1. Tardigrade
  2. Question
  3. Biology
  4. 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 ?

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Q. 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 ?

Principles of Inheritance and Variation

Solution:

Incomplete (partial or mosaic) dominance is the phenomenon where none of the two contrasting alleles or factors is dominant. The expression of the character in a hybrid or $F_1$ individual is intermediate or a fine mixture of the expression of the two factors (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.