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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, both chromosomes and genes segregate and assort independently before recombining in the zygote during fertilisation. Morgan, Sturtevant, and Bridges enlarged upon the chromosomal theory of inheritance.
संबंधित प्रश्न
If centromere is situated in the middle of the chromosome, it is called ________.
(a) Metacentric
(b) Acrocentric
(c) Submetacentric
(d) Telocentric
Sketch and label the structure of chromosome.
Distinguish between X andY chromosomes. (Mention any 'two' points.)
Explain the types of chromosomes on the basis of position of centromere.
Classify the chromosomes on the basis of position of centromere.
Describe the structure of sex-chromosomes.
Define the Homologous chromosomes
Explain codominance in colour coat in cattle with checker board method.
An allohexaploidy contains
The A and B genes are 10 cm apart on a chromosome. If an AB/ab heterozygote is test crossed to ab/ab, how many of each progeny class would you expect out of 100 total progeny?
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
Mention the name of man-made cereal. How it is formed?
Match the column I (Type of chromosome) with column II (name of chromosome).
| Type of chromosome | Name of chromosome | ||
| i. |  |
P. | Acrocentric |
| ii. |  |
Q. | Telocentric |
| iii. |  |
R. | Metacentric |
| iv. |  |
S. | Sub-metacentric |
During cell division, spindle fibres get attached to the disc shaped structures present on the centromere are known as ______.
From the following identify the statements that are CORRECT with respect to homologous and non-homologous region of X and Y chromosomes.
i. Non-homologous region of X chromosome is longer and contains more genes than that of non-homologous region of Y chromosome.
ii. X-linked genes are present on nonhomologous region of X-chromosome.
iii. Y-linked genes are present on homologous region of Y-chromosome.
iv. Crossing over occurs only between homologous regions of X and Y chromosomes.
At secondary constriction I, ______ becomes organized during interphase.
Chromosomal theory of inheritance was put forth by ______
Which of the following does NOT agree with chrotnosomal theory of inheritance?
A plant having the genotype AABbCC will produce ______ kinds of gametes.
Extranuclear inheritance occurs in ______.
Extra nuclear chromosomes occur in ______.
Which three scientists independently rediscovered Mendel’s work?
Experimental verification of ‘chromosomal theory of inheritance’ was done by ______.
Which of the following statements indicates parallelism in genes and chromosomes?
- They occur in pairs.
- They segregate during gamete formation.
- They show linkage.
- Independent pairs segregate independently.
What do you mean by locus?
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
In a karyotype analysis, X and Y chromosomes represent sex chromosomes.
Name the scientist who discovered the X chromosome.
