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of genetics and lemperature Genetically male fish have two Z chromosomes ZZ and genetically female fish have one Z chromosome and one W chromosome ZW When fish are raised at 22 C zz fish develop into phenotypic males and ZW fish develop into phenotypic females However when fish are raised at 28 C the Z chromosome is modified denoted as Z Z W individuals develop as phenotypic males that are fertile and can pass on the Z chromosome to their offspring even when the offspring are raised at 22 C A cross between a ZW female and a Z Z male is shown in the Punnett square below Z Z Z Z Z ZZ W Z W ZW a Predict the percent of phenotypic males among the FI offspring of the cross shown in the Punnett square if the offspring are raised at 22 C b At least one Z or Z chromosome is necessary for survival of the fish A researcher crossed two fish and observed a 2 1 ratio of males to females among the offspring Based on the information identify the genotype of the male parent in the cross Describe ONE fitness cost to the female of mating with this particular male c In a population of 200 fish 125 are phenotypic males and 75 are phenotypic females Based on your prediction of males to females from question a perform a chi square test to determine if the population is due to random chance or if there is some outside force acting on the population You may either use the equation provided on the formula chart or create a table like you used in class to calculate your chi square value

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