The pedigree in the accompanying illustration shows the inheritance of albinism, a homozygous recessive condition resulting in a
total lack of pigment. Specify the following genotypes using A and a to indicate dominant and recessive alleles, respectively. The solid figures represent albino individuals. What is the likely genotype of individual B-3?
1 answer:
The question lacks the pedigree information. The pedigree has been attached below.
Answer:
AA/Aa.
Explanation:
The albino is a autosomal recessive trait means this trait will only be visible when the individual is homozygous recessive for the trait. The heterozygous individual acts as a carrier.
In the given, pedigree the parents are unaffected but one of their child is affected means that the parents are heterozygous for the trait. The croos between the parent Aa × Aa results in the progeny with genotype AA, Aa, Aa ( normal ) and aa (affected). The individual B-3 is unaffected and can have either genotype AA or Aa.
Thus, the answer is AA or Aa.
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Explanation:
Answer No 1:
The set up of the punnet square is shown in the attached diagram. As the alleles assort independently hence the gametes formed will be OT,Ot,OT,Ot and OT,Ot,oT,ot. These will be the outcomes of the possible gametes formed. When these gametes are cross bred, the results are shown in the diagram attached.
Answer No 2:
The outcomes of each possible genotype are:
OOTT = 2/16
OOTt = 4/16
OOtt = 2/16
Oott = 2/16
OoTT = 2/16
OoTt = 4/16
Answer No 3:
The likelihood of each possible offspring phenotype is:
Orange petals with tall stem and orange petals with small stems present in ratio 12:4 i.e. 3:1.
