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Question
In a breeding experiment, tall pea plants (TT) are crossed with dwarf pea plants (tt). If the resulting F1 plants are crossed with dwarf plants, the progeny consists of
In a breeding experiment, tall pea plants (TT) are crossed with dwarf pea plants (tt). If the resulting F1 plants are crossed with dwarf plants, the progeny consists of
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Solution
The correct option is D 1 taIl : 1 dwarf plant
- According to the law of segregation, the dominant (T) and recessive (t) alleles present in heterozygous tall (Tt) plant in F1 generation would segregate and deliver singly to gametes.
- Thus, it will make two types of gametes: 50% with “T” and 50% with “t”. The homozygous dwarf (tt) plant will produce a single type of gametes: all with “t”. Random fusion of these gametes will produce tall and dwarf progeny in 1 Tt :1 tt ratio.
- Only a cross between pure breeding plants obtains a uniform progeny of dominant or recessive characters, based on the genotype of pure-breeding parents.
- Thus, the correct answer is option D.
- According to the law of segregation, the dominant (T) and recessive (t) alleles present in heterozygous tall (Tt) plant in F1 generation would segregate and deliver singly to gametes.
- Thus, it will make two types of gametes: 50% with “T” and 50% with “t”. The homozygous dwarf (tt) plant will produce a single type of gametes: all with “t”. Random fusion of these gametes will produce tall and dwarf progeny in 1 Tt :1 tt ratio.
- Only a cross between pure breeding plants obtains a uniform progeny of dominant or recessive characters, based on the genotype of pure-breeding parents.
- Thus, the correct answer is option D.
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