Gentics And Evoloution - Study Mode

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[#361] Consider the following statements regarding the origin of polyploidy and choose the correct answer: 1. The egg may be fertilized by more than one sperm 2. There may be a failure of mitosis 3. Triploids may arise as a result of fertilization of unreduced gametes 4. An autotetraploid may arise either by the doubling of chromosomes or fertilization between two different gametes

(A) Only 1 is true

(B) Only 2 and 3 are true

(C) Only 1, 2 and 3 are true

(D) 1, 2, 3 and 4 are true

Correct Answer

(D) 1, 2, 3 and 4 are true

[#362] Autopolyploidy can be induced artificially by the use of a chemical called

(A) Pyrethrene

(B) Colchicine

(C) Serpentine

(D) Nicotine

Correct Answer

(B) Colchicine

[#363] Consider the following statements regarding genetic code and choose the correct answer: 1. The genetic code is degenerate 2. In all amino acids the first two bases are the same in all the codons that represent a particular amino acid 3. The number of codons an amino acid can claim is proportional to the frequency of the amino acid in proteins 4. Amino acids with codons ending in U or A also have codons ending in C or G respectively

(A) Only 1, 2 and 3 are true

(B) Only 2, 3 and 4 are true

(C) Only 1, 3 and 4 are true

(D) Only 1 and 4 are true

Correct Answer

(C) Only 1, 3 and 4 are true

[#364] The characteristics of 'The chromosome theory of linkage', formulated by Morgan and Castle, include:

(A) Genes that show linkage are situated in different chromosomes

(B) Genes are arranged in a linear fashion in the chromosome i.e., linkage of genes islinear

(C) The distance between the linked genes is directly proportional to the strength of linkage

(D) Linked genes remain in a new combination during course of inheritance

Correct Answer

(B) Genes are arranged in a linear fashion in the chromosome i.e., linkage of genes islinear

[#365] The relationship between the sequence of bases in DNA / RNA and the sequence of amino acids in a polypeptide chain is called the

(A) Codon

(B) Anticodon

(C) Doublet code

(D) Genetic code

Correct Answer

(D) Genetic code