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kirza4 [7]
3 years ago
6

Sheena and tina are identical twins who developed from a single zygote and share identical dna. nevertheless, as they develop, d

ifferences in physical and psychological characteristics become evident. these differences are due to:
Biology
1 answer:
BabaBlast [244]3 years ago
5 0

The answer is epigenetic changes in their DNA. These are heritable changes in gene function that do not involve changes in the DNA sequence. This occurs through methylation patterns and histone modification on the DNA strand that may result from external or environmental factors.






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Helppppp pls ! I can’t understand this question.
Artist 52 [7]

Answer:

The correct option is D. The nerve and red blood cells will turn on and off different portions of their DNA, using different genes to make different proteins.

Explanation:

A zygote is totipotent which means it has the ability to differentiate into any cell type found in the body along with the placental cells.

The nerve and red blood cells are specialized cells and they cannot differentiate into any other cell type.

All cells in the body are formed from the zygote. All the cells in the body have the same chromosomes and the same genes. However, these cells become specialized because certain part of the DNA is activated in one type of cell which helps it perform its function. Different genes are activated in different specialized cells which are able to transcribe and translate.

6 0
4 years ago
WHY (not how) is it possible for one organism to express genes from another organism? (i.e. an E.coli bacterial cell expressing
SCORPION-xisa [38]

Answer:

Because of the universality of the genetic code, the polymerases of one organism can accurately transcribe a gene from another organism.

6 0
2 years ago
if your corpus collosum were severed,could your right postcentral gyrus know what your left hand was doing ?why or why not
Masja [62]

I would make an educated guess to say yes because the left and right hemispheres control opposite sides of the body.

3 0
3 years ago
Which group serves as the control​ group? A. Group 2 serves as the control group because this group corresponds to the standard
Reil [10]

Answer:

First, let's add the missing piece of information

A school psychologist wants to test the effectiveness of a new method of teaching FrenchFrench. She recruits 100100 firstfirst​-grade students and randomly divides them into two groups. Group 1 is taught by means of the new​ method, while group 2 is taught by traditional methods. The same teacher is assigned to teach both groups. At the end of the​ year, an achievement test​ (graded on a scale from​ 1-10) is administered and the results of the two groups are compared.

The CORRECT ANSWER IS A.

A. Group 2 serves as the control group because this group corresponds to the standard method that will be compared to the other method.

Explanation:

A control group

The control group acts as a baseline treatment that is employed in contrasting it to the other form(s) of treatments.

Ex: In this case study, a school psychologist wants to test the effectiveness of a new method of teaching French, to see if the ones taught by using a new method (are placed in group 1) do better in learning French than those taught with the traditional method (are placed in group 2). The students being taught French with the traditional method (group 2) would serve as the control group (as this is the present, proven and acceptable practice of teaching French. The factor is the method of teaching French. There are two treatments: new method and traditional method.

Therefore, the option A. is THE CORRECT ANSWER

A. Group 2 serves as the control group because this group corresponds to the standard method that will be compared to the other method.

6 0
3 years ago
When are scientific ideas modified?
Rashid [163]
When new emperical evidence is discovered
5 0
3 years ago
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