7.4 Quizizz: Human Genetics and Pedigrees

Much of what we know about single-gene traits in humans is the result of studying

• Britain’s Royal Family.

• polygenic traits.

• genetic disorders.

• hemophilia.

What is the main difference between the carrier of a sex-linked disorder and the carrier of an autosomal disorder?

• Female carriers of an autosomal disorder pass the disorder to all offspring.

• All carriers of autosomal disorders have two dominant alleles for the disorder.

• The carrier of a sex-linked disorder is always female but does not have the disorder.

• Male carriers of a sex-linked disorder always have mothers who had the disorder.

A chart that traces the phenotypes and genotypes within a family is called a

• pedigree.

• karyotype.

• Punnett square.

• chromosome map.

A genetic disorder is traced within a family. The disorder occurs mostly in males. The gene for this disorder is most likely

• not sex-linked.

• on the X chromosome.

• an autosomal allele.

• carried only by males.

Which of the following types of genetic information can be identified easily with a karyotype?

• homologous chromosomes

• dominant traits

• exact locations of genes

• recessive alleles