My today's question
Biology of 8th
Chapter - Reaching the Age of Adolescence
1. An egg cell, fertilised by a sperm cell containing x chromosomes,develop into a girl. Explain How?
2. What is Secondary sexual characters and how to develop
3. what is puberty
4. Explanation of Development of Sex Organs
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1)Meiosis forms haploid gametes (sperm and egg cells). All eggs contain one X chromosome. 50% of sperm contain one X chromosome and 50% contain one Y chromosome. During fertilisation , there is a 50% chance that a sperm containing an X chromosome will fuse with the egg; this would result in a baby girl – XX.
2)Differences in size between sexes are also considered secondary sexual characteristics. In humans, visible secondary sex characteristics include pubic hair, enlarged breasts and widened hips of females, and facial hair and Adam's apples on males.
3)Puberty is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads: the ovaries in a girl, the testes in a boy
4)The reproductive systems of males and females begin to develop soon after conception. ... Testosterone produced by Leydig cells in the embryonic testis stimulates the development of male sexual organs. If testosterone is not present, female sexual organs will develop.
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