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Question
A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents?
A cross between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents?
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Solution
The correct option is D Tt and Tt
Monohybrid cross:
Monohybrid cross is a cross involving a pair of contrasting characters. For example, a cross between a tall plant and a dwarf plant.
Cross between TT and Tt:
Cross between TT (homozygous tall) and Tt (heterozygous tall) gives the first filial generation of all tall plants.
Cross between Tt and Tt:
Cross between Tt (heterozygous tall) and Tt (heterozygous tall) gives the first filial generation ratio of 3 (Tall) : 1 (Dwarf) plants.
In this case, a cross between tall plants is producing a mixture of tall and dwarf plants (fewer dwarf plants).
Cross between TT and TT:
Cross between TT (homozygous tall) and TT (homozygous tall) gives the first filial generation of all tall plants.
Cross between TT and tt:
Cross between TT (homozygous tall) and tt (homozygous dwarf) gives the first filial generation ratio of 1 (Tall) : 1 (Dwarf) plant.
In this case, although a mixture of tall and dwarf progenies are obtained, however, both the parents are not tall, hence, not in accordance with the condition given in the question statement.
Final answer b. Tt and Tt
Summary :
Cross between Tt (heterozygous tall) and Tt (heterozygous tall):
Monohybrid cross is a cross involving a pair of contrasting characters. For example, a cross between a tall plant and a dwarf plant.
Cross between Tt (heterozygous tall) and Tt (heterozygous tall) gives the first filial generation ratio of 3 (Tall) : 1 (Dwarf) plants.
In this case, although a mixture of tall and dwarf progenies are obtained, however, both the parents are not tall, hence, not in accordance with the condition given in the question statement.
Final answer:
b.) Tt and Tt
Monohybrid cross:
Monohybrid cross is a cross involving a pair of contrasting characters. For example, a cross between a tall plant and a dwarf plant.
Cross between TT and Tt:
Cross between TT (homozygous tall) and Tt (heterozygous tall) gives the first filial generation of all tall plants.
Cross between Tt and Tt:
Cross between Tt (heterozygous tall) and Tt (heterozygous tall) gives the first filial generation ratio of 3 (Tall) : 1 (Dwarf) plants.
In this case, a cross between tall plants is producing a mixture of tall and dwarf plants (fewer dwarf plants).
Cross between TT and TT:
Cross between TT (homozygous tall) and TT (homozygous tall) gives the first filial generation of all tall plants.
Cross between TT and tt:
Cross between TT (homozygous tall) and tt (homozygous dwarf) gives the first filial generation ratio of 1 (Tall) : 1 (Dwarf) plant.
In this case, although a mixture of tall and dwarf progenies are obtained, however, both the parents are not tall, hence, not in accordance with the condition given in the question statement.
Final answer b. Tt and Tt
Summary :
Cross between Tt (heterozygous tall) and Tt (heterozygous tall):
Monohybrid cross is a cross involving a pair of contrasting characters. For example, a cross between a tall plant and a dwarf plant.
Cross between Tt (heterozygous tall) and Tt (heterozygous tall) gives the first filial generation ratio of 3 (Tall) : 1 (Dwarf) plants.
In this case, although a mixture of tall and dwarf progenies are obtained, however, both the parents are not tall, hence, not in accordance with the condition given in the question statement.
Final answer:
b.) Tt and Tt
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