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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

What is the reason for the 21st trisomy? - Biology

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प्रश्न

What is the reason for the 21st trisomy?

एका वाक्यात उत्तर

उत्तर

21st Trisomy occurs due to non-disjunction or failure of separation of chromosomes (autosomes) during gamete formation.

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पाठ 3: Inheritance and Variation - Very Short Answer

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

(a) Why are thalassemia and haemophilia categorized as Mendelian disorders? Write the symptoms of these diseases. Explain their pattern of inheritance in humans.

(b) Write the genotypes of the normal parents producing a haemophilic son.


Given below is the representation of amino acid composition not the relevant translated portion of β-chain of haemoglobin, related to the shape of human red blood cells

(a) Is this representation indicating a normal human or a sufferer from certain related genetic disease? Give reason in support of your answer.

(b) What difference would be noticed in the phenotype of the normal and the sufferer related to this gene?

(c) Who are likely to suffer more from the defect related to the gene represented the males, the females or both males and females equally? And why?


Name the disorder caused by under secretion of thyroxine in children


About 8% of the human male population suffers from colour blindness, whereas only about 0.4% of the human female population suffers from this disease. Write an explanation to show how it is possible.


Give the importance of heterocyst in cyanobateria.


Answer the following question.
Both Haemophilia and Thalessemia are blood-related disorders in humans. Write their causes and the difference between the two. Name the category of genetic disorder they both come under.


If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is ______.


Mental retardation in man associated with sex chromosomal abnormality is usually due to ______.


Trisomy is represented by ______.


Select the correct match.


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