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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
Write a note on multiple alleles considering examples of human blood groups.
Which genes show straight inheritance?
Explain intragenic and intergenic interaction with the help of example.
If two individuals with blood group 'AB' marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group: 'B' blood group in 1 : 2 : 1 ratio. Modem technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of ______.
____________ 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?
F2 generation in Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents a case of ______.
Give a cross of co-dominance using a suitable example.
