Sex Determination & Sex-linked Inheritance
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Question No. 1 Marks +1 -0 Time
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Which of the following describes the sex determination system in humans, where males are heterogametic and females are homogametic?
Question No. 2 Marks +1 -0 Time
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The SRY gene, located on the Y chromosome, is crucial for:
Question No. 3 Marks +1 -0 Time
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A Barr body is an inactivated X chromosome found in the somatic cells of which individuals?
Question No. 4 Marks +1 -0 Time
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Which of the following is an example of an X-linked recessive disorder?
Question No. 5 Marks +1 -0 Time
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In Drosophila melanogaster (fruit flies), sex is determined by the ratio of X chromosomes to sets of autosomes. This is an example of:
Question No. 6 Marks +1 -0 Time
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If a male with an X-linked recessive disorder (e.g., color blindness) marries a homozygous dominant female (normal vision), what is the probability that their sons will inherit the disorder?
Question No. 7 Marks +1 -0 Time
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Which type of inheritance pattern is characterized by the trait being passed from father to all his sons, but never to his daughters?
Question No. 8 Marks +1 -0 Time
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In birds, the sex chromosomes are designated Z and W. Which of the following genotypes represents a female bird?
Question No. 9 Marks +1 -0 Time
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The phenomenon of dosage compensation in mammals ensures that:
Question No. 10 Marks +1 -0 Time
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A woman is a carrier for an X-linked recessive disorder. She marries a man who does not have the disorder. What is the probability that their daughter will be a carrier?
Question No. 11 Marks +1 -0 Time
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Which of the following conditions is an example of aneuploidy of sex chromosomes?
Question No. 12 Marks +1 -0 Time
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In some species of reptiles, such as crocodiles and turtles, the sex of offspring is determined by the incubation temperature of the eggs. This is known as:
Question No. 13 Marks +1 -0 Time
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A pedigree shows a trait that appears in every generation, affects males and females equally, and affected fathers can pass it to all their daughters but not to their sons. This pattern suggests:
Question No. 14 Marks +1 -0 Time
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Which of the following statements about Y-linked genes is TRUE?
Question No. 15 Marks +1 -0 Time
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If a mother is a carrier for an X-linked recessive trait and the father is unaffected, what is the probability that their son will express the trait?
Question No. 16 Marks +1 -0 Time
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The term 'karyotype' refers to:
Question No. 17 Marks +1 -0 Time
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Which of the following is NOT a characteristic of X-linked recessive inheritance?
Question No. 18 Marks +1 -0 Time
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In the haplodiploidy system of sex determination, commonly found in bees, ants, and wasps:
Question No. 19 Marks +1 -0 Time
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The gene responsible for Duchenne Muscular Dystrophy (DMD) is located on the X chromosome. This means DMD is an example of:
Question No. 20 Marks +1 -0 Time
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Match the following terms related to sex determination and inheritance:

TermDescription
1. Klinefelter Syndromea. XO genotype
2. Barr Bodyb. XXY genotype
3. Turner Syndromec. Inactivated X chromosome

Choose the correct combination:
Question No. 21 Marks +1 -0 Time
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Which sex chromosome is generally smaller and carries fewer genes?
Question No. 22 Marks +1 -0 Time
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A woman has normal vision, but her father was colorblind. She marries a man with normal vision. What is the probability that their son will be colorblind?
Question No. 23 Marks +1 -0 Time
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In humans, the presence of which specific chromosome leads to the development of male characteristics, primarily through the action of the SRY gene?
Question No. 24 Marks +1 -0 Time
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Which of the following is true regarding X-linked dominant inheritance?
Question No. 25 Marks +1 -0 Time
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Consider a genetic condition where males are more severely affected than females, and affected individuals often have unaffected parents. This pattern is characteristic of:

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