Observe the given figure of cross A and cross B and select the correct statement.
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Always remember:
Low recombination = Strong linkage
High recombination = Weak linkage
This is one of the most frequently tested concepts from Morgan's linkage experiments.
In cross A strength of linkage between genes Y and W is higher than cross B genes W and m
In cross A strength of linkage between genes Y and W is lesser than the cross B genes W and m
Cross A genes Y and W and cross B genes W and m have the same strength of linkage
Percentage of recombination produced in cross A is higher than cross B
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The Correct Option isA
Solution and Explanation
Concept:
Linkage refers to the tendency of genes located on the same chromosome to be inherited together. The closer two genes are on a chromosome, the stronger the linkage between them and the lower the frequency of recombination.
Morgan's experiments in Drosophila established that recombination frequency is inversely proportional to linkage strength.
Step 1: Recall the relationship between linkage and recombination.
Genes located very close together show:
\[
\text{Strong linkage}
\]
and therefore produce
\[
\text{Low recombination frequency}
\]
Step 2: Understand the significance of recombination percentage.
If the recombination percentage is small, linkage is strong.
If the recombination percentage is large, linkage is weak.
Thus,
\[
\text{Linkage Strength}
\propto
\frac{1}{\text{Recombination Frequency}}
\]
Step 3: Compare the values shown in Cross A and Cross B.
The answer depends entirely on the recombination percentages shown in the figure.
Higher recombination means weaker linkage.
Lower recombination means stronger linkage.
Step 4: Choose the correct statement accordingly.
Since the actual figure is not visible here, the correct option can only be determined after comparing the recombination percentages in Cross A and Cross B.
