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Question
Write a short note on sex determination in man.
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Solution
The difference between two individuals of the same species with respect to heredity is known as sex. So, an individual can either be a male or female in normal circumstances. Scientists have discovered that sex is transmitted by definite sex determination, also called heterosomes. The human body cells have two sex- chromosomes. A woman has two X- chromosomes while a man has one X- chromosome and one Y-chromosome.
Therefore, an egg cell has one X- chromosome and a sperm cell have either an X- or a Y-chromosome. This means that the sex of a baby is determined by the type of sperm cell fertilizing the egg. If an egg, fused with a sperm having Y-chromosome, then the male zygote will develop and when fused with a sperm having an X-chromosome then a female zygote will develop.
RELATED QUESTIONS
Differentiate between ‘ZZ’ and ‘XY’ type of sex-determination mechanisms.
Which of the two, sperm or ovum, decides the sex of the child?
The human animal which has an XY pair of chromosomes is called :
(a) male
(b) hybrid
(c) female
(d) doomed
What is heterogamety ? Explain the mechanism of sex determinatin in Drosophila.
Complete the following sentence with appropriate word:
___________ chromosomes do not take part in sex determination.
Short Answer Question.
“Father is responsible for determination of sex of child and not the mother”. Justify.
A woman has only daughters. Analyse the situation genetically and provide a suitable explanation.
The sex chromosome in a human ovum is ______.
Which biological mechanism establishes whether an individual develops as male or female based on genetic or chromosomal factors?
What did H. Henking originally call the nuclear structure he discovered during his 1891 study of squash bug spermatogenesis?
