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which of the following statements describes the central dogma of molecular biology?

A.Biological information in a cell passes from DNAto RNA to protiens

B.Biological information in a cell passes from RNA to protiens to DNA

C.Biological information in a cell passes from RNA to DNA to protiens

D.Biological information in a cell passes from protien to RNA to DNA


how many chromosomes are shown in a normal human karyotype?

A.2

B.23

C.44

D.46

Which of the following has the disadvantage of possibly bringing two ressesive alleles together and causeing a genetic defect?

A.inbreeding

B.hybridization

C.genetic engineering

D.transformation

Verified Answer :

Kalahira

Q1. The answer is A.Biological information in a cell passes from DNAto RNA to proteins. The biological information is the part of DNA. During transcription, DNA is transcribed into RNA which now serves as a template for the synthesis of proteins. Thus, the central dogma of molecular biology describes how biological information in a cell passes from DNA to RNA to proteins.
     
Q2. The answer is D. 46. In a human diploid somatic cell (2n), there are 23 chromosomes present in two copies - 22 pairs of autosomes and 1 pair of sex chromosomes. So, in a normal human karyotype there will be in total 46 chromosomes (23 pairs in 2 copies: 23 × 2 = 46).
   
Q3. The answer is A. inbreeding. Inbreeding is a breed from closely related organisms. Inbreeding causes a decrease of genetic variation by increasing homozygosity. This way, it can cause the genetic defect by bringing two recessive alleles together.

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