Heredity and evolution Worksheets

Heredity and evolution Worksheet-16

1. Define the terms :

(i) Analogous organs          (ii) Sex chromosome

2. In terms of evolution, what is the significance of homology between a human hand and a wing of a bird?

3. What is meant by analogous organs? Taking a suitable example, explain how they support the theory of Organic Evolution.

4. Mention any four details that can be inferred about organisms from their fossils.

5. What are fossils? Of what interest are fossils to the evolutionary biologists?

Heredity and evolution Worksheet-17

31. Explain why evolution cannot be said to progress from lower forms to higher forms.

32. How environment determines sex of a new born in some organism?

33. How do DNA help in defining evolutionary relationship?

34. Give two examples of organisms in which environmental factors regulate sex determination.

35. "Genes and chromosomes have similar behaviour." Justify.

36. Name the scientific terms used to represent the following :

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

Heredity and evolution Worksheet-18

61. How human evolution took place over the years?

62. Explain Mendel's experiment with peas on inheritance of traits considering only one visible contrasting character.

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

64. Explain with an example how traits get expressed.

65. Draw a schematic diagram to explain the independent inheritance of two separate traits, shape and colour of seeds.

66. How do homologous characteristic help to identify an evolutionary relationship between different species?