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andrew11 [14]
3 years ago
13

Why would natural selection not occur without genetic variations in species?

Biology
1 answer:
Mumz [18]3 years ago
8 0

If you do not have variations to be selected by natural or sexual selection on their superior abilities to survive and reproduce successfully then nothing can be naturally selected against the immediate environment.
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In _______ organisms, all cellular activities take place within a single cell.
aivan3 [116]

single-celled

in single-celled organisms they perform activities such as eating and reproducing in just one cell.

4 0
3 years ago
The sum of all genetic traits in a population’s individuals at any given time:
navik [9.2K]
Gene pool
Sum of a population's genetic material at a given time.
The term typically is used in reference to a population made up of individuals of the same species and includes all genes and combinations of genes (sum of the alleles) in the population.
7 0
2 years ago
Tay-Sachs, which is a recessive lethal disease, results only when individuals possess two copies of the disease-causing allele.
VashaNatasha [74]

Answer:

a. Heterozygous individuals may pass on their copy of the disease-causing allele to offspring.

Explanation:

Tay-Sachs, which is a recessive lethal disease  ---- Let say the recessive lethal diseases is s

∴ it only results when an individual posses two copies of the diseases-causing allele i.e two copies of the disease will be ss.

Now, when two hetrozygous individuals crossed , it is obvious that each can pass on their copy of the disease-causing allele to the offspring.

Let show an illustration for the above statement.

Let the heterozygous individual be Ts, if Ts cross with another Ts;

we will have:

Ts × Ts

         T          s

T        TT        Ts

s        Ts          ss

the offspring are TT,Ts,Ts,ss

We can now see how the Heterozygous individuals pass on their copy of the disease-causing allele to the offspring (Ts).

8 0
3 years ago
why do polysaccharides like cellulose and peptidoglycan able to resist degradation and enzymatic activity
mixer [17]

Polysaccharides like Cellulose form insoluble micro-fibrils making it resistant to degradation and enzymatic activity.

<u>EXPLANATION: </u>

  • Polysaccharides components in general broken down monosaccharides and they are very little enough to be absorbed by the body.
  • But the polysaccharide like cellulose cannot be absorbed by our body.
  • Cellulose is made up of simple polymers that form insoluble micro-fibrils results in resistant to degradation and enzymatic activity.
  • Also, molecules of each micro-fibril are so tightly packed structure and prevent the penetration of enzymes.
  • Thus, cellulose degradation requires a complex enzyme and cellulose.
7 0
3 years ago
A group of organs that work together is called a _____________ .
NemiM [27]

Answer:

Organ system

Explanation:

Help this helps

8 0
3 years ago
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