In which of the following traits does the heterozygous condition show a phenotype different from the homozygous dominant phenotype?
A and B only
C and D only
C, D, and E only
(E) Phenylketonuria – Aa Choose the correct answer from the options below:
B and C only
Text Solution
Verified by ExpertsD
Pea seed shape - Bb
round (dominant), 
wrinkled (recessive).
Heterozygous 
round, same as homozygous dominant (BB).
Follows Mendel's dominance → phenotype not different.
Human skin colour - AaBbCc
Controlled by polygenic inheritance (multiple genes additively).
Heterozygotes show intermediate shades, not same as any homozygote.
Phenotype different from homozygous dominant.
Starch grain size in plants - Bb
Shows incomplete dominance (heterozygote has intermediate starch grain size).
Phenotype different from homozygous dominant.
Blood group inheritance - 
is codominant with 
, but 
is dominant over 
.
blood group A (same as 
).
Not different from homozygous dominant.
Phenylketonuria - Aa
Autosomal recessive Mendelian disorder.
carrier, but phenotypically normal (same as AA).
Not different.
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