Exam 4: Pedigree Analysis in Human Genetics

Individuals with Marfan syndrome experience an eyesight problem called ____________________.

The variable phenotypic expression shown in camptodactyly results from the interaction of ____________________ and ________________factors.

The chance of a child having albinism when both of his parents are heterozygous for the disorder is ____ percent.

Cytoplasmic organelles that convert energy from food molecules in ATP and are transmitted from mothers to all their children through the cytoplasm of the egg are called ____________________.

If a man expresses an X-linked recessive trait,his ____________________ was either homozygous or heterozygous for the trait.

Genetic diseases transmitted only by a mother to both sons and daughters result from ____________________ genes.

A trait shows ____ if the phenotype of that trait is present in less than 100% of those with the related genotype.

If a pedigree analysis suggests that an autosomal or X-linked inheritance pattern is equally likely,then additional genetic testing is needed to identify the pattern of inheritance.

Approximately ____ Y-linked genes have been discovered.

In autosomal dominant inheritance,____.

Mitochondrial gene defects most often affect the ____________________ and the ____________________.

The frequency of heterozygotes for cystic fibrosis shows ethnic variations.

The gene responsible for Marfan syndrome encodes a protein associated with ____.

A marriage between two related individuals,such as first cousins,is called ____________________.

A pedigree is always able to provide enough information to rule out all but one possible pattern of inheritance.

The probability that a disease phenotype will appear when a disease-related genotype is present is called ____________________.

The basic method of genetic analysis in humans requires a(n)____________________ of several generations.

One characteristic of an autosomal dominant trait is that ____.

Most of those affected with an autosomal dominant genetic disorder are homozygous for that trait.

When affected males produce all affected daughters and no affected sons,the pattern of inheritance is likely to be ____________________.