Exam 29: Genetics and Human Inheritance

Why are pedigrees useful to track genetic disorders?

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

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

Match each definition to the correct term -The expression of the trait in heterozygous individuals is somewhere between the expression of the trait in the homozygous recessive and homozygous dominant individual.

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

A cross involving one gene between two heterozygous parents is called a(n) ________.

What are the advantages and disadvantages of chronic villus sampling (CVS) in comparison to amniocentesis? Why would one conduct CVS or amniocentesis following one of the non-invasive blood tests done on the mother?

What are the differences between complete dominance and codominance?

A genetic cross between two individuals who are heterozygous for two traits of interest is called a(n) ________.

Paul was an orphan found wandering a city street when he was 2 years old. At age 52, he began to experience muscle spasms and was having difficulty walking. Which of the following genetic disorders is most probable?

Match each definition to the correct term -The cause of cri-du-chat syndrome.

Thalassemia is a very serious disorder that affects hemoglobin. It is caused by an autosomal recessive gene. If both a woman and a man are carriers, then what is the chance that they will have a child with the disease?

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

If two genes are on the same chromosomes and we look at a dihybrid cross between two heterozygous parents, will we see a pattern of 9:3:3:1? Why or why not?

The principle that states that different homologous chromosomes travel randomly to different ends of the cell is ________.

Specific segments of DNA that are the functional units of inheritance are called ________.

Why is Duchenne muscular dystrophy less common in females than males?

If the two parents are each heterozygous for widow's peak and having freckles, what is the chance that any of their children will have the same phenotype?

Emery had no freckles. His wife, Marguerite, was clearly freckled but known to be heterozygous for the gene. Predict the chance that any one of their children will have freckles.

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.