Q21 of 38 Page 1

(a) How does speciation take place?

(b) Define the term GENE.


(c) The gene for red hair is recessive to the gene for black hair. What will be the hair colour of a child if he inherits a gene for red colour from his mother and a gene for black hair from his father? Express with the help of flow chart.

(a) Speciation takes place by genetic drift, migration, natural selection, mutation.


(b) Gene is the segment of DNA which encodes a particular protein.


(c) The colour of hair of the child will be black as black is dominant over red.



More from this chapter

All 38 →
20

Draw a longitudinal section of a flower and label the following parts –

(a) Part that develops into a fruit


(b) Part that produces pollen grain


(c) Part that transfers male gametes


(d) Part that is sticky to trap.

 20

Write the names of the parts labeled as A, B, C, D in the diagram given below:

 22

Explain the formation of rainbow in the sky with the help of a diagram. List the three phenomena of light involved. Which colour – violet or red appears at top of the rainbow?

 22

What is the difference in colours of the sun observed during sunrise/sunset and noon? Give explanation for each.