Answer
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Hint: The offsprings produced would be either heterozygous dominant or homozygous dominant.
Complete answer: A pure tall plant has the genotype TT and the heterozygous tall plant has the Tt genotype.
We know that, T is dominant and t is recessive. It means ‘T’ allele (tall) dominates over ‘t’ (short).
Cross is shown between a pure tall (TT) and heterozygous tall plant (Tt) would produce:
Hence, the phenotypic ratio of TT : Tt = 1 : 1
The phenotype shows that TT & Tt both are tall plants and there are no short plants.
So, the correct answer is A. None are short
Note: The above cross is a monohybrid cross. A monohybrid cross is the one which takes place between two individuals with different alleles of a single genetic locus.
Complete answer: A pure tall plant has the genotype TT and the heterozygous tall plant has the Tt genotype.
We know that, T is dominant and t is recessive. It means ‘T’ allele (tall) dominates over ‘t’ (short).
Cross is shown between a pure tall (TT) and heterozygous tall plant (Tt) would produce:
Gametes | T | T |
T | TT(tall) | TT(tall) |
t | Tt(tall) | Tt(tall) |
Hence, the phenotypic ratio of TT : Tt = 1 : 1
The phenotype shows that TT & Tt both are tall plants and there are no short plants.
So, the correct answer is A. None are short
Note: The above cross is a monohybrid cross. A monohybrid cross is the one which takes place between two individuals with different alleles of a single genetic locus.
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