जीव विज्ञान – Biology MCQ
जीव विज्ञान – कृषि/वन प्रवेश
Biology · Agriculture, Veterinary & Forestry Entrance · ८४० प्रश्न
८४० प्रश्न उपलब्ध। मोड छान्नुहोस्:
जीव विज्ञान: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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In the Hardy-Weinberg equilibrium, if the frequency of the recessive allele q = 0.3, what is the frequency of heterozygotes?
सही उत्तर: घ) 0.42
p = 1 - 0.3 = 0.7; heterozygote frequency = 2pq = 2 × 0.7 × 0.3 = 0.42.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The mutation theory of evolution was proposed by Hugo de Vries based on his studies of:
सही उत्तर: क) Oenothera lamarckiana
De Vries observed sudden heritable changes in the evening primrose, Oenothera lamarckiana.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Wings of a butterfly and wings of a bird are:
सही उत्तर: ग) Analogous organs
They perform the same function but have different origin and structure, which indicates convergent evolution.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The forelimbs of a whale, a bat and a human are examples of:
सही उत्तर: घ) Homologous organs
They share the same basic structure and origin but perform different functions, so they are homologous (divergent evolution).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Human skin colour, controlled by several genes with additive effect, is an example of:
सही उत्तर: ग) Polygenic inheritance
Skin colour is controlled by three or more gene pairs with cumulative effect, i.e. polygenic (quantitative) inheritance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The term 'gene' was coined by:
सही उत्तर: ख) Wilhelm Johannsen
Johannsen coined 'gene' in 1909; Bateson coined 'genetics', and Mendel called them 'factors'.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sickle cell anaemia results from substitution of glutamic acid by which amino acid at the sixth position of the β-globin chain?
सही उत्तर: क) Valine
A point mutation (GAG to GUG) replaces glutamic acid with valine in the β chain of haemoglobin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The karyotype of an individual with Turner's syndrome is:
सही उत्तर: क) 45, XO
Turner's syndrome females lack one X chromosome (44 + XO); 47, XXY is Klinefelter's syndrome.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Down's syndrome is caused by trisomy of chromosome:
सही उत्तर: ख) 21
Down's syndrome results from an extra copy of chromosome 21 (47 chromosomes).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A colour-blind man marries a woman with normal vision who is not a carrier. What proportion of their sons will be colour blind?
सही उत्तर: ख) 0%
Sons get their X chromosome from the mother, who has only normal alleles, so no son will be colour blind (daughters will be carriers).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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