Heridity and evolution

Human teeth and elephant’s tusk are

• Analogous organs

• Vestigial organs

• Homologous organs

• Rudimentary organs

Independent inheritance of two separate traits, shape and colour of seeds in Mendel’s cross on pea plants resulted in a observable ratio of;

• 3 : 1

• 9 : 3 : 3 : 1

• 1 : 1

• 9 : 4 : 2 : 1

Which of these is not a vestigial organ in human beings?

• Appendix

• Wisdom tooth

• Nictitating membrane

• Gall bladder

Evolution of wild cabbage is an example of:

• Artificial selection

• Natural selection

• Mutation

• Genetic drift

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

• Asia

• Africa

• Austraila

• China

Two pink colored flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be

• Double fertilisation

• self pollination

• cross pollination

• No pollination

Which of the following statement is incorrect?

• For every protein there is a gene.

• For every DNA there is a gene

• For production of every enzyme there is a gene.

• For every molecule of fat there is a gene

If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant (rr YY), the seeds produced in F1 generation are

• round and yellow

• round and green

• wrinkled and yellow

• wrinked and green

A zygote which has an X-chromosome inherited from the father will develop into a

• a boy

• a girl

• either boy or girl

• cant tell

New species may be formed if(i) DNA undergoes significant changes in germ cells(ii) chromosome number changes in the gamete(iii) there is no change in the genetic material(iv) mating does not take place

• (i) and (ii)

• (ii), (iii) and (iv)

• (i), (ii) and (iii)

• (iii) and (iv)