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(i) What is mutation? (ii) Describe how mutations arise (iii) State the factors that may cause mutation (iv) State the characteristics of mutations

      

(i) What is mutation? (ii) Describe how mutations arise (iii) State the factors that may cause mutation (iv) State the characteristics of mutations

  

Answers


Felix
i) Sudden change in the structure of DNA at a particular locus/chromosome/genes

ii)Mutations arise due to alterations in normal number of chromosomes,
change in a portion of a chromosome affecting one or more genes
by chromosomal aberration e.g. deleltion/duplication/substitution/inversion/translocation/crossing over
caused by mutagenic agents e. g. radiation (x-rays, ultra violet light, gamma rays) and chemicals e. g. mustard gas/colchicines.

iii) These are chemicals and radiations

a) Radiations Effects

X-rays gene/chromosome alteration

Ultra violet rays structural distortion of DNA

b) Chemicals Effect

colchicines prevents spindle formation

Cyclamate chromosome aberrations

Mustard gas chromosomes aberrations

Nitrous acid adenine in DNA is deaminated so behaves like guanine

Acridone orange addition and removal of bases of DNA

Formaldehyde

iv)a)arise suddenly
b) Are unpredictable
c) Random
d) Generally rare
e) Some are desirable while others are lethal
Anganifelix answered the question on April 17, 2018 at 12:04


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