Question

medaka fish respond more strongly to bright mating coloration during summer conditions than during winter conditions. the number of opsins, proteins that are involved in seeing specific colors, increases in the eyes of medaka fish under summer conditions. medaka fish that lack opsins for red light do not exhibit a response to bright mating coloration. which hypothesis does this information best support? (1 point) summer conditions decrease the expression of genes that encode opsins, which enables successful mating behaviors. summer conditions increase the expression of genes that encode opsins, which enables successful mating behaviors. winter conditions decrease the frequency of mutations in opsin genes, which prevents mating behaviors from occurring. winter conditions increase the frequency of mutations in opsin genes, which prevents mating behaviors from occurring.

Explanation:

The information states that medaka fish respond more strongly to bright mating coloration in summer (when opsin number increases) and that lack of red - light opsins means no response to bright mating coloration. This implies a positive relationship between opsin presence (and likely gene expression for opsins) and mating behavior response. Summer conditions increasing opsin - encoding gene expression (as more opsins are present) would enable successful mating behaviors (since response to mating coloration is stronger in summer). The first option says summer decreases opsin - encoding gene expression which is contrary to the info (opsin number increases in summer). The winter - related options talk about mutations which are not mentioned in the given information.

Answer:

Summer conditions increase the expression of genes that encode opsins, which enables successful mating behaviors.