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Organogenesis (embryo)- These three parts of the Primitive Gut Tube we call theour guts!
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- All animals with eyes or eyespots that have been studied so far share a gene in common. When mutated, the gene Pax-6 causes the lack of eyes in fruit flies, tiny eyes in mice, and missing irises (and other eye parts) in humans. The sequence of Pax-6 in humans and mice is identical. There are so few sequence differences with fruit fly Pax-6 that the human/mouse version can cause eye formation in eyeless fruit flies, even though vertebrates and invertebrates last shared a common ancestor more than 500 million years ago. The appearance of Pax-6 in all animals with eyes can be explained in multiple ways.Based on the information given, which explanation is most likely?
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- 22. Which characteristic would not increase or decrease the fitness of the organisms that possess it?A) Certain fruit flies in a population carry genes that increase their ability to survive longer without food thanindividuals that do not possess that gene.B) Certain mice in a population carry genes that cause their fur to be darker than the fur of other individuals that donot possess those genes.C) Certain male birds in a population carry genes that increase the size of their tail relative to the size of the tails ofthe male individuals that do not possess those genes.D) Certain sterile mules in a population carry genes that allow them to carry heavier loads than other sterileindividuals that do not possess those genes.E) Certain humans in a population carry genes that cause their eyesight to deteriorate at a more rapid rate thanother individuals who do not possess those genes.