Refer the given statements
(i) Incomplete or mosaic inheritance is an example of pre-Mendelian concept of blending inheritance
(ii) Test cross is a special type of back cross
(iii) Chromosomal aberrations are commonly observed in cancer cells
(iv) Thalassaemia is a Mendelian disorder
Which of the above statements are correct ?

Options

A. (i) and (ii) only
B. (ii),(iii) and (iv)
C. (ii) and (iv) only
D. (i) and (iv) only

Answer

B

Explanation

Incomplete (partial or mosaic) dominance is the phenomenon where none of the two contrasting alleles or factors is diminant. The expression of the character in a hybrid or `F_(1)` individual is intermediate or a fine mixture of the expression of the two factor (as found in homozygous state). Incomplete or mosaic inheritance is not an example of pre-mendelian concept of blending inheritance because the parental types reappear in the `F_(2)` generation.