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jeka94
3 years ago
5

Sally and Maria hypothesized that earthworms lived only in dark, damp places. They measured a one-meter square in a shady spot n

ear a stream. They dug through the soil and collected earthworms. They collected 43 worms. They repeated the experiment in several locations, sunny and dry included. They found the most worms in the shady, damp plot near the stream. Several other groups of science students carried out the same experiment and got similar results. This is an example of
A) bias.
B) repetition.
C) replication.
D) validity.
Biology
2 answers:
xeze [42]3 years ago
8 0

Answer: C) replication.

Explanation:

Replication in experiments is the process by which the entire experimental process is repeated as done by the previous scientists, keeping in mind all the necessary requirements and experimental conditions so as to determine the correctness of the experimental methodology, relationship between the variables, correctness of the results and other parameters.

Here, several group of students are repeating the same experiment and getting the same results this process is called as replication.  

bekas [8.4K]3 years ago
4 0
Because other scientists did the experiment and got the same results it's replication. the other group replicated the experiment and we're able to replicate the results
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1. The difference between the normal hemoglobin protein DNA sequence and the sickle cell hemoglobin DNA sequence is a base to base shift, in this case adenine (GAG) to thymine (GTG).

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<u>Normal hemoglobin protein in a RBC</u>

DNA                 CTG ACT CCT GAG GAG AAG TCT

Amino acids     Leu  Thr   Pro   Glu   Glu   Lys   Ser

<u>Sickle cell hemoglobin protein in a RBC</u>

DNA                 CTG ACT CCT <em>GTG</em> GAG AAG TCT

Amino acids     Leu  Thr   Pro   <em>Val</em>   Glu   Lys   Ser

When GAG is transcribed to mRNA, the CUC codon is obtained, which codes for glutamic acid. Thymine substitution causes the DNA sequence to change to GTG, which is transcribed as CAC, the codon that encodes the amino acid valine. The <u>change from glutamic acid to valine in β-globin causes an altered hemoglobin, giving the abnormal erythrocytes observed in sickle cell disease</u>.

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