Class XI Practice Questions

1. Hemophilia is an X-linked recessive inheritance. If 50% of the daughters are

        diseased, 50% of the children carrier while 50% of the sons normal. What should be

        the genotype of each parent .Predict the genotype of next generation if the carrier

        daughter marries to a normal man.

2. “Plants do not produce antibodies, but they are also attacked by pathogens or face

         infavourable environmental conditions.” Explain how do plants cope with such

         adverse conditions.

3. Highlight the main differences in genotypic and phenotypic ratios  among Complete

         dominance, incomplete dominance and co-dominance with suitable examples.

4. Show , diagrammatically, the details of immunoglobulin structure.

5. Mendel had mentioned the existence of two alleles for each gene in his

         theories. Give one exception to it. Explain briefly with a suitable example.

6. Why is one required to study conjugation?

7. Sexual reproduction is not seen in microbes still sometimes they undergo the most important feature of sexual reproduction. What is that and how it takes place in bacterias?