Question

An individual has the chromosomes below where the dot represents the centromere: NOP.QRSTU NRQ.POSTU If a crossover event occurs between the O and P loci, what is the shortest chromosome formed? Enter your answer with no spaces between the loci and use a period as the centromere.

Answer 1

ANSWER- An individual has the chromosomes NOP.QRSTU and NRQ.POSTU.If a crossover event occurs between the O and P loci, the shortest chromosome formed is NOP.QRN.

Explanation- Cross over or crossing over is defines as the exchange of chromosomal segment between non-sister chromatids of homologous chromosomes which can result in the formation of short and long chromosomes.Crossing over occurs in meiosis to generate variation and in turn gentic diversity in population.

• The cross over event occurs between O and P loci which means that the arm of chromosome join from O of one chromosome to P of another chromosome with the remaining sequence and centromere at its position in the reverse order resulting in the formation of a shortest chromosome which is NOP.QRN. Formation of the shortest chromosome is shown in the image attached.