NEET 2016 · Class 12

Principles of Inheritance and Variation

In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates :

  1. (A)Both of the characters are controlled by more than one gene.
  2. (B)The two genes are located on two different chromosomes.
  3. (C)Chromosomes failed to separate during meiosis.
  4. (D)The two genes are linked and present on the same chromosome

The NCERT line that answers it

Verbatim line

Morgan and his group knew that the genes were located on the X chromosome (Section 4.4) and saw quickly that when the two genes in a dihybrid cross were situated on the same chromosome, the proportion of parental gene combinations were much higher than the non-parental type.

Chapter
Principles of Inheritance and Variation
Section
4.3.3 Linkage and Recombination
Page
16
Words matched
47 of 47

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that when two genes in a dihybrid cross are on the same chromosome, parental combinations are much higher than non-parental types, which directly matches the MCQ scenario and conclusively proves gene linkage.

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