Which of the following is a good example of polygenic (multiple gene) inheritance?
a) 4 O’ clock flower color
b) ABO blood group system
c) seed shape in garden pea
d) wheat grain colour
Wheat grains show…variation in colour.
a) continuous
b) discontinuous
c) both a and b
d) none of them
Explanation: from white to dark red with no distinct differences
How many different phenotypes are found in wheat population all over the world?
a) two
b) three
c) four
d) seven
Explanation: some are white, some are deep red, some are light pink to moderately dark red
Who studied the genetics of wheat grain colour?
a) Carl Correns
b) Bernstein
c) T.H. Morgan
d) Nilsson Elle
When Nilsson Elle crossed a true breeding dark red wheat grain plant with a true breeding white grain wheat plant, what was the phenotype of F1 generation?
a) all grains were dark red
b) all grains were white
c) 75% dark red and 25% white
d) all had light red colour
Explanation: it is because of continuous variations due to polygenic inheritance in which intermediate between two parental shade had formed
When Nilsson Elle crossed a true breeding dark red wheat grain plant with a true breeding white grain wheat plant, the phenotype of F1 generation were light red; how many shades were produced after the cross between F1 with F1?
a) two
b) three
c) four
d) seven
Explanation: dark red, moderately dark red, red, light red, pink, light pink and white
