Which of the following environmental factor/s also influence the amount of grain colour in wheat along with three genes?
a) light
b) water
c) nutrients
d) all of these
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) human skin colour
Human skin shows.…variation in colour.
a) continuous
b) discontinuous
c) both a and b
d) none of them
Explanation: from pure white to dark brown with no distinct differences
When a single gene has multiple phenotypic effects, it is known as……..
a) complete dominance
b) pleiotropy
c) incomplete dominance
d) epistasis
Explanation: Pleiotropy refers to disorders where multiple, seemingly unrelated organ systems are affected. For example, one individual in a pedigree may exhibit cardiac arrhythmia, whereas another individual with the same disorder in either the same or different pedigree shows muscle weakness and deafness
How many different
skin colour phenotypes are found in human population all over the world?
a) two
b) three
c) four
d) seven
Explanation: dark brown, moderately dark brown, brown, light brown, pinkish brown, whitish brown and pure white
Skin colour in human is largely determined by the amount of ……..
a) dopamine
b) melatonin
c) melanin
d) tyrosine
Explanation: Melanin is a substance in your body that produces hair, eye and skin pigmentation. The more melanin you produce, the darker your eyes, hair and skin will be.
