In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?

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Cyanobacteria are

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Prokaryotic cells divide by a process known as

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The absolute maximum of  on the interval [0, 4] is.

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Which hypersensitivity reactions are T cell mediated? 

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 The mutations of RAS that make it oncogenic by