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Biology · 2026 · 2 marks
CBSE 2026 · Region 2 · Set 2 · Q17
(a) Is it possible for a trait to be inherited by an organism but not expressed in its phenotype? Justify and illustrate your answer with a suitable…
(a)
Is it possible for a trait to be inherited by an organism but not expressed in its phenotype? Justify and illustrate your answer with a suitable Mendelian Cross.
OR
(b)
Explain the two major approaches used while sequencing the total DNA from a cell.
Marking-scheme solution
• Yes
•
P - parents : TT (Tall, Female) X tt (Dwarf, Male)
Gametes : T, T and t, t
F1 - generation : Tt (All Tall plant)
F2 - generation :
The above cross shows that dwarf trait was not expressed in F1 generation but reappears in F2 generation showing that characters are inherited but not expressed in its phenotype.
Expressed Sequence Tags, To identify all the genes that are expressed as
RNA.
Sequence Annotation, Blind approach of simply sequencing the whole set of genome having all coding and non coding sequences.
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