Question 11: How is sex determined in human beings?
Class 12 - Biology - Principles of Inheritance and Variation Page 94
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Answer-11
Human beings exhibit male heterogamy. In humans, males (XY) produce two different types of gametes, X and Y. The human female (XX) produces only one type of gametes containing X chromosomes. The sex of the baby is determined by the type of male gamete that fuses with the female gamete.
Answer 12
Mendel’s Laws of Inheritance:
1. Genetics is the branch of biology, which deals with inheritance and variation of characters from parents to offspring.
2. Inheritance is the process by which characters or traits are transferred from one generation to the next.
3. Variation is the degree by which progeny differs from each other and with their parents. Humans knew from as early as 8000-1000 BC, that one of the causes of variation was hidden in sexual reproduction.
4. Gregor Johann Mendel, for the first time conducted experiments to understand the pattern of inheritance of variation in living beings.
5. Mendel’s Experimental Material
(i) He conducted experiments on garden pea plant (Pisum sativum) for seven years (1856-1863) and proposed the laws of inheritance in living organisms.
Human beings exhibit male heterogamy. In humans, males (XY) produce two different types of gametes, X and Y. The human female (XX) produces only one type of gametes containing X chromosomes. The sex of the baby is determined by the type of male gamete that fuses with the female gamete.
Answer 12
Mendel’s Laws of Inheritance:
1. Genetics is the branch of biology, which deals with inheritance and variation of characters from parents to offspring.
2. Inheritance is the process by which characters or traits are transferred from one generation to the next.
3. Variation is the degree by which progeny differs from each other and with their parents. Humans knew from as early as 8000-1000 BC, that one of the causes of variation was hidden in sexual reproduction.
4. Gregor Johann Mendel, for the first time conducted experiments to understand the pattern of inheritance of variation in living beings.
5. Mendel’s Experimental Material
(i) He conducted experiments on garden pea plant (Pisum sativum) for seven years (1856-1863) and proposed the laws of inheritance in living organisms.
Answered by
1
Answer:
Sex in humans is determined by the type of male haploid gamete that fuses with the female egg. The chromosome in the 23rd pair of a male gamete can be either X or Y. The female egg always has an X chromosome. ... male child (44A + XY) is the result of Fertilization of egg (22 + X) with a sperm carrying 22+Y chromosomes.
Explanation:
Inheritance is the process by which characters are passed on from parent to progeny; it is the basis of heredity. Variation is the degree by which progeny differ from their parents.
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