YVUL
30. Explain the phenomenon of sex determination 'in human being.
31. State two merits of parallel connection of resistors in the circuit.
Answers
30. Human beings have XX_XY sex determination system. In this, the males have XY sex chromosomes. ... The Y chromosome carries factors responsible for triggering male development. The X chromosome carries factors responsible for triggering female development.
31. 1) In parallel combination each appliance gets the full voltage. 2) If one appliance is switched on/of others are not affected. 3) The parallel circuit divide the current through the appliances. Each appliance gets proper current depending on its resistance.
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31. The females carry two X-chromosomes. Females produce one type of gametes (eggs) with same type of chromosomes (22 + X). Males have one X and one Y chromosome. Among the male gametes, half of the sperms carry X-chromosome (22 + X) and half carry Y-chromosome (22 + Y). Thus female is homogametic and male is heterogametic.
When a sperm carrying X chromosome fertilizes an egg, the zygote develops into female (XX condition). When sperm carrying Y chromosome fertilizes an egg, the zygote develops into a male (XY condition). Thus, sex is determined at the time of fertilization.
32.
Advantages of parallel combination over series combination are: 1) In parallel combination each appliance gets the full voltage.
2) If one appliance is switched on/of others are not affected.
Explanation:
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