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प्रश्न
In peas, tallness is dominant over dwarfness, and red colour of flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated with a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny in numbers mentioned against them:
Tall, Red = 138
Tall, White = 132
Dwarf, Red = 136
Dwarf, White = 128
Mention the genotypes of the two parents and of the four offspring types.
उत्तर
The result shows that the four types of offspring are in a ratio of 1:1:1:1. Such a result is observed in a test-cross progeny of a dihybrid cross.
The cross can be represented as:
Tall and Red (Tt Rr) × Dwarf and white (ttrr)
|
off springs |
tr | |||
|
Tt Rr – Tall, Red Tt rr – Tall, White Tt Rr – dwarf, red tt rr – dwarf, white |
TR | TtRr | Tall | Red |
| Tr | Ttrr | Tall | White | |
| tR | ttRr | dwarf | Red | |
| tr | ttrr | dwarf | white | |
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संबंधित प्रश्न
Using a Punnett square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.
The 9 : 3 : 3 : 1 dihybrid ratio is due to ______.
Explain the following term : Homozygous
Explain Mendel’s Monohybrid cross. Give an example.
Give Technical Term:
The hereditary unit, which is responsible for inheritance.
Why law of segregation is also called the law of purity of gametes?
Which one of the following characters studied by Mendel in garden pea was found to be dominant?
Genes which code for a pair of contrasting traits are known as ______.
When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both its parents. This phenomenon is called?
In order to obtain the F1 generation Mendel pollinated a pure-breeding tall plant with a pure breeding dwarf plant. But for getting the F2 generation, he simply self-pollinated the tall F1 plants. Why?
