Question

2. Dominant trait: cleft chin (C) Mother’s gametes: Cc

Recessive trait: lacks cleft chin (c) Father’s gametes: cc
Offspring Genotypes:
Offspring Phenotypes:
% chance child will have cleft chin:



3. Dominant trait: flat feet (A) Mother’s gametes: Heterozygous
Recessive trait: arched feet (a) Father’s gametes: Heterozygous

% chance child will have arched feet:


4. Dominant trait: Brown hair (B) Mother’s gametes: Homozygous recessive
Recessive trait: Blonde hair (b) Father’s gametes: Heterozygous
% chance child will have blonde hair:

5. Dominant trait: farsightedness (F) Mother’s gametes: Heterozygous
Recessive trait: normal vision (f) Father’s gametes: Heterozygous
% chance child will have normal vision:

Answer 1

Answer No 2:

c c

C Cc Cc

c cc cc

The genotype of the offsprings would be Cc, Cc, cc, cc i.e heterozygous cleft chin and no cleft chin. The phenotype of the offsprings could be 50% cleft chin and 50% without cleft chin.

there will be 50% chance of the child to have cleft chin.

Answer No 3:

A a

A Aa Aa

a Aa aa

There will be 25% chance for the offspring to have arched feet. As arched feet is a recessive trait, so for this trait to occur both the alleles of the gene should be recessive i.e aa.

Answer No 4:

B b

b Bb bb

b Bb bb

As blonde is a recessive trait, so both the alleles for this gene should be recessive for this trait to occur. Hence, according to the punnet square, there will be 50% chance for the offspring to be blonde.

Answer No 5:

F f

F FF Ff

f Ff ff

As normal vision is a resessive trait, hence both the alleles of the gene should be recessive for the trait to occur. According to the punnet square, there is 25% chance that the child will have normal vision.