Heredity and evolution Worksheets

Heredity and evolution Worksheet-10

1. One of the examples of two analogous organs can be the wing of parrot and

A. flipper of whale                        B. foreleg of horse

C. front leg of frog                        D. wings of housefly

2. Male human is represented by sex chromosomes

A. XX                  B. YY                   C. XY                   D. None of these

Heredity and evolution Worksheet-11

1. If a plant heterozygous for tallness is selfed, the F₂ generation has both tall and dwarf plants in 3:1 ratio. This proves the principle of :

A. Dominance

B. Segregation

C. Independent assortment

D. Incomplete dominance

2. If an enzyme responsible for the production of phytohormone (for plant height) becomes active then that phytohormone brings phenotypic change. If the gene for that enzyme has an alteration it makes the enzyme less efficient and the amount of hormone will be less, consequently the plant will be short. This shows that

A. Traits are controlled by genes

Heredity and evolution Worksheet-12

11. Some species of dinosaurs had feathers, although they could not fly using the feathers. What was the purpose of this adaptation by some of the reptiles?

A. Providing adaptation in the limb

B. Providing insulation in cold weather

C. Providing skin folded stretch in arms

D. None of these

12. The given figures show the wings of two animals with analogous organs. Identify them.