$1.$ The Rh blood factor is a single$-$gene trait, with Rh$-$negative recessive to Rh$-$positive.$$ Two Rh$-$positive parents have a Rh$-$negative child.

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A$.$ Use appropriate genetic symbols and give the genotypes of the parents. $(2$ points$)$

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B$.$ What is the probability that their next child will be Rh$-$positive?$($Show your work$)(2$ points$)$

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C$.$ What is the probability that their next child will be Rh$-$negative?$($Show your work$)(2$ points$)$

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D$.$ If their Rh$-$negative child married a Rh$-$positive individual whose mother was Rh$-$negative, what are the expected genotypic and phenotypic ratios among their progeny? $($Show your work$)(4$ points$)$

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