CBSE 2023 · Region 1 · Set 3 · Q28 · 3 marks
Study the pedigree chart of a family given below and answer the questions that follow :(a)Is the disease in this pedigree chart a recessive or dominant disorder ? Give reason.(b)Identify the female individual in this family, who for sure is homozygous.(c)Genotype of which one individual cannot be identified in this pedigree chart ?(d)Identify a male who is definitely heterozygous.(e)Is this disease a sex-linked or an autosomal disorder ?
Study the pedigree chart of a family given below and answer the questions that follow :
(a)
Is the disease in this pedigree chart a recessive or dominant disorder ? Give reason.
(b)
Identify the female individual in this family, who for sure is homozygous.
(c)
Genotype of which one individual cannot be identified in this pedigree chart ?
(d)
Identify a male who is definitely heterozygous.
(e)
Is this disease a sex-linked or an autosomal disorder ?
Marking-scheme solution
(a) •Recessive
Individuals $\displaystyle 1$ and $\displaystyle 2$ don't have disease but their offspring individual $\displaystyle 3$ shows the disease.
(b) Individual $\displaystyle 3$ is homozygous
(c) Individual $\displaystyle 7$/$\displaystyle 8$
(d) Individual $\displaystyle 2$/$\displaystyle 5$
(e) Autosomal disorder
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CBSE Class 12 Biology past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.