Botany-Principles of Inheritance and Variation - Online Test
Q1. In blood group typing in human, if an allele contributed by one parent is IA and an allele contributed by the other parent is i, the resulting blood group of the offspring will be
Answer : Option D
Explaination / Solution:
Blood group alleles IA and i is A. As allele A is dominant over the allele i. O blood group appear only when both the alleles are i.
Q2. Inheritance of skin colour in human being is an example of
Answer : Option D
Explaination / Solution:
Skin colour in human being is controlled by many genes so it is an example of polygenic inheritance.
Q3. Which of the following is an example of co-dominance?
Answer : Option A
Explaination / Solution:
Co-dominance is the phenomenon that deviates from Mendel’s law of inheritance. Both the alleles appear in offspring instead of one as in Mendel’s experiment. ABO blood grouping in human being is example of co-dominance in which both IA and IB appear simultaneously to form AB blood type.
Q4. A human male produces sperms with the genotypes AB ,Ab , aB , ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?
Answer : Option A
Explaination / Solution:
The genotype AaBb of a male produce gametes AB,Ab, aB and ab in equal proportion as the law of segregation.
Q5. In Mirabilis jalapa when two F1 pink flowered plants were crossed with each other, the F2 generation produced 40 red, 80 pink and 40 white flowering plants. This a case of
Answer : Option D
Explaination / Solution:
F1pink flowered plants are heterozygous. When selfing is done the genotype and phenotype develops as 1:2:1 as 40 red, 80 pink and 40 white flowering plants.
Q6. A person with unknown blood group under ABO system has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend, who has a valid certificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?
Answer : Option D
Explaination / Solution:
A person with unknown blood group under ABO grouping should be given Type O blood group as O is universal donor and can be transfused to any person.
Q7. In T. H. Morgan"s Experiment on Drosophilia what will be the result when F1 female flies are crossed with double recessive male files?
Answer : Option A
Explaination / Solution:
When F1 female flies (Drosophila) obtained in crossed with double recessive male flies 83% parental combination are obtained along with 17% recombinant offspring are formed.
Q8. ABO blood groups in humans are controlled by the gene I. It has three alleles - IA, IB and i . Since there are 3 different alleles, six different genotypes are possible. How many phenotypes occur?
Answer : Option D
Explaination / Solution:
The three alleles - IA, IB and i will form four different kinds of blood group A, B, AB and O. as IA and IB are dominant and i is recessive in nature.
Q9. Heterozygous tall plants were crossed with dwarf plants what will be the ratio of dwarf plants in the following progeny?
Answer : Option B
Explaination / Solution:
Heterozygous tall plant (Tt) is crossed with homozygous dwarf (tt) the percentage of dwarf plants is 50 percent.
Q10. A cross between AaBB X aaBB yields a genotypic ratio of
Answer : Option D
Explaination / Solution:
Genotypic ratio of cross between AaBB and aaBB will be 1:1 as AaBB and aaBB in F1 generation.
