Based on the classic experiments of Creighton and McClintock with maize,crossing over involves a physical exchange between chromatids.What particular chromosomal characteristic allowed their experiments to succeed?
A)a missing chromosome
B)a chromosome with a unique cytological marker
C)three chromosomes with identical structure
D)colored bands along the lengths of a chromosome
E)an extra chromosome

Question

Quizplus · Accepted Answer

The presence of a unique cytological marker on a chromosome allowed Creighton and McClintock to track the physical exchange between chromatids during crossing over.

Based on the Classic Experiments of Creighton and McClintock with Maize,crossing