Heredity and Variation — Important Questions
Maharashtra Board · Class 9 · Science
42 important questions from Heredity and Variation for Maharashtra Board Class 9 Science, with answers. Includes multiple choice, multiple correct.
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Important Questions from Heredity and Variation
Which of the following are components of DNA? (Select all correct answers)
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Adenine, Guanine, Cytosine, Thymine
DNA contains four nitrogenous bases: Adenine (A), Guanine (G), Cytosine (C), and Thymine (T). Uracil is found in RNA, not DNA.
Dominant genes are represented by ______ letters and recessive genes by ______ letters.
Down syndrome is caused by an extra chromosome in which pair?
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21st pair
Down syndrome is caused by trisomy of the 21st chromosome, meaning there are three copies of chromosome 21 instead of two.
Which type of reproduction shows greater variation in offspring?
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Sexual reproduction
Sexual reproduction produces greater variation because offspring receive genetic material from both parents, while asexual reproduction produces offspring identical to the parent.
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