A family consists of two parents and their five children and the pedigree chart below shows the inheritance fo the trait colour blindness in them.

(a) Who is colour blind in the parents - the Father or the Mother?
(b) How many daughters and how many sons have been born in the family?
(c) What does the child 1 indicate about this trait?
(d) On which chromosome is the gene of this trait located?
(e) Name one other trait in humans which follows the similar pattern of inheritance.

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Solution

(a)Father
(b) Two sons and three daughters
(c) The child 1 (daughter) is colour blind
(d) X chromosome
(e)Haemophilia

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Q. A family consists of two parents and their five children and the pedigree chart below shows the inheritance of the trait colour blindness.
Figure

(i) Who is colour blind in the parents - Father or Mother?
(ii) How many daughters and sons have been 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.

This pedigree shows the inheritance of colour blindness or sex-linked trait. Is this trait dominant or recessive? Is the mother of the colourblind girl in the F3 generation colourblind, a carrier or a person with normal colour vision? Explain. [4 MARKS]