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

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

संबंधित प्रश्‍न

Mention the symptoms of Down syndrome.


What is Down’s syndrome? Give its symptoms and cause. Why is it that the chances of having a child with Down’s syndrome increases if the age of the mother exceeds forty years?


Define aneuploidy. How is it different from polyploidy? Describe the individuals having following chromosomal abnormalities.

  1. Trisomy of 21st Chromosome
  2. XXY
  3. XO

Streptokinase produced by bacterium Streptococcus is used for ______.


Which chromosome in the human genome has the highest number of genes?


Which of the following statement is correct about location of the male frog copulatory pad?


Which are correct:

  1. Computed tomography and magnetic resonance imaging detect cancers of internal organs.
  2. Chemotherapeutics drugs are used to kill noncancerous cells.
  3. α-interferon activate the cancer patients' immune system and helps in destroying the tumour.
  4. Chemotherapeutic drugs are biological response modifiers.
  5. In the case of leukaemia blood cells counts are decreased.

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

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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:


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:


A specialised membranous structure in a prokaryotic cell which helps in cell wall formation, DNA replication and respiration is ______.


Which of the following are the post-transcriptional events in an eukaryotic cell?

  1. Transport of pre-mRNA to cytoplasm prior to splicing.
  2. Removal of introns and joining of exons.
  3. Addition of methyl group at 5' end of hnRNA.
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  5. Base pairing of two complementary RNAs.

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Who is known as the Father of Ecology in India?


Neoplastic characteristics of cells refer to:

  1. A mass of proliferating cell.
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Choose the correct answer from the options given below:


Match List - I with List - IІ.

List - I List - IІ
A. Scutellum I. Persistent nucellus
B. Non-albuminous seed II. Cotyledon of Monocot seed
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Match List I with List II.

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

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