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प्रश्न
Differentiate between Mendel’s monohybrid cross and dihybrid cross.
उत्तर
| Monohybrid Cross | Dihybrid Cross | |
| 1. | A cross between two pure organisms to study the inheritance of a single pair of contrasting characters. | A cross between two pure organisms to study the inheritance of two pairs of contrasting characters. |
| 2. | It produces a phenotypic monohybrid ratio of 3:1 in the F2 generation. | It produces a phenotypic dihybrid ratio of 9:3:3:1 in the F2 generation. |
| 3. | It produces a genotypic ratio of 1:2:1 in the F2 generation. | It produces a genotypic ratio of 1:2:1:2:4:2:1:2:1 in the F2 generation. |
| 4. | Example: Cross between tall and dwarf pea plants | Example: Cross of pea plants with round and yellow seeds and plants with wrinkled and green seeds |
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संबंधित प्रश्न
A pea plant pure for yellow seed colour is crossed with a pea plant pure for green seed colour. In the F1 generation all pea plants were with yellow seeds. Which law of Mendel is applicable?
The F2 progeny of a monohybrid cross showed phenotypic and genotypic ratio as 1:2:1 unlike that the Mendel’s monohybrid F2 ratio. With the help of a suitable example, work out a cross and explain how it is possible.
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.
Describe quantitative inheritance controlled by two pairs of genes.
Explain the law of independent assortment with a suitable example.
In Mendel’s experiments, tall pea plants (T) are dominant over dwarf pea plants (t).
What is the phenotypic ratio and genotypic ratio of the above cross in (ii)?
Choose the correct answer:
Mendel conducted his hybridization experiments on _______
Choose the correct answer:
Father of genetics ________
Answer the following question.
Compare in any three ways the chromosomal theory of inheritance as proposed by Sutton and Bovery with that of experimental results on pea plant presented by Mendel.
Define Mendel’s law of segregation.
The crossing of F1 to homozygous recessive parent is called ______.
The test cross is used to determine the ______.
First geneticist/father of genetics was ______.
______ pairs of contrasting traits were studied by Mendel in pea plant.
Which of the following characters was not chosen by Mendel?
Mendel’s law of independent assortment does not hold true for the genes that are located closely on ______.
Read the following and answer from given below:
Prashant wanted to find the genotype of a pea plant bearing purple coloured flowers in his kitchen garden. For this, he crossed purple-flowered plants with white-flowered plants. As a result, all plants which were produced had purple flowers only. Upon selfing these plants, 75 purple flower plants and 25 white flowers plants were produced. Now, he can determine the genotype of a purple-flowered plant by crossing it with a white-flowered plant.
In white-flowered plants, the allele is expressed in ______
Read the following and answer from given below:
According to Mendel, one gene controls the expression of one character only. The ability of a gene to have multiple phenotypic effects because it influences a number of characters are an exception. The gene has multiple phenotypic effects because its ability to control two or more characters can be seen in cotton. In cotton, a gene for the lint also influences the height of the plant, size of the ball, number of ovules, and viability of seeds.
Which of the following statements is not correct regarding genes with multiple phenotypic effects?
In his cleric experiments on pea plants, Mendel did not use:
At which stage, did Mendel observe the segregation of alleles in garden pea plants?
