In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a)

In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a).

1. 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 flowers?
2. Draw a Punnett square board to show the gametes and off springs when both the parent plants are heterozygous for axial flowers.
3. What is the phenotypic ratio and genotypic ratio of the above cross shown in (ii).
4. State Mendel’s Law of Dominance.
5. Name two genetic disorders commonly seen in human males.

Answer

iv. Law of Dominance : Out of a pair of contrasting characters, only one is able to express while the other remains      suppressed.

v. Colour blindness, Haemophilia, Pattern baldness.

• Exam Year: 2017