How is the equal genetic contribution of male and female parents ensured in the progeny?
Equal genetic contribution of male and female parents is ensured by the equal number of inheritance of chromosomes. Human beings possess a normal diploid (2N) chromosome number in human beings is 46. Each body cell contains 23 pairs of chromosomes, with 22 pairs of autosomes and one pair of sex chromosome. The autosomes are similar in male and female but one sex chromosome is different in both. In females, sex chromosomes are same XX and heteromorphic in males, i.e, XY. Sex chromosomes control the sex of an individual. One male haploid gamete and one female haploid gamete form a diploid cell gamete by sharing equal amounts of genetic material from both paternal and maternal parents. If the zygote receives one X chromosome from a female and another X chromosome from male then the child will be female, i.e, XX. And when the zygote receives one X chromosome from a female and another Y chromosome from male then the child will be male.
Popular Questions of Class 10 Science
- Q:-
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
- Q:-
Outline a project which aims to find the dominant coat colour in dogs.
- Q:-
Draw the structure for the following compounds.
(i) Ethanoic acid (ii) Bromopentane*
(iii) Butanone (iv) Hexanal.*Are structural isomers possible for bromopentane?
- Q:-
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
- Q:-
How is the sex of the child determined in human beings?
- Q:-
(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common? - Q:-
Calculate the number of electrons constituting one coulomb of charge.
- Q:-
What is an homologous series? Explain with an example.
- Q:-
Why is variation beneficial to the species but not necessarily for the individual?
- Q:-
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
Recently Viewed Questions of Class 10 Science
- Q:-
What would be the consequences of a deficiency of haemoglobin in our bodies?
- Q:-
Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.
- Q:-
Explain different ways to induce current in a coil.
- Q:-
Find the focal length of a lens of power – 2.0 D. What type of lens is this?
- Q:-
What will be the formula and electron dot structure of cyclopentane?
- Q:-
What type of oxides are formed when non-metals combine with oxygen?
- Q:-
Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?
- Q:-
By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?
Ga Ge As Se Be - Q:-
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
- Q:-
What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.
- NCERT Chapter