MCQ
Which of the following is an example of a point mutation?
- ATyphoid fever
- BNight blindness
- CSickle cell anaemia
- DDown's syndrome
Explanation:
A mutation is a type of mutation in which only one or few nucleotides are changed in a gene sequence. Sickle-cell anaemia is caused by a point mutation in the β - globin chain of haemoglobin. As a result, the hydrophilic amino acid, glutamic acid is replaced with the hydrophobic amino acid, valine at the sixth position.
Typhoid fever is a bacterial disease caused by the bacteria Salmonella typhi or Salmonella paratyphi.
Night blindness is caused by vitamin A deficiency.
Down's syndrome is a chromosomal abnormality called as trisomy 21 in which an extra copy of the chromosome 21 is present.
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tall red |
tall white |
dwarf red |
dwarf white |
respectively
Assertion $A$: Endometrium is necessary for implantation of blastocyst.
Reason $R$: In the absence of fertilization, the corpus luteum degenerates that causes disintegration of endometrium.
In the light of the above statements, choose the correct answer from the options given below:
Reason : It also has high blood supply and erectile tissue.