Question 1 :
A cross between two individuals results in a ratio of 9 : 3 : 3 :1 for four possible phenotypes of progeny. This is an example of a ?

Question 3 :
Study of the evolution of human beings indicates that all of us belong to a single species that evolved in Africa and spread across the world in stages.

Question 4 :
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are i) Large chromosome ii)Small chromosome iii)Y-chromosome iv)X-chromosome

Question 5 :
'If one bacterium divides, and then the resultant two bacteria divide again, the four individual bacteria generated would be very similar'. State whether this statement is True or False.

Question 7 :
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?

Question 8 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19ce4273b230584979b62.PNG' /> In the above figure, what are the combinations of character in the $F_2$ progeny? (i) Round and Green (ii) Round and Yellow (iii) Wrinkled and Green (iv) Wrinkled and Yellow

Question 10 :
A cross between a tall pea-plant (TT) and a short pea-plant (tt) resulted in progenies that were all tall plants because

Question 11 :
The contrasting trait of seeds of a pea plant that is dominant is

Question 13 :
Mendel chose pea plant for his experiments because (i) Easy to grow (ii)Short life span (iii)Easily distinguishible characters (iv) Larger size of flower (v) Self pollinated

Question 15 :
How is the sex of the child determined in human beings?

Question 16 :
The theory of evolution of species by natural selection was given by ?

Question 17 :
Birds are very closely related to reptiles. State whether this statement is True or False.

Question 18 :
What does the progeny of a tall plant with round seeds and a short plant with wrinkled seeds look like?

Question 20 :
A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as ?

Question 21 :
Choose the odd one out – Green pod, Yellow seed, Purple flower, Terminal flower.

Question 22 :
Do genetic combination of mothers play a significant role in determining the sex of a new born?

Question 23 :
Select the statement that describe characteristics of genes : (i) Genes are specific sequence of bases in a DNA molecule (ii) A gene does not code for proteins (iii) In individuals of a given species, a specific gene is located on a particular chromosome (iv) Each chromosome has only one gene

Question 25 :
Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria?

Question 28 :
The modern day Human species has evolved from its earliest ancestors who lived in ?

Question 29 :
In the following cross, RR YY x RR YY ,the characteristics of the progeny is

Question 30 :
According to the evolutionary theory, formation of a new species is generally due to