Question

Q.20. The gene for blue eyes (b) is recessive to gene for brown eyes (B). The given figure
shows both brown and blue eyes.

(a) Write the symbol of the mother (genotype).
(b) What is the genotype of grandmother and grandfather?
(c) What is the percentage of individuals with brown and blue eyes respectively?
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Answer 1

Answer:

(a) Bb

(b) Grand mother - bb

Grand father - BB

(c) Brown - 75 %

Blue - 25%

Hope this will help you.

Answer 2

The parents are homozygous recessive (bb) and homozygous dominant (BB). Homozygous recessive people have blue eyes, the only time the condition is expressable.

(a) The symbol of mother genotype is Bb

(b) The genotype of grand mother is bb

The genotype of grand father is BB

(c) The percentage of individuals having brown eyes is 75 %

The percentage of individuals having blue eyes is 25%