Heredity and Evolution Objective Type Questions and Answers

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

A Double fertilization

B Self pollination

C Cross fertilization

D No fertilization

View Answer

Answer: Cross fertilization

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

A Round and yellow

B Round and green

C Wrinkled and green

D Wrinkled and yellow

View Answer

Answer: Round and yellow

23 In human males all, the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are

(i) Large chromosome (ii) Small chromosome (iii) Y-chromosome (iv) X-chromosome

A (i) and (ii)

B (iii) only

C (iii) and (iv)

D (ii) and (iv)

View Answer

Answer: (iii) and (iv)

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

A Boy

B Girl

C X-chromosome does not determine the sex of a child

D Either boy or girl

View Answer

Answer: Girl

25 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

A (I) and (ii)

B (I) and (iii)

C (ii), (iii) and (iv)

D (i), (ii) and (iii)

View Answer

Answer: (I) and (ii)

26 Two pea plants, one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that have round, yellow (RrYy) seeds. When F1 plants are selfed, the F2 progeny will have new combination of characters. Choose the new combination from the following.

(i) Round, yellow (ii) Round, green (iii) Wrinkled, yellow (iv) Wrinkled, green

A (i) and (ii)

B (i) and (iv)

C (ii) and (iii)

D (i) and (iii)

View Answer

Answer: (i) and (iv)

27 If the fossil of an organism is found in the deeper layers of earth, then we can predict that

A The extinction of organism has occurred recently

B The extinction of organism has occurred thousands of years ago

C The fossil position in the layers of earth is not related to its time of extinction

D Time of extinction cannot be determined

View Answer

Answer: The extinction of organism has occurred thousands of years ago

28 Which of the following statements is not true with respect to variation?

A All variations in a species have equal chances of survival

B Change in genetic composition results in variation

C Selection of variants by environmental factors forms the basis of evolutionary processes

D Variation is minimum in asexual reproduction

View Answer

Answer: All variations in a species have equal chances of survival

29 Select the group which shares maximum number of common characters

A Two individuals of a species

B Two species of a genus

C Two genera of a family

D Two genera of two families

View Answer

Answer: Two individuals of a species

30 The two versions of a trait (character) which are brought in by the male and female gametes are situated on

A Copies of the same chromosome

B Two different chromosomes

C Sex chromosomes

D Any chromosome

View Answer

Answer: Copies of the same chromosome

31 Select the statements that describe characteristics of genes

(i) Genes are specific sequence of bases in a DNA molecule (ii) A gene does not code for proteins (iii) In individuals of a given species, a specific gene is located on a particular chromosome (iv) Each chromosome has only one gene

A (i) and (ii)

B (i) and (iii)

C (i) and (iv)

D (iii) and (iv)

View Answer