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CUET · BIOLOGY · PYQ PAPER 2023

Read the given paragraph and answer the question:
Humans have 23 pairs of chromosomes. 22 pairs are exactly same in both males and females; these are the autosomes. A pair of X-chromosome are present in the female, whereas the presence of an X and Y chromosome are determinant of the male characteristic.
A number of disorders in human beings have been found to be associated with the inheritance of changed or altered genes or chromosomes. Broadly, genetic disorder may be grouped into two categories-Mendelian disorders and Chromosomal disorders
A colour blind man marries a carrier woman. Choose the possible progeny outcome.

  1. A All sons are born colourblind, while 50% the daughter born will be normal.
  2. B All children (sons and daughters) are born colour blind.
  3. C All daughters are normal whereas 50% of the sons born will be colour blind.
  4. D 50% of daughters and 50% of sons born will be colour blind.
Verified Solution

Answer & Solution

Correct Answer

(D) 50% of daughters and 50% of sons born will be colour blind.

Step-by-step Solution

Detailed explanation

Man genotype: \( \text{X}^\text{c}\text{Y} \) Woman genotype: \( \text{X}^\text{C}\text{X}^\text{c} \) Possible offspring genotypes: \( \text{X}^\text{C}\text{X}^\text{c}, \text{X}^\text{c}\text{X}^\text{c}, \text{X}^\text{C}\text{Y}, \text{X}^\text{c}\text{Y} \) Phenotypic…