Describe the inheritance and expression of cystic fibrosis, Tay-Sachs disease and sickle-cell anemia.

I didn't understand what the question meant by "expression." Please help!

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  1. Thank you for using the Jiskha Homework Help Forum. When you encounter a word, don't forget a good dictionary where you can look for the various meanings:

    Main Entry: ex·pres·sion
    Pronunciation: ik-'spre-sh&n
    Function: noun
    Date: 15th century
    1 a : an act, process, or instance of representing in a medium (as words) : UTTERANCE <freedom of expression> b (1) : something that manifests, embodies, or symbolizes something else <this gift is an expression of my admiration for you> (2) : a significant word or phrase (3) : a mathematical or logical symbol or a meaningful combination of symbols (4) : the detectable effect of a gene; also : EXPRESSIVITY 1
    2 a : a mode, means, or use of significant representation or symbolism; especially : felicitous or vivid indication or depiction of mood or sentiment <read the poem with expression> b (1) : the quality or fact of being expressive (2) : facial aspect or vocal intonation as indicative of feeling
    3 : an act or product of pressing out
    - ex·pres·sion·al /-'spresh-n&l, -'spre-sh&-n&l/ adjective

    In other words, how is manifested, shown?

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