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56. Mendel crossed tall plant with dwarf plant in his famous experiment on Pisum sativum. In the first generation, got only tall plants. Because (NTSE Tamil Nadu, Stage-I, 2016-17)
The parental plants were heterogenous to their characters
The soil was fertile
The parental plants were pure to their character
The tallness character was a recessive character
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57. Colour-blindness is more common in men than in women due to (NTSE Karnataka, Stage-I, 2016-17)
Dominant genes of such traits are found on 'Y'chromosome
Dominant genes of such traits are found on 'X'chromosome
Recessive genes of such traits which occur on the 'X' chromosome
Recessive genes of such traits which occur on the 'Y' chromosome
58. A pea plant with yellow and round seeds (VYRR) is crossed with a pea plant having green and wrinkled (yyrr) seeds then in F 2 generation of this dihybrid cross 320 plants are produced. Out of which 180 plants have same phenotypic characters. Identify this phenotype. (NTSE Maharashtra, Stage-I, 2016-17)
Yellow and wrinkled seeds
Yellow and round seeds
Green and round seeds
Green and wrinkled seeds
59. The offsprings formed as a result of sexual reproduction exhibit more variations because (NTSE Haryana, Stage-I, 2016-17)
Sexual reproduction is lengthy process
Genetic material comes from two parents of different species
Genetic material comes from two parents of same species
Genetic material comes from many parents
60. The sex of a male child is determined by which of the following? (NTSE Haryana, Stage-I, 2016-17)
The length of the mother's pregnancy
The length of time between ovulation and copulation
The presence of an X chromosome
The presence of a Y chromosome
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