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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

How was it concluded that genes are located on chromosomes? - Biology

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प्रश्न

How was it concluded that genes are located on chromosomes?

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उत्तर

Walter Sutton and Theodor Boveri studied the behaviour of chromosomes and genes during meiosis. They observed that the movement of the chromosome and that of the gene was similar. Based on this observation, thy proposed that genes are located on chromosomes.

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अध्याय 5: Principle of Inheritance and Variation - SHORT ANSWER [पृष्ठ ३४]

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एनसीईआरटी एक्झांप्लर Biology [English] Class 12
अध्याय 5 Principle of Inheritance and Variation
SHORT ANSWER | Q 4. | पृष्ठ ३४

संबंधित प्रश्न

Pataus’ syndrome is also referred to as ____________.


Which of the following is not correct?


While trying to find out the characteristic of a newly found animal, a researcher did the histology of adult animal and observed a cavity with presence of mesodermal tissue towards the body wall but no mesodermal tissue was observed towards the alimentary canal. What could be the possible coelom of that animal?


Match List - I with List - IІ.

List - I List - II
A. Head I. Enzymes
B. Middle piece II. Sperm motility
C. Acrosome ΙII. Energy
D. Tail IV. Genetic material

Choose the correct answer from the options given below:


Which of following organisms cannot fix nitrogen?

  1. Azotobacter
  2. Oscillatoria
  3. Anabaena
  4. Volvoх
  5. Nostoc

Choose the correct answer from the options given below:


Name the class of enzyme that usually catalyse the following reaction:

S − G + S# → S + S# G

where, G → a group other than hydrogen

S → a substrate

S# → another substrate


The correct sequence of events in the life cycle of bryophytes is:

  1. Fusion of antherozoid with egg.
  2. Attachment of gametophyte to substratum.
  3. Reduction division to produce haploid spores.
  4. Formation of sporophyte.
  5. Release of antherozoids into water.

Choose the correct answer from the option given below:


Match List - I with List - II.

List - I List - II
A. Centromere I. Mitochondrion
B. Cilium II. Cell division
C. Cristae III. Сell movement
D. Cell membrane IV. Phospholipid Bilayer

Choose the correct answer from the options given below:


Match List - I with List - II.

List - I List - II
A. Chlorophyll a I. Yellow-green
B. Chlorophyll b II. Yellow
C. Xanthophylls III. Blue-green
D. Carotenoids IV. Yellow to Yellow-orange

Choose the option with all correct matches.


Find the correct statements:

  1. In human pregnancy, the major organ systems are formed at the end of 12 weeks.
  2. In human pregnancy, the major organ systems are formed at the end of 8 weeks.
  3. In human pregnancy, heart is formed after one month of gestation.
  4. In human pregnancy, limbs and digits develop by the end of second month.
  5. In human pregnancy, the appearance of hair usually observed in the fifth month.

Choose the correct answer from the options given below:


In the seeds of cereals, the outer covering of endosperm separates the embryo by a protein-rich layer called ______.


Assertion (A): A typical unfertilised, angiosperm embryo sac at maturity is 8 nucleate and 7-celled.

Reason (R): The egg apparatus has 2 polar nuclei. In the light of the above statements, choose the correct answer from the options given below:

In the light of the above statements, choose the correct answer from the options given below:


What is the pattern of inheritance for polygenic trait?


Which one of the following enzymes contains ‘Haem’ as the prosthetic group?


Who is known as the Father of Ecology in India?


All living members of the class Cyclostomata are ______.


Match List - I with List - IІ.

List - I List - IІ
A. Scutellum I. Persistent nucellus
B. Non-albuminous seed II. Cotyledon of Monocot seed
C. Epiblast III. Groundnut
D. Perisperm IV. Rudimentary cotyledon

Choose the option with all correct matches.


Assertion (A): All vertebrates are chordates but all chordates are not vertebrate.

Reason (R): The members of subphylum vertebrata possess notochord, during the embryonic period, the notochord is replaced by a cartilaginous or bony vertebral column in adults.

In the light of the above statements, choose the correct answer from the options given below:


Match List I with List II.

  List I   List II
A. Down’s syndrome I. 11th chromosome
B. α-Thalassemia II. ‘X’ chromosome
C. β-Thalassemia III. 21st chromosome
D. Klinefelter’s syndrome IV. 16th chromosome

Choose the correct answer from the options given below:


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