Question

the diagram shows the crossing over of two homologous chromosomes. what would be the resultant gene combinations?

Explanation:

Step1: Understand crossing - over

Crossing - over occurs between homologous chromosomes. During this process, segments of chromatids are exchanged.

Step2: Analyze gene transfer

In the given diagram, the black chromosome has genes \(A\), \(B\), \(C\) and the grey has \(a\), \(b\), \(c\). After crossing - over, a segment of the black chromosome (with \(C\)) swaps with a segment of the grey chromosome (with \(c\)). So, one chromosome will have \(A\), \(B\), \(c\) (black chromosome with the swapped \(c\)) and the other will have \(a\), \(b\), \(C\) (grey chromosome with the swapped \(C\)). This is consistent with the first option (assuming the first option in the user - provided image has the correct gene combination \(A\), \(B\), \(c\) and \(a\), \(b\), \(C\) after the visual crossing - over as described).

Answer:

First option (assuming the first option in the user - provided image corresponds to the correct gene combination after crossing - over as per the described process).