During meiosis, chromosomes that are duplicated homologs pair up and crossover. Crossover is the exchange of genetic material between these homologs and result in recombinant chromosomes. This happens as matching regions of matched chromosomes break and reconnect to the other chromosome. At least one crossover per chromosome should occur so that the homologous pair stay together until metaphase I.
A crossover has occurred in the bivalent shown below:
What is the outcome of this single-crossover event?
If a second crossover occurs somewhere between A and C, explain which two chromatids it would involve and where it occurs (i.e. between which two genes to produce the types of chromosomes shown here:
A. A B C, A b C, a B c, and a b c
B. A b c, A b c, a B C, and a B C
C. A B c, A b c, a B C, and a b C
D. A B C, A B C, a b c, and a b c
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Extensions to Mendel concept. You can view video lessons to learn Extensions to Mendel. Or if you need more Extensions to Mendel practice, you can also practice Extensions to Mendel practice problems.
What professor is this problem relevant for?
Based on our data, we think this problem is relevant for Professor Yeargain's class at UCF.