Principle Of Inheritance And Variation Question 35
Question: Assertion : Complementary genes are nonallelic B genes. Reason : Complementary genes interact to produce a completely new traits.
Options:
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
Show Answer
Answer:
Correct Answer: B
Solution:
Complementary genes are those nonallelic genes which independently show a similar effect but produces a new trait when present together in the dominant form.
W.
Bateson and R.C.
Punnett observed that, when two white flowered varieties of sweet pea, Lathyrus odoratus were crossed, $ F_1 $ progeny had coloured flowers.
When $ F_1 $ progeny obtained from $ F_1 $ was classified, plants with coloured flowers and those with white flowers were obtained in 9 : 7 ratio.
The two dominants are brought together in $ F_1 $ generation and therefore coloured flowers are produced.
BETA
