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Sindrei [870]
3 years ago
12

Tissue culture experiments with PDGF demonstrate that without this substance _____.

Biology
1 answer:
Sergeeva-Olga [200]3 years ago
5 0

Answer:

Answer is 2. Fibroblasts fail to divide.

Explanation:

Tissue culture experiment is the experiment where tissues are grown in an artificial medium. This involves the use of growth medium such as agar or broth. This process help to produce needed tissues in a short period of time.

Fibroblasts are cells which are found in the collective tissues, and they produce collagen. The collagen produced by the Fibroblasts play important role in tissue repair. Fibroblasts are regarded as the main cells in the connective tissue.

Note that, PDGF, which is Platelet -derived growth factor in full, is a growth factor regulating cell growth and it's division.

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Answer:

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The gene for the horns in unicorn has three alleles. If the frequency of the allele for twisted horns is represented by "p" and that of the hornless allele is represented as "q", then the frequency of the allele for the longhorn would be (r) = 1- (p+q).

This is due to the fact that the sum total of frequencies of all the possible alleles of a particular gene in a population in the Hardy Weinberg Equilibrium is always 1 (p+q+r =1). Now, putting the values of p and q in the formula to calculate the frequency of allele for the longhorn (r) = 1- (0.1 + 0.4) = 1-0.5 = 0.5

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