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प्रश्न
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उत्तर
In a dihybrid cross , two pairs of alleles or contrasting characters are considered in parents.
For example, cotyledon colour and seed shape of pea are used as two pairs of alleles.
Suppose, among the two parents, one was true breeding dominant i.e. yellow coloured cotyledons and round seeds, YYRR and the other was a true breeding recessive i.e. green coloured cotyledons and wrinkled seeds, yyrr. On crossing the two parents, F1 generation so obtained had all yellow and round seeds.
On self pollinating, the hybrids - YyRr produced four types of seeds in F2 generation:
(i) Yellow cotyledons and round seeds (YYRR)
(ii) Yellow cotyledons and wrinkled seeds (YYrr)
(iii) Green cotyledons and round seeds (yyRR)
(iv) Green cotyledons and wrinkled seeds (yyrr)
Thus the phenotypic ratio of a dihybrid cross is 9:3:3:1.
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संबंधित प्रश्न
Give Technical Term:
The ratio of offspring on F2 generation in a dihybrid cross.
Which Mendelian idea is depicted by a cross in which the F1 generation resembles both the parents
Among the following characters which one was not considered by Mendel in his experimentation pea?
A normal green male maize is crossed with albino female. The progeny is albino because ______.
Two genes ‘A’ and ‘B’ are linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?
In the F2 generation of a Mendelian dihybrid cross the number of phenotypes and genotypes are ______.
Each gamete carry ______.
Assertion: When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than the nonparental type.
Reason: Higher parental gene combinations can be attributed to crossing over between two genes.
What is the difference between genetic drift and change due to natural selection?
Sahil performed an experiment to study the inheritance pattern of genes. He crossed tall pea plants (TT) with short pea plants (tt) and obtained all tall plants in F1 generation.
When F1 plants were cross-pollinated with plants having tt genes, a total of 800 plants were produced. How many of these would be tall, medium height or short plants? Give the genotype of F2 generation.
