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Biology · 2023 · 3 marks
CBSE 2023 · Region 1 · Set 1 · Q23
Study the given pedigree chart and answer the questions that follow. (a) Is the trait given in the chart dominant or recessive? Give reason in…
Study the given pedigree chart and answer the questions that follow.
(a)
Is the trait given in the chart dominant or recessive ? Give reason in support of your answer.
(b)
Is this trait autosomal or sex-linked ? Give reason in support of your answer.
(c)
Write the possible genotypes of the children numbers '$\displaystyle 1$' and '$\displaystyle 3$' of the second generation.
Marking-scheme solution
(a)
Recessive trait, both the parents in generation I do not express the trait yet it appears in the progeny.
(b) Autosomal trait, both male and females have equal chances of getting the trait.
(c) Child '$\displaystyle 1$' : Aa/AA, Child '$\displaystyle 3$' : Aa
//
(a) Recessive trait, both the parents in generation I do not express the trait, yet it appears in the progeny.
(b) Sex linked trait, comparatively more male are getting affected.
(c) Child '$\displaystyle 1$' : XY, Child '$\displaystyle 3$': X' X(carrier)
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