If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
No Chance
50%
25%
25%
C.
25%
Thalassemia is the disorder due to reduced synthesis of either the alpha or beta chains, likewise designated as alpha or beta - thalassemias. When this autosomal mutant gene is present in a double dose. The disease is severely called as thalassemia major.
In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree. 
Autosomal dominant
X-linked recessive
Autosomal recessive
Autosomal recessive
The incorrect statement with regard to haemophilia is
It is a sex - linked disease
It is a recessive disease
It is dominant disease
It is dominant disease
Fruit colour in squash is an example of
recessive epistasis
dominant epistasis
complementary genes
complementary genes
A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind?
0.5
1
Nil
Nil
Which enzyme/s will be produced in cell in which there is a non-sense mutation in the lac Y gene?
beta - galactosidase
Lactose permease
Transacetylase
In his classic experiments on pea plants, Mendel did not use
Seed colour
Pod length
Seed shape
Seed shape
A normal-visioned man whose father was colour-blind, marries a woman whose father was also colour-blind. They have their first child as a daughter. What are the chances that this child would be colour-blind?
100%
0%
25%
25%
A gene showing codominance has:
One allele dominant on the other
alleles tightly linked on the same chromosome
alleles that are recessive to each other
alleles that are recessive to each other
