Principles of Inheritance & Variation PYQs Set 5 (PDF)

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Set 5 of 5 · Questions 121-129 of 129

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Mere Teacher · Previous Year Questions NEET Biology · Principles of Inheritance & Variation · Set 5 (Q121-129)
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121. $A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F_{1} plants were sealed the resulting genotypes were in the ratio of:$ (1) $1:2:1: Tall homozygous: Tall heterozygous : Dwarf$ (2) $1:2:1: Tall heterozygous: Tall homozygous: Dwarf$ (3) $3 : 1 : : Tall Dwarf$ (4) $3 : 1 : : Dwarf : Tall$ 122. $Which of the following conditions of the zygotic cell would lead to the birth of a normal human male child?$ (1) $Two X-chromosomes$ (2) $Only one Y-chromosome$ (3) $Only one X-chromosome$ (4) $One X-and one Y-chromosome$ 123. $Which one of the following conditions correctly describes the manner of determining the sex in the given example?$ (1) $XO type of sex chromosomes determine male sex in grasshopper.$ (2) $XO condition in humans as found in Turner syndrome, determines female sex.$ (3) $Homozygous sex chromosomes (XX) produce male in Drosophila.$ (4) $Homozygous sex chromosomes (ZZ) determine female sex in birds.$ 124. $Inheritance of skin colour in humans is an example of :-$ (1) $chromosomal aberration$ (2) $point mutation$ (3) $polygenic inheritance$ (4) $codominance$ 125. $Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?$ (1) $Two X chromosomes$ (2) $Only one Y chromosome$ (3) $Only one X chromosome$ (4) $One X and one Y chromosome$ 126. $Test cross in plants or in Drosophila involves crossing:$ (1) $Between two genotypes with dominant trait$ (2) $Between two genotypes with recessive trait$ (3) $Between two F_{1} hybrids$ (4) $The F_{1} hybrid with a double recessive genotype$ 127. $Select the incorrect statement from the following:-$ (1) $Baldness is a sex-limited trait$ (2) $Linkage is an exception to the principle of independent assortment in heredity$ (3) $Galactosemia is an inborn error of metabolism$ (4) $Small population size results in random genetic drift in a population$ 128. $Phenotype of an organism is the result of -$ (1) $Mutations and linkages$ (2) $Cytoplasmic effects and nutrition$ (3) $Environmental changes and sexual dimorphism$ (4) $Genotype and environment interactions$ 129. $Test cross involves -$ (1) $Crossing between two genotypes with recessive trait$ (2) $Crossing between two F_{1} hybrids$ (3) $Crossing the F_{1} hybrid with a double recessive genotype$ (4) $Crossing between two genotypes with dominant trait$