Biology. ICSE. Class - X
Unit 1 Chapter - 3. Question Paper
Genetics - Some Basic Fundamentals
Short Questions
1. Name the father of Genetics.
2. Define monohybrid cross
3. Define dihybrid cross.
4. In what condition of genotype a recessive charter will get expressed ?
5. What is mutation?
6. Name a disease of human which caused due to gene mutation.
7. What is genotype?
8. What is phenotype?
Mark: 5 for each question
1. A homozygous dominant tall plant bearing red flower (TTRR) is crossed with a homozygous recessive dwarf pea plant bearing white flowers (ttrr).
i) what is the phenotype and genotype of F1 individual?
ii) Write the possible combination of gametes that are obtained when to F1 hybrid plant are crossed.
iii) Mention the phenotype ratio of the F2 generation
iv) State mendel's law of independent assortment.
v) Name two X linked disorder found in humans
2. In Mendel 's experiment tall pea plants (T) are dominant over dwarf pea plant (t).
i) What is the phenotype and genotype of the F1 generation if a homozygous tall plant is crossed with the homozygous dwarf plant?
ii) Draw a punnett square board to show the gametes and offspring when both the parents are heterozygous for tallness.
iii) What is the phenotypic ratio and genotypic ratio of the above cross in (ii) ?
iv) State Mendel's law of dominance.
v) What is dihybrid cross?
3. A plant which is homozygous for greenpod which are inflated (GGII) is crossed with the homozygous plant for yellow pod which are constricted (ggii).
Answer the following questions:
i) Give the phenotype and genotype of the F1 generation.
Which type of pollination is occured to produce F1 generation?
ii) Write the phenotypic ratio of F2 generation.
iii) Write possible combination of the gametes that can be obtained if two F1 hybrid plant are crossed.
iv) State Mendel's law of Segregation of gametes.
v) What is the scientific name of the plant which Mendel used for his experiments of inheritance?
4. In a homozygous pea plant axial flowers (A) are dominant over terminal flower (a) -
i) What is the phenotype and genotype of the F1 generation if a plant bearing pure axial flowers is crossed with a plant bearing pure terminal flower?
ii) Draw a punnett square to show the gametes and off spring when both the pea plants heterozygous for axial flower.
iii) What is the phenotypic ratio and genotypic ratio of the above cross shown in (ii) ?
iv) State Mendel's law of dominance.
v) Name two genetic disorder commonly seen in human male.
