Biology
Genetics and Plant Breeding
1,240 Questions
Genetics and Plant Breeding explores the principles of heredity, chromosomal inheritance, and hybridization techniques. It includes key concepts like Mendelian genetics, gene linkage, and polygenic inheritance. This topic is essential for students tackling advanced biology or botany sections in competitive examinations.
Mendelian InheritanceChromosome TheoryGene LinkagePolygenic InheritancePlant HybridizationPopulation Genetics Equilibrium
Genetics and Plant Breeding Questions
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1 : 2
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1 : 2 : 1
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3 : 1
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1 : 1
B
Correct answer
Explanation
Random union of equal numbers of R and r gametes produced an F2 generation with 25% RR and 50% Rr and 25% rr.
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test cross
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back cross
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monohybrid cross
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dihybrid (or trihybrid) cross
D
Correct answer
Explanation
Law of independent assortment can be explained with the help of (or proved by) dihybrid (or trihybrid) cross.
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All sons will be colour-blind
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All daughters will be colour-blind
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All sons and daughters will be normal, but all daughters will be carrier
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All sons and daughters will be colour-blind
C
Correct answer
Explanation
If a colour-blind man is married to a normal woman all sons and daughters will be normal, but all daughters will be carrier.
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reciprocal
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back cross
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test cross
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monohybrid
C
Correct answer
Explanation
When F1 hybrid is crossed with one of the two parents form whcih they were derived than such a cross is called back cross. The cross of F1 hybrid to the recessive parent is used to ascertain whether a dominant is homozygous or heterozygous and it is called test cross.
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Fused
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Hairy
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Even skipped
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Antennapedia
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Hunchback
E
Correct answer
Explanation
Hunchback is a Gap gene in Drosophila.
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In defining polarity to the egg.
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Roughly subdivides the embryo along the anterior/posterior axis.
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Divides the embryo into pairs of segments.
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It sets the anterior/posterior axis of each segment.
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Involved in the formation of legs.
A
Correct answer
Explanation
Maternal genes establish gradients from anterior and posterior poles.
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Knirps
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Giant
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Hunchback
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Knirp and giand
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Knirp and hunch back
D
Correct answer
Explanation
Knirp and giand are the two gap genes expressed posterior pole of drosophilla egg.
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inducing mutations
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bombarding the protoplast with DNA
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the crossing of two inbred parental lines
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harvesting seeds from the productive plants
C
Correct answer
Explanation
In maize, hybrid vigour is exploited by crossing of two inbred parental lines. Heterosis, hybrid vigour or outbreeding enhancement is the improved or increased function of any biological quality in a hybrid offspring.
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its economic importance
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presence of contrasting characters in it
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its easy availability
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its cheapness
B
Correct answer
Explanation
Gregor Mendel chose pea plants for his experiments because they are easy to raise, have many offspring per mating, can fertilize themselves and have varieties in genotype and phenotype that are easily observable. These characteristics make pea plants ideal in the study of genetics and heredity.
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A or B
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O
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AB
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Any of the above
D
Correct answer
Explanation
Parents belong to blood group A and B. Blood group of their child can be A, B, O or AB.
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By crossing brown Swiss and Sahiwal variety
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By crossing Friesian and Sahiwal variety
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By crossing Holstein and Jersey variety
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By crossing brown Swiss and Re Sindhi variety
B
Correct answer
Explanation
Frieswal Cow (the high milk yielding crossbred) produced by crossing Friesian and Sahiwal variety.
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test cross
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reciprocal cross
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monohybrid cross
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back cross
D
Correct answer
Explanation
The correct answer is option (4).
A
Correct answer
Explanation
The correct answer is option (1).