In an example of recessive epistasis the product H substance

In an example of recessive epistasis the product H substance is needed to express the blood antigen. A mating of IA I B Hh X IB I O Hh should produce what ratio of blood types? a. 1/4 AB, 1/8 A, 1/8 B, 1/2 O b. 3/8 AB, 3/16 A, 3/16 B, 1/4 O c. 1/4 AB, 3/16 A, 3/16 B, 3/8 O d. 1/2 AB, 1/4 A, 1/8 B, 1/8 O e. 3/16 AB, 3/16 A, 3/8 B, 1/4 O

Solution

In an example of recessive epistasis the product H substance is needed to express the blood antigen. A mating of IA I B Hh X IB I O Hh should produce what ratio of blood types?

a. 1/4 AB, 1/8 A, 1/8 B, 1/2 O

b. 3/8 AB, 3/16 A, 3/16 B, 1/4 O

c. 1/4 AB, 3/16 A, 3/16 B, 3/8 O

d. 1/2 AB, 1/4 A, 1/8 B, 1/8 O

e. 3/16 AB, 3/16 A, 3/8 B, 1/4 O------------ANSWER

A mating of   I^A I ^B H h    X    I^B I^O Hh should produce what ratio of blood types?

Gametes

I^A H   

I^A h   

I ^B H  

I ^B   h   

I^B H   

I^A H I^B H  

Blood type AB      

I^A h I^B H

Blood type AB            

I ^B H   I^B H

Blood type B        

I ^B   h I^B H

Blood type B      

    

I^B h   

I^A H   I^B h   

Blood type AB        

I^A h   I^B h  

Blood type O

RECESSIVE EPISTASIS      

I ^B H   I^B h

Blood type B          

I ^B   h    I^B h

Blood type O      

RECESSIVE EPISTASIS

   

I^o H   

I^A H I^o H   

Blood type A           

I^A h    I^o H

Blood type A          

I ^B H   I^o H

Blood type B         

I ^B   h I^o H

Blood type B        

    

I^o h   

I^A H    I^o h   

Blood type A      

I^A h    I^o h

Blood type 0 RECESSIVE EPISTASIS      

I ^B H I^o h

Blood type B            

I ^B   h    I^o h

Blood type O RECESSIVE EPISTASIS      

e. 3/16 AB, 3/16 A, 3/8 B, 1/4 O------------ANSWER

Blood type A

3/16

3/16

Blood type B

6/16

3/8

Blood type AB

3/16

3/16

Blood type 0

4/16

1/4

Bombay phenotype (hh) do not express H antigen

Bombay phenotype (hh) do not express H antigen (also called substance H),

the antigen which is present in blood group O.

because , they cannot make

A antigen (also called substance A)

or

B antigen (substance B) on their red blood cells

Gametes	IA H	IA h	I B H	I B   h
IB H	IA H IB H   Blood type AB	IA h IB H Blood type AB	I B H   IB H Blood type B	I B   h IB H Blood type B
IB h	IA H   IB h    Blood type AB	IA h   IB h   Blood type O RECESSIVE EPISTASIS	I B H   IB h Blood type B	I B   h    IB h Blood type O       RECESSIVE EPISTASIS
Io H	IA H Io H    Blood type A	IA h    Io H Blood type A	I B H   Io H Blood type B	I B   h Io H Blood type B
Io h	IA H    Io h    Blood type A	IA h    Io h Blood type 0 RECESSIVE EPISTASIS	I B H Io h Blood type B	I B   h    Io h Blood type O RECESSIVE EPISTASIS