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- 4) Jackie and Max both have a widow’s peak (dominant trait). Can they have a child without a widow’s peak? Explain.A woman gives birth to monozygotic twins. One boy has a normal genotype (46, XY), but the other boy has trisomy 13 (47, +13). What eventsand in what sequenceled to this situation?Tay Sachs disease is a recessive lethal. Abnormally shortened fingers are the heterozygous form of a dominant lethal. What phenotypes would you expect among teen-age children from parents who are heterozygous for both traits?..
- When examining a human pedigree, what features do you look forto distinguish between X-linked recessive inheritance and autosomal recessive inheritance? How would you distinguish X-linkeddominant inheritance from autosomal dominant inheritance in ahuman pedigree?A husband and wife have normal vision, although both of theirfathers are red–green color-blind, inherited as an X-linked recessivecondition. What is the probability that their first child willbe (a) a normal son, (b) a normal daughter, (c) a color-blind son,(d) a color-blind daughter?1. What are the characteristics of X-linked recessive inheritance? 2. Why does a son never inherit his father’s defective X chromosome? 3. What is required for a woman to display a sex-linked recessive trait?
- In mice, dwarfism is caused by an X-linked recessive allele, and pink coat is caused by an autosomal dominantallele (coats are normally brownish). If a dwarf femalefrom a pure line is crossed with a pink male from a pureline, what will be the phenotypic ratios in the F1 and F2 ineach sex? (Invent and define your own gene symbols.)Do the symbols A and a have anything to do with dominance and recessiveness?1. y-linked recessive 2. autosomal recessive 3. autosomal dominant 4. X-linked dominant 5. Pleiotrophic 6. X-linked recessive
- When crossing two fruit flies with red eyes, which is a dominant trait, half of the male offspring are born with white eyes, but none of the females are. What is this an example of? A. an autosomal recessive trait B. an autosomal dominant trait C. an X-linked recessive trait D. an X-linked dominant traitMr. and Mrs. Jones have six children. Three of them have attached earlobes (recessive) like their father, and the other three have free earlobes like their mother. What are the genotypes of Mr. and Mrs. Jones and of their numerous offspring?So the question is asking to construct a pedigree, but I am extremely confused on how to find the genotypes of the sons and daughters. The trait is x-linked recessive.
