Thyroid disease causes dry eyes. Puffiness of the lids, swelling, bulging eyeballs, double vision, and pain when moving the eyes are all symptoms of this ailment, which an eye doctor will recognize and refer you to the appropriate health care provider for diagnosis and treatment.
Report Abuse. asexual reproduction is simply cloning-an exact copy of the single parent genes, while sexual reproduction allows a mixture of alleles creating more variation. Source(s): i am a bio major and tutor.bio girl Â· 7 years ago.exual reproduction on the other hand involves the mating of two half cells of similar genetic code but not the same. The source of the two half cells are two different living things with different codes. Hence you have more variation in sexual reproduction vs asexual. Know-it-all Â· 7 years ago.
5.4.6 Explain how sexual reproduction promotes variation in a species. Sexual reproduction is important for promoting variation as even though mutations form new genes or alleles, sexual reproduction forms a new combination of alleles. There are two stages in sexual reproduction that promote variation in a species. The first one is during meiosis during which a large variety of genetically different gametes are produced by each individual. The second stage is fertilisation. Here, alleles from two different individuals are brought together to form one new individual.