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makkiz [27]
3 years ago
7

HHow do you some cells become brain cells and others become skin cells when the DNA and all the cells is exactly the same in oth

er words if the instructions are exactly the same how does one so I'll become a brain cell in another a skin cell?
Biology
1 answer:
Bezzdna [24]3 years ago
5 0

Explanation:

In the early days of development, in an embryo, the cells are pluripotent and can differentiate into any kind of cell of the organism. As the embryo develops, autocrine and paracrine signaling between the cells of the embryo causes the cells to migrate to particular regions of the embryo and begin differentiating into respective parts of the organism. This signaling causes differential silencing of particular genes of the cells depending on the type of cells they will differentiate into. As the embryo develops into a fully grown organism, these cells lose potency (except for stem cells) and become fully differentiated into respective limbs or organs of the organism.

Learn More:

For more on embryology check out;

brainly.com/question/11484135

brainly.com/question/12777212

#LearnWithBrainly

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In the rat, the allele for red eye colour is dominant over the alleles for brown colour. Consider a cross between a rat that is
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Answer:

1) RR x rr

2) Shown below

3) 100% Rr with red eyes

4) Punnett square shown (Rr x Rr)

5) 25% of the offspring are h0m0zygous dominant with red eyes (RR), 50% are heterozygous with red eyes (Rr), and 25% are h0m0zygous with brown eyes (rr)

Explanation:

Let's say the allele for red eyes is R and the allele for brown eyes is r.

1. A cross between a h0m0zygous dominant (two copies of the dominant allele, R) and h0m0zygous recessive (two copies of the recessive allele, r) is: RR x rr

2.                            R                  R

                  r          <em>Rr                Rr</em>

                 

                  r          <em>Rr                Rr</em>

<em />

The F1 generation is shown in the Punnett square above.

3. The F1 generation are 100% Rr. They are heterozygous. Since red (R)                     is dominant, the rats all have red eyes

4. A cross between the F1 generation (Rr x Rr) gives the F2 generation

                              R                  r

                  R         <em>RR              Rr</em>

                 

                  r          <em>Rr                rr</em>

<em />

5. 25% of the offspring are h0m0zygous dominant with red eyes (RR), 50% are heterozygous with red eyes (Rr), and 25% are h0m0zygous with brown eyes (rr)

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