13. The Theory Of Evolution Of Species By Natural Selection Was Given By, A. Mendel, B. Darwin , C.

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

 

13. B. Darwin

• The theory of evolution is a shortened form of the term "theory of evolution by natural selection," which was proposed by Charles Darwin and Alfred Russel Wallace.

14. D. tallness is the dominant trait

• A cross between a tall plant (TT) and short pea plant (TT) resulted in progeny that were all tall plants because tallness is the dominant trait.

15. A. 1

• The number of sex chromosomes in the zygote of humans is one pair.

16. A. Girl

• A zygote that has an X-chromosome inherited from father will develop into a girl.

17. D. Equal chance of acquiring blood group A or blood group O

• Blood group O, is the recessive blood type. It requires both parents to carry at least one o genes. Its genotype can only be OO. The A and B genes are codominant with one another. That is, they can both be present in someone and both the characteristics of a blood and B blood will show. Both will overwhelm o genes if present. Parent A is O, parent B is B. B has two different genotypes, BB and Bo indicates the presence of a recessive O gene, getting masked by the B gene. If BB, the odds of a childs blood genotypes are as follows:100%Bo blood type, this would exhibit as a B blood type. If the B typed parent is a Bo genotype odds are as follows:50%BO,50%OO. Either a B blood type or o blood type.

18. A. All are tall with round seeds

• The progeny of a tall plant with round seeds (TTRR) and a short with wrinkled seed (TTRR) would be tall with round seeds (TtRr) and thus will appear same as allele for tall plant and round seeds are dominant over the alleles for short plants with wrinkled seeds.

19. B . round and yellow

• The crossing of round green seeded pea plant (RRyy) with wrinkled yellow seeded pea plant, (rrYy) results in F1 progeny with round and yellow seeds. This shows that the character for round seeds and yellow cotyledons is dominant over wrinkled and green respectively.

20. B. Africa

•The human species has genetic roots in Africa.