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प्रश्न
Write an account of the chromosomal theory of inheritance.
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
Short Answer Question.
Write a note on pleiotropy.
The genotypes of a husband and wife are IAIB and IAi respectively. How many different genotypes and phenotypes are possible among the blood types of their children?
In ____________, one could get same genotypic and phenotypic ratio.
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
____________ is the genotypic and phenotypic ratio in incomplete dominance.
The number of phenotypic and genotypic individuals produced during a typical Mendelian monohybrid cross will be ______ and ______ respectively.
Which one of the following is NOT a characteristic of garden pea plants?
Which one of the following statements is correct?
A gene which causes death of its bearer is ______.
Explain the law of dominance and compare how it differs from incomplete dominance and co-dominance.
