Maybe this will help not sure how to answer this question
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Okay let me break this down, so you have a pure red and pure white feathered chicken meaning that the chickens have homologous alleles. Overtime, as you breed the two you may get multicolored chickens but they can carry the recessive white feathers alleles (FWFW) meaning that they can still produce all white chickens and they can continuously do that over generations. Selective breeding may be negative because you may not get the desired result, you could breed for the wrong traits, other characteristics are lost and the resulting population is very similar. Less genetic variation can cause the chickens to not be resistant to problems like diseases and could fall ill.
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There is no "form" listed. I'm guessing Carbon dioxide.
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As Rosalind's acknowledgment of being perhaps one of the most wronged women in modern science, her boss, the molecular biologist Maurice Wilkins, stopped her in the 1950s. Wilkins did not accept her as the author of the discovery of the helical shape of DNA, offend Rosalind in several letters he exchanged with other scientists from the same field.
As a final destination for viruses and malaria sporozoites before injection into a vertebrate host, the mosquito salivary glands play a critical role in the transmission of pathogens. Although the specific mechanisms by which such pathogens infect mosquito salivary glands are not particularly well detailed .
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