Science
Consider the following statements :
(a) The sex of a child is determined by what it inherits from the mother.
(b) The sex of a child is determined by what it inherits from the father.
(c) The probability of having a male child is more than that of a female child.
(d) The sex of a child is determined at the time of fertilisation when male and female gametes fuse to form a zygote.
The correct statements are:
options
- (a) and (c)
- (b) and (d)
- (c) and (d)
- (a), (c) and (d)
Answer
(b) and (d)
Reason —
- Statement (a) is incorrect.
Corrected statement : The mother’s egg always carries an X chromosome, so she cannot determine the sex of the child.
Statement (b) is correct.
Statement (c) is incorrect.
Corrected statement : The probability of having a boy or girl is equal (50–50 chance) because half of the sperms carry X and half carry Y.
- Statement (d) is correct.
Hence, correct statements are (b) and (d).
Related Questions
Oxides of aluminium and zinc are:
options
- Acidic
- Basic
- Amphoteric
- Neutral
The reaction given below is a redox reaction because in this case :
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
options
- MnO2 is oxidised and HCl is reduced.
- HCl is oxidised.
- MnO2 is reduced.
- MnO2 is reduced and HCl is oxidised.
Chromosomes :
(a) carry hereditary information from parents to the next generation.
(b) are thread like structures located inside the nucleus of an animal cell.
(c) always exist in pairs in human reproductive cells.
(d) are involved in the process of cell division.
The correct statements are :
options
- (a) and (b)
- (c) and (d)
- (a), (b) and (d)
- (a) and (d)
In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as:
options
- Axon
- Dendrites
- Neuromuscular junction
- Cell body