NEET Solved Paper 2016 Question 80
Question: In a testcross involving 𝐹1 dihybrid flies, more parental - type offspring were produced than the recombinant-type offspring. This indicates:
Options:
A) The two genes are located on two different chromosomes
B) Chromosomes failed to separate during meiosis
C) The two genes are linked and present on the same chromosome
D) Both of the characters are controlled by more than one gene
Show Answer
Answer:
Correct Answer: C
Solution:
If a plant genotype Aa Bb is crossed with aabb then Independent Assortment would result in production of 4 type of offsprings in equal proportion.
Aa Bb - gametes AB Ab aB ab
Aa bb - Gametes ab ab Ab ab
Offspring according to independent assortment
$ \begin{matrix} AaBb & Aabb & aaBb & aabb \\ \text{1:} & \text{1:} & \text{1:} & 1 \\ \text{(Parental)} & \text{(Recombinants)} & {} & \text{(Parental)} \\ \end{matrix} $
Since parental percentage is more than recombinants it is due to linkage between genes A and B.
