13. The theory of evolution of species by natural selection was given by
a. Mendel
b. Darwin
c. Lamarck
d. Weismann
14. A cross between a tall pea-plant (TT) and a short pea-plant (tt) resulted in progenies that were all tall plants because
a. tallness is the recessive trait.
b. shortness is the dominant trait.
c. height of pea-plant is not governed by gene T or t
d. tallness is the dominant trait.
15. The number of pairs of sex chromosomes in the zygote of a human being is
a. 1
b. 3
c. 1
d. 4
16. A zygote which has an X-chromosome inherited from the father will develop in to a ___.
a girl
b. boy
c. either boy or girl
d. X-chromosome does not influence the sex of a child.
17. A man with blood group A marries a woman having blood group O. What will be the blood group of the child?
a. O only
b. A only
C. AB
d. Equal chance of acquiring blood group A or blood group O.
18. What does the progeny of a tall homozygous plant with round seeds and a short plant with wrinkled seeds look like?
a. All are tall with round seeds.
b. All are short with round seeds.
c. All are tall with wrinkled seeds.
d. All are short with wrinkled seeds.
19. If a round, green seeded pea-plant (RRyy) is crossed with a wrinkled yellow a seeded pea- plant (rrYY), the seeds produced in F1 generation are
a. round and green
b. round and yellow
c. wrinkled and green
d. wrinkled and yellow
20. The human species has genetic roots in
a. Australia
b. Africa
c. America
d. Indonesia
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Answer:
13.B
14.C
15.A
16.C
17.C
18.A
19.D
20.C