Is it necessary that always tallness is a dominant trait? Or blood group A is dominant over O?

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Solution

Dear student,
Tallness is a dominant trait but it is determined by the genotype of the trait. If the genotype is homozygous dominant then the trait is tall phenotypically. If the genotype is heterozygous dominant then again the trait is tall phenotypically. But if the genotype is homozygous recessive then the trait is dwarf phenotypically. So, tallness or dwarfness is determined by the contrasting allele present on the locus of the chromosome for that trait.
Yes, gene for blood group A is dominant over blood group o.

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What is an allele? And how is a dominant trait is identified for example between tall and dwarf the dominant trait is tallness thats ok but how the dominant trait is identified please answer this briefly

A cross between a tall plant (TT) and short plant (tt) resulted in pregeny that were all tall plants because :

(a) tallness is the dominant trait (b) shortness is the dominant trait

Question 3
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