. Cystinuria is an autosomal recessive disorder, characterized by formation of stones in the kidneys. Heterozygous persons have an elevated level of cystin in urine. What type of gene interaction is present?
Incomplete dominance
Children with normal hearing have been born to deaf and dumb pa¬rents with the genotype DDee and ddEE. What is the form of gene interaction between the genes D and E?
Complementary
A woman with 0 (I) blood group has given a birth to a child with AB blood group. This woman's husband has A blood group. What genetic interaction explains this phenomenon?
Recessive epistasis
What are the chances of a woman with Type AB and a man with Type A having a child with Type O?
0%
When defining blood group according to the AB0 system, using salt solution of monoclonal antibodies, agglutination didn’t occur with any of the solution. What blood group is it?
0
. Biosynthesis of an interferon molecule is controlled by two dominant non allele genes. What type of interaction is between these genes?
Complementary
The cross gives a ratio of 13:3. What type of gene interaction?
Epistasis
A boy has I blood group and his sister has IV blood group. What blood groups do their parents have?
II and III
Hartnup disease is caused by point mutation of only one gene which results in disturbance of tryptophane absorption in the bowels and its absorption in the renal tubules. It is the reason for disorder of both digestive and urinary systems.
Pleiotropy
The intensity of human skin pigmentation is controlled by a few pairs of nonallelic dominant genes. The bigger is the quantity of the genes, the more pigmentation appears. How is this type of gene interaction termed?
Polymery
A patient is sick with the Marfian’s syndrome. This syndrome is an example of the following genetic phenomenon:
Pleiotropy
The example of codominance is:
AB blood group
Human height is believed to be controlled by at least three pairs of genes. What type of gene interaction?
Polygenic traits