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Phenylketonuria is an inherited disease caused by a recessive autosomal allele. If a woman and her husband are both carriers, what is the probability that.

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Presentation on theme: "Phenylketonuria is an inherited disease caused by a recessive autosomal allele. If a woman and her husband are both carriers, what is the probability that."— Presentation transcript:

1 Phenylketonuria is an inherited disease caused by a recessive autosomal allele. If a woman and her husband are both carriers, what is the probability that their first child will be a phenotypically normal girl? 1.1/4 2.1/ /16 5.3/8

2 Phenylketonuria is an inherited disease caused by a recessive autosomal allele. If a woman and her husband are both carriers, what is the probability that their first child will be a phenotypically normal girl? 1.1/4 2.1/ /16 5.3/8 -- 3/4 healthy x 1/2 girl.

3 Assuming independent assortment for all gene pairs, what is the probability that the following parents, AABbCc  AaBbCc, will produce an AaBbCc offspring? 1.1/2 2.1/16 3.1/8 4.3/4 5.9/16

4 Assuming independent assortment for all gene pairs, what is the probability that the following parents, AABbCc  AaBbCc, will produce an AaBbCc offspring? 1.1/2 2.1/16 3.1/8 4.3/4 5.9/16

5 A sexually reproducing organism is heterozygous for two genes located on different chromosomes, one for ear shape and one for toe length. Its genotype is AaBb. Which of the following genotypes is most probable in a gamete from this organism? 1.AB 2.AaBb 3.Aa 4.Bb 5.A

6 A sexually reproducing organism is heterozygous for two genes located on different chromosomes, one for ear shape and one for toe length. Its genotype is AaBb. Which of the following genotypes is most probable in a gamete from this organism? 1.AB 2.AaBb 3.Aa 4.Bb 5.A

7 Pseudohypertrophic muscular dystrophy is a human disorder that causes gradual deterioration of the muscles. It is seen only in boys born to apparently normal parents and usually results in death in the early teens. It is likely that this gene is ______ and ______. 1.recessive; sex-linked 2.dominant; sex-linked 3.recessive; autosomal (not sex-linked) 4.codominant; sex-linked 5.incompletely dominant; autosomal (not sex-linked)

8 Pseudohypertrophic muscular dystrophy is a human disorder that causes gradual deterioration of the muscles. It is seen only in boys born to apparently normal parents and usually results in death in the early teens. It is likely that this gene is ______ and ______. 1.recessive; sex-linked 2.dominant; sex-linked 3.recessive; autosomal (not sex-linked) 4.codominant; sex-linked 5.incompletely dominant; autosomal (not sex-linked)

9 Whenever either or both gene A or gene B is present, red color is produced. A cross of AaBb  AaBb would be expected to yield how many red offspring out of 16? Assume the genes are not linked

10 Whenever either or both allele A or allele B is present, red color is produced. A cross of AaBb  AaBb would be expected to yield how many red offspring out of 16? Assume the genes are not linked


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