How can a presynaptic neuron increase the intensity of the signal it is transmitting?
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Answer:
I believe the options are:
A) The diagram shows crossing over. Crossing over increases the genetic variation of the gametes produced in meiosis, by allowing for different allele combinations than present in the parents. This results in greater diversity in the offspring produced.
B) The diagram shows a chromosome mutation called translocation. Translocation introduces new traits into the gene pool of the gamete by trading genes between nonhomologous chromosomes. This results in greater diversity in the offspring produced.
C) The diagram shows crossing over. Crossing over introduces new traits into the gene pool of the gamete by trading genes between homologous chromosomes. This results in the formation of more diverse gametes.
D) The diagram shows a chromosome mutation called inversion. In inversion, a segment of a chromosome is reversed end to end. Inversion rearranges the genes on a chromosome, providing more diverse gametes.
The correct choice is: A) The diagram shows crossing over. Crossing over increases the genetic variation of the gametes produced in meiosis, by allowing for different allele combinations than present in the parents. This results in greater diversity in the offspring produced.
Explanation:
Crossing Over:
- Crossing over occurs in the Prophase 1 of Meiosis 1.
- By definition, it is the exchange of chromosomal segments between non-sister chromatids of homologous chromosomes.
- Through exchange of genetic segments, crossing over introduces genetic variations in the gametes.
- Genetically variant gametes fuse to produce an individual that varies in characteristics as compared to the parents.
