Chapter 6
Basic Principles of Inheritance
Exercises
1. Differentiate between the following
(a) Genotype and Phenotype
Answer:
(b) Dominant and Recessive characters
Answer:
(c) Hybrid and Pure individuals
Answer:
(d) Heterozygous and Homozygous progeny
Answer:
(e) Monohybrid and Dihybrid cross
Answer:
(f) Gene and allele
Answer:
(g) Incomplete dominance and codominance
Answer:
2. Mention the genotypic and phenotypic ratio of progeny when there is a cross between
Answer:
3. Explain test cross through diagrammatic representation.
Answer:
4. Explain following using monohybrid cross
(a) Law of dominance
(b) Law of segregation
(c) Law of independent assortment
Answer:
5. What will be the genotypic and phenotypic ratio when a red and tall homozygous tomato plant is crossed to a red and tall heterozygous plant?
Answer:
6. When one male and one female Drosophila, heterozygous for the two pairs of alleles AaBb, were mated, the offspring’s phenotypic ratio 2:1:1:2 was obtained.
(a) Explain how these ratios help in detecting linkages?
(b) How degree of linkage can be determined?
7. Make a close observation with the nature. Do you think that the phenomenon of linkage is absolute?
Answer: