Biology Chapter 13 Entry test MCQs
26. In Mendelian dihybrid cross, how many of progeny in F2 generation possess genotype rryy?
a. 2/16
b. 1/16
c. 4/16
d. 3/16
27. In the dihybrid cross, the number of round green seeds that were homozygous for round trait:
a. 3
b. 2
c. 4
d. 1
Dominance Relations
28. As a result of cross-fertilization of true breeding pea plant having purple colored flowers with that of white colored flowers, the offspring will have flower with:
a. % white and purple
b. % purple and white
c. All purple
d. All white
29. Incomplete dominance:
a. The phenotype of the heterozygote is intermediate between phenotypes of the two homozygotes.
b. Different alleles of a gene are both expressed in heterozygous condition
c. Gene mutations may produce many different alleles of a gene.
d. One allele is completely dominant over the other and the presence of the recessive allele is functionally hidden so the heterozygote has the same round phenotype as homozygote.
Multiple Alleles and ABO Blood Group System
30. Alleles from a gene arise by:
a. Mutation
b. Genetic drift
c. Non-random mating
d. Natural selection
31. Inheritance of ABO blood group system is an example of:
a. Complete dominance
b. Multiple allelism
c. Gene linkage
d. Co-dominance
32. Multiple alleles are the altered forms of a gene whose number is more than two and may have as many as 300 alleles, but a diploid organism can:
a. Have two of them in its genome
b. Have just one of them in its genome
c. Have multiple of them in its genome
d. Have four of them in its genome
33. In humans, the polymorphic gene ‘I’ has three multiple alleles which are the result of:
a. Sex linkage
b. Complete dominance
c. Gene linkage
d. Mutation
34. The genotype of blood group ‘A’ can be:
a. I ^ B I ^ B
b. I ^ A I ^ A
c. I^A I^i
d. I ^ A I ^ A or
35. A person with antigens ‘B’ present of membrane of RBCs and anti-A’ antibodies in the blood plasma will have:
a. Blood group ‘B’
b. Blood group ‘A’
c. Blood group ‘O’
d. Blood group ‘AB’
36. If a female has ` A’ blood group and her husband has ‘O’ blood group, then the blood group of their children would possibly be:
a. AB only
b. A and B groups only
c. All four groups
d. A and O groups only
37. ABO blood grouping is controlled by gene I which has three alleles and show co- dominance. There are six genotypes. How many phenotypes are possible?
a. Three
b. Six
c. Five
d. Four
38. Which of the following blood groups is not possible in a person whose father is of blood group O?
a. A
b. AB
c. O
d. B
39. A man having a blood group O marries a woman having a blood group A whose father was also O. What is the probability of ‘O’ in their offspring?
a. 25%
b. 50%
c. 0%
d. 75%
40. Which of the following blood group is considered as universal donor?
a. AB-ve
b. AB+ve
c. O+ve
d. AB+ve
41. Blood group antigens can be found in:
a. Saliva
b. R.B.Cs
c. Body fluids
d. All A, B, C
42. ABO blood system is an example of:
a. Multiple genes
b. Polygenes
c. Multiple mutation
d. Multiple alleles
43. Which one of the following is multiple allelic character?
a. Shape of seed in pea plant
b. Length of stem in pea plant
c. Colour of flower in pea plant
d. Blood group of the human being
44. If Sara has blood group O. The genotype of her mother and father is possibly:
a. Bi X Bi
b. Bi X BB
c. BB X Bi
d. BB X BB
Rh Blood Group System and Erythroblastosis Foctalis
45. Rh factor is named after:
a. Rat
b. Man
c. Chimpanzee
d. Monkey
46. Which of the following is genetically dominant in man?
a. Rh positive
b. Colour blindness
c. Albinism
d. Haemophilia
47. Rh factor may be responsible for:
a. AIDS
b. Turner’s syndrome
c. Erythroblastosis fetalis
d. Sickle-cell anaemia
48. A character determined by three alleles is:
a. Human blood group
b. Human skin color
c. Human Rh factor
d. Human eye color
49. Relationships between alleles of ABO blood group system can be explained by:
a. Over dominance and Incomplete dominance
b. Complete dominance and Co dominance
c. Complete dominance only
d. Incomplete dominance and Co dominance
50. ABO blood group system was discovered by:
a. Karl Correns
b. Bernstein
c. Johannsen
d. Landsteiner