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प्रश्न
Who had proposed the chromosomal theory of inheritance?
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उत्तर
Sutton and Boveri independently proposed the chromosomal theory of inheritance in 1902. The two workers found a distinctive connection between the transmission of Mendelian hereditary elements (genes) and chromosome activity during gamete production and fertilisation. They proposed that chromosomes carried Mendelian factors. During meiosis, the chromosome, not the genes, segregates and assorts independently before recombining in the zygote during fertilisation. Morgan, Sturtevant, and Bridges enlarged upon the chromosomal theory of inheritance.
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संबंधित प्रश्न
If centromere is situated in the middle of the chromosome, it is called ________.
(a) Metacentric
(b) Acrocentric
(c) Submetacentric
(d) Telocentric
A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason.
Distinguish between X andY chromosomes. (Mention any 'two' points.)
Name the type of cell division involved in the production of sperms by honey bees.
Describe the structure of chromosomes with a suitable diagram.
Genes G S L H are located on the same chromosome. The recombination percentage is between L and G is 15%, S and L is 50%, H and S are 20%. The correct order of genes is
Changing the codon AGC to AGA represents
Write the salient features of the Sutton and Boveri concept.
When two different genes came from the same parent they tend to remain together.
Write the observed phenotypic ratio.
Which of the following is a primary constriction?
From the following identify the INCORRECT statement/s with respect to the chromosomes.
i. Chromosomes are capable of self replication and play vital role in heredity, mutation, variation, and evolutionary development of eukaryotic species.
ii. Chromosomes are visible during cell division.
iii. Chemically eukaryotic chromosomes are made of mRNA, histone and non-histone proteins.
iv. The number of chromosomes varies within the population of a particular species.
At secondary constriction I, ______ becomes organized during interphase.
Which of the following does NOT agree with chrotnosomal theory of inheritance?
Mendel’s work was rediscovered by three scientists in the year ______.
Which three scientists independently rediscovered Mendel’s work?
Chromosomal theory of inheritance was given by ______.
Experimental verification of ‘chromosomal theory of inheritance’ was done by ______.
Chromosome maps/genetic maps were first prepared by ______.
A couple has two daughters. What is the probability that the third child will also be a female?
What are minisatellites?
Which of the following phase follows S and G2 phases of interphase?
Discuss in detail the contributions of Morgan and Sturvant in the area of genetics.
Which of the following sentences are correct?
1. The offspring exhibit only parental combinations due to incomplete linkage
2. The linked genes exhibit some crossing over in complete linkage
3. The separation of two linked genes are possible in incomplete linkage
4. Crossing over is absent in complete linkage
