कृषि, पशु र वन विज्ञान B.Sc. Ag र B.V.Sc. & A.H. प्रवेश तयारी
कृषि, पशु र वन विज्ञान – B.Sc. Ag र B.V.Sc. & A.H. प्रवेश
B.Sc. Ag & B.V.Sc. Entrance · Agriculture, Veterinary & Forestry Entrance
२,४९३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कृषि, पशु र वन विज्ञान प्रवेश: 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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Cystic fibrosis, which causes thick mucus in the lungs, is inherited as a/an:
सही उत्तर: क) Autosomal recessive trait
Cystic fibrosis results from mutations in the CFTR gene on chromosome 7 and appears only when both alleles are defective.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A newborn with trisomy 13 who has cleft lip and palate, extra fingers and severe heart and brain defects is suffering from:
सही उत्तर: ख) Patau's syndrome
Trisomy 13 causes Patau's syndrome; Edwards' syndrome is trisomy 18 and Down's syndrome trisomy 21.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Criss-cross inheritance, in which a trait passes from a father through his daughter to his grandson, is characteristic of:
सही उत्तर: क) X-linked recessive genes
An affected father gives his X to his daughter (a carrier), who passes it to her son; this zig-zag pattern is typical of X-linked recessive traits.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hypertrichosis of the ear (hairy pinna), passed only from father to son, is an example of:
सही उत्तर: ख) Y-linked (holandric) inheritance
Genes on the non-homologous part of the Y chromosome are holandric: they are passed only from father to all sons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A woman who is a carrier of haemophilia marries a normal man. What is the probability that any son of theirs will be haemophilic?
सही उत्तर: क) 1/2
Sons receive their X from the mother; the carrier mother (XᴴXʰ) passes Xʰ to half of her sons, so each son has a 1/2 chance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Both parents are normally pigmented but are carriers (heterozygous) of the recessive allele for albinism. What is the probability that their child will be albino?
सही उत्तर: घ) 1/4
Aa × Aa gives AA : Aa : aa in the ratio 1 : 2 : 1, so the chance of an aa (albino) child is 1/4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the F2 generation of a Mendelian dihybrid cross (AaBb × AaBb), how many different genotypes are produced?
सही उत्तर: ख) 9
Each gene gives 3 genotypes (AA, Aa, aa), so the dihybrid F2 has 3 × 3 = 9 genotypes, though only 4 phenotypes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How many different types of gametes can be produced by an individual of genotype AaBbCc (genes assorting independently)?
सही उत्तर: ग) 8
Number of gamete types = 2^n where n is the number of heterozygous gene pairs; 2^3 = 8.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The F2 ratio of 15 : 1, as seen in the shape of the seed capsule of shepherd's purse (Capsella), is due to:
सही उत्तर: क) Duplicate dominant genes
With duplicate genes, a dominant allele of either gene gives the same phenotype, so only the double recessive (1/16) differs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 12 : 3 : 1 phenotypic ratio in the F2 of a dihybrid cross, as for fruit colour in summer squash, indicates:
सही उत्तर: ग) Dominant epistasis
In dominant epistasis one dominant allele masks the other gene, merging two classes of the 9 : 3 : 3 : 1 ratio into 12.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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