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astraxan [27]
3 years ago
7

The fruit fly Drosophila melanogaster has an allele that confers resistance to DDT and similar insecticides. Laboratory strains

of D. melanogaster have been established from flies collected in the wild in the 1930s (before the widespread use of insecticides) and the 1960s (after 20 years of DDT use). Lab strains established in the 1930s have no alleles for DDT resistance. In lab strains established in the 1960s, the frequency of the DDT-resistance allele is 37%. Which statement is correct?a. Alleles for DDT resistance arose by mutation during the period of DDT use because of selection for pesticide resistance.
b. The evolutionary fitness associated with the heritable trait of DDT resistance changed once DDT use became widespread.
c. Resistance to DDT evolved in some fruit flies in order to allow them to survive.
Biology
1 answer:
kotegsom [21]3 years ago
3 0

Answer:

Option B, The evolutionary fitness associated with the heritable trait of DDT resistance changed once DDT use became widespread.

Explanation:

As per Darwin’s theory, few traits are inherited from the parents and some are acquired from the environment. Offspring can inherit genetic traits such as skin color, height, weight, eye color etc. from parent but the traits which offspring adopt as a response to their interaction with environment is specific to the individual only and is passed on if only it mutate the genes and is not behavioral in nature.  

Resistance to DDT is not a behavioral adaptation to environment. Hence,  the gene responsible for developing resistance against DDT fruit fly Drosophila melanogaster evolved with the increased usage of DDT. Genes which help offspring to survive in the persisting environment are passed on by the parents. Thus, in 1960 several fruit fly Drosophila melanogaster species had DDT resistant gene.

Option B, is correct

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4 0
2 years ago
An energy pyramid shows the amount of_______<br> available at each feeding level in an ecosystem
Amanda [17]

Answer:

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Explanation:

An energy pyramid shows the amount of energy available at each feeding level in an ecosystem.

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3 years ago
How dose observed pattern of magnetic reversals supports the theory of sea floor spreading
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4 0
3 years ago
If a small droplet of ordinary fat molecules is suspended in water, the fat molecules form a "ball of spaghetti" with no particu
kolbaska11 [484]

Answer:

Option 1, a charged end and a noncharged end

Explanation:

Complete question

If a small droplet of ordinary fat is suspended in water, the fat molecules form a "ball of spaghetti" with no particular orientation. But if a droplet of phospholipid molecules is put in water, all the molecules point outward, toward the water. Phospholipids are forced into this orientation because phospholipids have _____

  1.  a charged end and a noncharged end
  2.  three fatty acid molecules, all pointing in different directions
  3.  two fatty acid molecules pointing in different directions
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  5.  two charged ends

Solution

The structure of phospholipids consists of the following groups and molecules –  

a) A glycerol molecule  

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When the phospholipids are placed in  water, the molecule rearranges itself in a way that the hydrophobic head face inside and the hydrophilic head face outside thereby forming micelles.

Hence, option 1 is correct

3 0
3 years ago
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