]*100

=(220/1000)*100

=0.22*100

=22 mu

3 0

4 years ago

How does antibiotic resistance arise? how do hospitals and feedlots contribute to this phenomenon?

Stella [2.4K]

<span>Antibiotic resistance arises due to the evolution of the organisms they are designed to destroy. Subsequent generations of such organisms develop resistance to the antibiotic. Hospitals' overuse of antibiotics quickens the process, as does the administration of antibiotics to feedlot cattle, whose meat is consumed by people.</span>

8 0

3 years ago

People with sickle cell anemia have one incorrect amino acid in their beta chain. The first seven amino acids in the beta chain

denis-greek [22]

Answer: Valine

Explanation:

hemoglobin A (normal) is HbA, while hemoglobin S (present in people with sickle cell anemia) is HbS

A sequence of 146 amino acids is present in the Hemoglobin.

The first 6 amino acids in HbA are: valine, histidine, leucine, threonine, proline, and glutamic acid.

The first six amino acids in HbS is:

valine, histidine, leucine, threonine, proline, and VALINE

In Hbs, the 6th amino acid (Glutamic acid) has already been mutated to Valine, a nonpolar, branched amino acid.

5 0

3 years ago