Question Text
Question 2 :
Those organs which have different basic structure but have similar appearance and perform similar functions are called ?
Question 3 :
A zygote which has an X-chromosome inherited from the father will develop into a .......
Question 5 :
Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species?
Question 10 :
The number of pair(s) of sex chromosomes in the zygote of humans is
Question 13 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19ce5273b230584979b63.PNG' />
From the above figure, what are the ratios of the combinations of characters in the $F_2$ progeny?
Question 14 :
Birds are very closely related to reptiles. State whether this statement is True or False.
Question 15 :
How is the sex of the child determined in human beings?
Question 16 :
In a number of animals including human beings, which reproduce sexually, quite distinct variations are visible among different individuals. State whether this statement is True or False.
Question 18 :
The number of successful variations are maximised by the process of ____________
Question 19 :
If a trait 'A' exists in 10% of the population ofan asexually reproducing species and a trait 'B' exists in 60% of the same population, which trait is likely to have arisen earlier?
Question 20 :
Organs or features may be adapted to new functions during the course of ______