Exam 9: Patterns of Inheritance

In humans,hair texture is an incompletly dominant trait.Curly hair is the homozygous dominant trait; smooth hair is homozgous recessive; wavy hair is heterozygous.If two wavy haired individuals have children what is the expected phenotype ratio?

Classification.Answer the questions in reference to the five disorders listed below. a.Turner syndrome b.PKU c.Hutchinson-Gifford progeria d.hemophilia e.Tay-Sachs -disorder that results from a missing sex chromosome

Cystic fibrosis is a recessive disorder.If a couple,each of whom is heterozygous,have children,what is the probability that they will have a child with cystic fibrosis?

Which of the following is NOT associated with Marfan syndrome?

In Tay-Sachs disease,which organelle is affected?

A bell-shaped curve of phenotypic variation is indicative of

Mendel's dihybrid crosses (but not his monohybrid crosses)showed that

Match the following letters to the number with which they best correspond. a.genotype b.heterozygous c.dihybrid cross d.pleiotropic e.codominance f.epistasis g.incomplete dominance h.syndrome i.continuous variation j.aneuploidy -experiment in which individuals heterozgous for two genes are crossed

Achondroplasia Achondroplasia is an autosomal dominant disorder,however homozygous dominant individuals do not have achondroplasia - they either die before birth or very shortly thereafter.The homozygous recessive condition is normal.A dwarf couple decide to have children.Use this information to answer the following question(s). -In the example above,what is probability that the couple will have a child with achondroplasia?

In incomplete dominance,

In a Punnett square,the letters on top of the square and on the side of the square represent

The main problem for those with cystic fibrosis involves which of the following?

In genetic analyses,researchers know that linkage of genes will introduce exceptions to the principle of

Match the following letters to the number with which they best correspond. a.genotype b.heterozygous c.dihybrid cross d.pleiotropic e.codominance f.epistasis g.incomplete dominance h.syndrome i.continuous variation j.aneuploidy -the particular alleles carried by an individual

Syndrome means

Which of the following would be the LEAST satisfactory organism for genetic research?

Why are most X-linked disorders recessive?

Match the following letters to the number with which they best correspond. a.genotype b.heterozygous c.dihybrid cross d.pleiotropic e.codominance f.epistasis g.incomplete dominance h.syndrome i.continuous variation j.aneuploidy -condition in which one allele is not fully dominant over another,so the heterozygous phenotype appears to be a blend of the two homozygous phenotypes

If a daughter expresses an X-linked recessive gene,she inherited the trait from

The ABO blood types are examples of