Question
List the salient features of genetic code###Give important feature of genetic code###Write any six main teatares of genetic code
✓
Answer
→ The salient features of genetic code are as follows:
(i) The codon is a triplet. 61 codons code for amino acids and 3 codons do not code for any amino acids, hence they function as stop codons.
(ii) Some amino acids are coded by more than one codon, hence the code is degenerate.
(iii) The codon is read in mRNA in a contiguous fashion. There are no punctuations.
(iv) The code is nearly universal:for example, from bacteria to human UUU would code for Phenylalanine (phe). Some exceptions to this rule have been found in mitochondrial codons, and in some protozoans.
(v) AUG has dual functions. It codes for Methionine (met), and it also act as initiator codon.
(vi) UAA, UAG, UGA are stop terminator codons.
(i) The codon is a triplet. 61 codons code for amino acids and 3 codons do not code for any amino acids, hence they function as stop codons.
(ii) Some amino acids are coded by more than one codon, hence the code is degenerate.
(iii) The codon is read in mRNA in a contiguous fashion. There are no punctuations.
(iv) The code is nearly universal:for example, from bacteria to human UUU would code for Phenylalanine (phe). Some exceptions to this rule have been found in mitochondrial codons, and in some protozoans.
(v) AUG has dual functions. It codes for Methionine (met), and it also act as initiator codon.
(vi) UAA, UAG, UGA are stop terminator codons.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
- Explain any two defence mechanisms plants evolved against their predators.
- How does predation differ from parasitism?
- How does the Hardy - Weinbergís expression (p2 + 2pq+ q2 = 1) explain that genetic equilibrium is maintained in a population.
- List any two factors that can disturb the genetic equilibrium.
A cross is made between different homozygous pea plants for contrasting flower positions.
→- Find out the position of flowers in $F_1$ generation on the basis of genotypes.
- Work out the cross upto $F_2$ generation.
- Compute the relative fraction of various genotypes in the $F_2$ generation?
How are assisted reproductive technologies helpful to humans? How are ZIFT and GIFT different from intrauterine transfers? Explain.
Practise drawing various animals and plants.
Explain giving one example, how co-extinction is one of the cause of biodiversity loss? List the other three causes also.
Write in what context did Darwin use the terms 'fitness', 'survival' and 'selection' while elaborating on the mechanism of evolution.
The following graph shows the species-area relationship. Answer the following question as directed.
- Name the naturalist who studied the kind of relationship shown in the graph. Write the observation made by him.
- Write the situations as discovered by the ecologists when the value of 'Z' (slope of the line) lies.
- 0.1 and 0.2
- 0.6 and 1.2
- When would the slope of the line 'b' become steeper?
Mrs. Peter and Mrs. James had babies at the same hospital. Mrs. Peter took home a girl, Nancy and Mrs. James received a boy, Richard. However, Mrs. James was certain she gave birth to a girl and brought suit against the hospital. Blood tests showed that Mr. James was type O, Mrs. James was type AB and Mr. and Mrs. Peter were both type B. Nancy was type A and Richard was type O. List the possible genotypes of each individual and then indicate the correct parents for each child.
Genotypes :
Genotypes :
- Mrs. Peter ____________.
- Mr. Peter ______________.
- Nancy _____________.
- Mrs. James _________________.
- Mr. James ________________.
- Richard _______________.
- Whose baby is Nancy?
- Whose baby is Richard?
Both Haemophilia and Thalassemia are blood related disorders in humans. Write their causes and the difference between the two. Name the category of genetic disorder they both come under.