SEX DETERMINATION 09 HEREDITY AND EVOLUTION Class 10th Biology (Practice Sheet) 1 What is sex determination? A. The process of choosing one's gender identity. B. The process of determining the sex of an individual based on genetic composition. C. The process of sexual reproduction in organisms. D. The process of hormonal changes during puberty. 2 How many pairs of chromosomes are there in humans? A. 20 B. 22 C. 23 D. 24 3 What is the role of the Y chromosome in sex determination? A. Determines the eye color. B. Determines height. C. Determines the sex of an individual. D. Determines blood type. 4 In humans, what is the sex chromosome composition for females? A. XY B. XX C. YY D. X 5 Which sex-determination system is found in humans, mammals, some insects, and a few plant species? A. ZW sex-determination system B. XX sex-determination system C. XY sex-determination system D. XO sex-determination system 6 Answer the following questions related to sex determination in human beings: I. What is a sex chromosome? II. How many pairs of chromosomes are there in human beings? III. How is the sex of the human offspring determined? IV. Draw a diagram depicting sex determination in man. 7 How many pairs of chromosomes are present in human beings? Out of these how many are sex chromosomes? How many types of sex chromosomes are found in human beings? "The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it". Draw a flow chart showing determination of sex of a newborn to justify this statement. 8 "The sex of the children is determined by what they inherit from their father and not their mother". Justify. 9 If X chromosome is inherited from mother and Y from father, what will be the offspring sex? 10 A zygote which has inherited an X chromosome from the father will develop into? Page 1 Email: Phone No: Website:
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