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प्रश्न
Write an account of the chromosomal theory of inheritance.
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उत्तर
Chromosomal theory of inheritance was proposed by Sutton and Boveri. Following are the postulates of the chromosomal theory of inheritance:
- Chromosomes are found in pairs in somatic or diploid cells.
- During gamete formation, homologous chromosomes pair, segregate and assort independently at meiosis. Due to this, each gamete contains only one chromosome of a pair.
- Hereditary characters are carried by chromosomes which are present in the nucleus of these gametes.
- Gametes (sperm and egg) contain all the hereditary characters. They form the link between parents and offsprings.
- The union of sperm and egg during fertilization restores the diploid number of chromosomes.
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संबंधित प्रश्न
Why the ratio in pleiotropy is 2 : 1? Explain it with an example.
In Mendelian monohybrid cross, phenotypic ratio in F2 is 3: 1. Find out the types of gametes formed by F1 generation.
______ is an example of pleiotropy.
In cattle, when red one is crossed with a white, an intermediate roan coloured offspring is formed in the F1 generation. When selfing of the F1 generation was carried, the result obtained was ______
Assertion (A): In Mirabilis jalapa (4 o'clock plant), a cross between Red flowered plant and White-flowered plant (both homozygous) produced Pink flowered plant in F1 generation.
Reason (R): In this plant, flower colour is controlled by pleiotropic genes
______ represents the genotype of a carrier carrying a gene for sickle-cell anaemia.
In which of the following, are the genotypic and phenotypic ratios are same?
Which idea is depicted by a cross in which the F1 generation resembles both the parents?
A pea plant homozygous for yellow round seed is crossed with its recessive parents. Calculate the phenotypic and genotypic ratio with the help of a checkerboard.
Which one of the following is an EXCEPTION to the generalization made by Mendel on the basis of his experiments on garden pea plant?
