Question

Recombination has occurred between the chromosome segments shown in Figure Q6-61. The genes A and B, and the recessive alleles a and b, are used as markers on the maternal and paternal chromosomes, respectively. After alignment and homologous recombination, the specific arrangements of A, B, a, and b have changed.

Which of the choices below correctly indicates the gene combination from the replication products of the maternal chromosome?
(a) AB and aB
(b) ab and Ab
(c) AB and Ab
(d) aB and Ab

Answer 1

The correct gene combination from the maternal chromosome after recombination is AB and aB, as homologous recombination during meiosis allows for the exchange and shuffling of alleles between chromosomes. Option a is correct.

Step-by-step explanation:

In the context of the question about homologous recombination during meiosis, the correct gene combination from the replication products of the maternal chromosome is AB and aB. This is due to the process called recombination, or crossover, where homologous chromosomes align during meiosis and exchange segments of genetic material.

The result of this recombination is the shuffling of alleles between the maternal and paternal chromosomes, creating recombinant chromosomes that have a new combination of alleles derived from both parents.