Principles of Inheritance and Variation Question 73

73. Probability of four sons to a couple is

[2001]

(a) $\frac{1}{4}$

(b) $\frac{1}{8}$

(c) $\frac{1}{16}$

(d) $\frac{1}{32}$

Show Answer

Answer : c

Hints & Solution

(c)

(c) $(0^{*})$
Parents $x$
Offspring $XX XX$
daughters
XY XY
sons
Probability of son $=\frac{2}{4}=\frac{1}{2}$
Probability of four son $=(\frac{1}{2})^{4}=\frac{1}{16}$