What will be the sex of a child who inherits Y chromosome from his/her father?

One of the examples of two analogous organs can be wings of parrot and

(a) filler of whale (b) foreleg of horse

(c) front leg of frog (d) wings of housefly

“Genes and chromosomes have similar behaviour.” Justify.

Name the scientific terms used to represent the following:

(a) The branch of biology which studies heredity and variation.

(b) The transmission of traits from parents to offspring.

(c) Differences in a trait in human beings.

(d) A recognisable feature of an organism.

How does DNA help in defining evolutionary relationship?

Explain with an example how variation took place due to inheritance.

Explain Mendel’s experiment with peas on inheritance of traits considering two visible contrasting characters.

Explain with an example how traits get expressed.

On the basis of the possibilities of combination of the sex chromosomes, what percentage probability does a couple have of having a son or a daughter? Show the same by making a cross.

‘Non-living material must have given rise to life’. Describe with an example.

What role does sexual reproduction play in evolution?

Explain with example how characteristics of a population changes over the years for the following situations-

(a) To gain survival advantage

(b) Due to accidental survival

(c) Temporary change of characteristics.

While playing near a sugarcane field, Mohan noticed that the plants are almost similar to one another. At the same time, he noticed the mango trees in the next plot of land which are not similar to one another. Mohan’s brother told Mohan that sugarcane reproduces asexually, hence there is little variation, Mango reproduces sexually, and hence there is larger variation.

(a) Why sugarcane cannot reproduce sexually?

(b) Can mango reproduce asexually?

(c)If a person wants to have a flower garden, what type of plants should he grow?