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4.Principles of Inheritance and Variation
medium
In Huntington’s disease, the unaffected persons are homozygous for normal allele $h$. The following is erroneous because
A
it shows both male and female affected by Huntingtons disease
B
either person $6$ or $7$ should have the disease, if individual $11$ shows the disease.
C
at least one of the $2$ children $(8,\,9)$ should have the disease
D
all of these
(AIIMS-2015)
Solution
Since the offspring number $11$ is affected (diseased) either of the two parents $6$ or $7$ have to be affected.
Standard 12
Biology
