Exam 20: Genetics and Human Inheritance

Favism is a disease in which a person cannot tolerate a certain type of bean.It is caused by an X-linked,recessive gene.If Joe has it,which statement would be true?

When one gene causes multiple effects,it is called ________.

The ability of one gene to have multiple effects on two or more aspects of the phenotype is referred to as ________.

Why might some women bodybuilders who are taking illegal steroids (testosterone-like compounds)be in greater danger of going bald than other women?

Match each definition in the first column to the correct term in the second column. -A chart showing the genetic connections among individuals in a family.

This blood-clotting problem is usually sex-linked.

Match each definition in the first column to the correct term in the second column. -The observable physical traits of an individual.

Match each definition in the first column to the correct term in the second column. -A situation in which both alleles for a certain trait produce functional proteins.

In a family both parents have freckles and widow's peak.Both of these traits are dominant: F=freckles,W=widow's peak.They have a child that has no widow's peak and no freckles.Which one is a possible dihybrid genotype of their child?

An autosomal recessive disorder in which a young person produces thick mucus and excessively salty sweat and has serious respiratory problems is ________.

Often in complete dominance,the recessive allele codes for a nonfunctional ________.

In a family both parents have freckles and widow's peak.Both of these traits are dominant: F=freckles,W=widow's peak.What is the correct phenotypic ratio of the next generation if the parents were heterozygous? The order of the genotypes is: Freckled with widow's peak: Freckled,straight hairline: no freckles with widow's peak: no freckles,straight hairline.

Albinism is due to the inability to make ________.

Which is a condition caused by a sex-linked inheritance in which a male child will bleed extensively because he lacks the physiological properties to form a blood clot?

Albinism is an example of ________.

Individuals that carry different alleles for a given gene are considered ________ for those alleles.

Duplication can be advantageous for evolution,because while the correctly functioning DNA segment remains intact,duplication also provides new copies of genes that can be altered to new functions.Unfortunately,duplication can also result in human genetic disorders.Please provide an example of a human genetic disorder that occurs when certain DNA sequences are duplicated.

Match each definition in the first column to the correct term in the second column. -A condition in which someone has different alleles for the same gene.

The presence of the ________ chromosome means that a person will probably appear to be male.

A genetic condition in which abnormal hemoglobin form,red blood cells become crescent shaped,and cells get stuck together is called ________.