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Question
A family consists of two parents and their five children and the pedigree chart below shows the inheritance of the trait colour blindness .
(i) Who is colour blind in parents - Father or Mother?
(ii) How many daughters and sons have beeen born in the family?
(iii) What does the child 1 indicate about this trait?
(iv) Complete the depiction of all probabilities of the trait among the children 2-5 in the chart.
(v) On which chromosome is the gene of this trait located?
(vi) Name one other trait in humans which follows the similar mode of inheritance.
Solution
(i) Father is color blind.
(ii) 3 daughters and two sons.
(iii) Child 1 is color blind.
(iv) All daughters from 2-5 are carriers while all the sons are normal.
(v) X chromosome.
(vi) Haemophilia.
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