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Western University
Biology 3466B
Yolanda Morbey

There is a type of lizard that only has a female sex. They don’t need sperm cells to reproduce. Their offspring are clones of their mother. The fish with black spots are parasitized and had asexual reproduction, and another type of fish didn’t have any spots/not parasitized and had sexual reproduction when they were all living in the same environment. Asexual fish are an easy target for short lived, fast evolving parasites. While, sexual fish are a moving target and each has a new combination from their parents’ genes. For parasites, each one of them is unique and individual challenge and slows down transmission of parasites through the population. Sexual reproduction is the best defence from rapidly evolving enemies. A draught occurred, and after the population returned. But parasites were affecting the sexual population as well. Found out that sexual species, during the process of re-colonization, had lost their genetic variation, making them inbred. They resembled each other, and they outnumbered the true clones, so they were targeted by the parasites. So the researcher added fish from a lower pool, where fish had genetic variation. Then parasite level dropped to previous years. In nature, ornaments are usually only on males – to attract females. Males – competition Females – choice – they’re choosy because they put in so much effort. Peacocks – fancier their feathers, more likely for females to choose them. Offspring had a better ch
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