Question

A mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants

bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. Write the

genetic makeup (genotype) of the tall parent.​

Answer 1

Answer:

According to the law of dominance, a dihybrid cross between two pure-breeding varieties yields uniforms F_1F1 generation of all dominant offspring. Since here F_1F1 generation consists of short plants with violet flowers and tall plants with violet flowers in a 1:1 ratio; the dominant parent is not purebred. The absence of a dominant allele for flower color (violet) would make the phenotype of dominant parent tall with white flowers. The appearance of the recessive trait in F_1F1generation (dwarfism) confirms the presence of one recessive allele in the dominant parent and makes it heterozygous for plant height (Tt). Since all F_1F1 generation has a violet flower, the dominant parent is homozygous for flower color. If the dominant parent was double heterozygous (TtWw), the F_1F1generation would exhibit recessive traits of both plant height and flower color. But all F_1F1generation exhibits violet flowers which confirm that the dominant parent is homozygous for flower color...

Explanation:

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Answer 2

Answer:

The condition explained is a dihybrid cross which involves two characters in a single plant.

The condition explained is a dihybrid cross which involves two characters in a single plant.In the given cross, the parent pea plants are of two types:

The condition explained is a dihybrid cross which involves two characters in a single plant.In the given cross, the parent pea plants are of two types:Tall plants with violet flowers

The condition explained is a dihybrid cross which involves two characters in a single plant.In the given cross, the parent pea plants are of two types:Tall plants with violet flowersShort plants with white flowers

The condition explained is a dihybrid cross which involves two characters in a single plant.In the given cross, the parent pea plants are of two types:Tall plants with violet flowersShort plants with white flowersSo, the genotype of the parents could be:

The condition explained is a dihybrid cross which involves two characters in a single plant.In the given cross, the parent pea plants are of two types:Tall plants with violet flowersShort plants with white flowersSo, the genotype of the parents could be:Tall plants with violet flowers: TTWW or TtWw

The condition explained is a dihybrid cross which involves two characters in a single plant.In the given cross, the parent pea plants are of two types:Tall plants with violet flowersShort plants with white flowersSo, the genotype of the parents could be:Tall plants with violet flowers: TTWW or TtWwShort plants with white flowers: ttww

The condition explained is a dihybrid cross which involves two characters in a single plant.In the given cross, the parent pea plants are of two types:Tall plants with violet flowersShort plants with white flowersSo, the genotype of the parents could be:Tall plants with violet flowers: TTWW or TtWwShort plants with white flowers: ttwwSince, all the progeny bore violet flowers, it implies that the tall plant with violet flowers has genotype ‘WW’ for violet flower colour.

The condition explained is a dihybrid cross which involves two characters in a single plant.In the given cross, the parent pea plants are of two types:Tall plants with violet flowersShort plants with white flowersSo, the genotype of the parents could be:Tall plants with violet flowers: TTWW or TtWwShort plants with white flowers: ttwwSince, all the progeny bore violet flowers, it implies that the tall plant with violet flowers has genotype ‘WW’ for violet flower colour.Since, the progeny obtained is both tall and short, the parent plant was not a pure tall plant and bears genes that determine short height of the plant. Therefore, the genotype of the plant with respect to height would be ‘Tt’.

The condition explained is a dihybrid cross which involves two characters in a single plant.In the given cross, the parent pea plants are of two types:Tall plants with violet flowersShort plants with white flowersSo, the genotype of the parents could be:Tall plants with violet flowers: TTWW or TtWwShort plants with white flowers: ttwwSince, all the progeny bore violet flowers, it implies that the tall plant with violet flowers has genotype ‘WW’ for violet flower colour.Since, the progeny obtained is both tall and short, the parent plant was not a pure tall plant and bears genes that determine short height of the plant. Therefore, the genotype of the plant with respect to height would be ‘Tt’.So, if a cross is carried out between tall parent with violet flowers (TtWW) and short parent with white flowers (ttww), the progeny obtained is TtWw (8):ttWw (4):ttWw(4).

The condition explained is a dihybrid cross which involves two characters in a single plant.In the given cross, the parent pea plants are of two types:Tall plants with violet flowersShort plants with white flowersSo, the genotype of the parents could be:Tall plants with violet flowers: TTWW or TtWwShort plants with white flowers: ttwwSince, all the progeny bore violet flowers, it implies that the tall plant with violet flowers has genotype ‘WW’ for violet flower colour.Since, the progeny obtained is both tall and short, the parent plant was not a pure tall plant and bears genes that determine short height of the plant. Therefore, the genotype of the plant with respect to height would be ‘Tt’.So, if a cross is carried out between tall parent with violet flowers (TtWW) and short parent with white flowers (ttww), the progeny obtained is TtWw (8):ttWw (4):ttWw(4).All the progeny bear violet flowers but half of them are tall and half are short.