Exam 29: Heredity

Among members of the Fuzzy Wuzzy tribe, we will consider two pairs of genes: F = fuzzy hair vs. f = straight hair, and T long hair vs. t = short hair. A homozygous, straight- shorthaired male marries a homozygous, fuzzy- longhaired female (P1 generation). Their offspring (the F1 generation) intermarry and produce progeny (second generation) of four types: fuzzy- longhaired, fuzzy- shorthaired, straight- longhaired, and straight- shorthaired. The results follow a standard dihybrid pattern. -The second- generation phenotypes would follow what ratio? (Pair the number with a phenotype in each case.)

Huntington's disease involves _ .

Sex chromosomes of a normal male are .

For which of the following are newborn infants not routinely screened at birth?

Figure 29.1 -Gene mutations in the sex chromosomes of the human would tend to become visibly expressed )

A 40- year- old pregnant woman is concerned about possible genetic defects in her unborn fetus. Her physician recommends prenatal testing and advises her of two methods. Compare and contrast amniocentesis with chorionic villus sampling relative to the time each can be performed, and the relative advantages and disadvantages of each.

The expression of all physical traits is strictly due to the inheritance of specific genes.

An individual who is heterozygous for a particular trait, yet expresses both alleles of that trait, is an example of _ _.

Among members of the Fuzzy Wuzzy tribe, we will consider two pairs of genes: F = fuzzy hair vs. f = straight hair, and T = long hair vs. t = short hair. A homozygous, straight- shorthaired male marries a homozygous, fuzzy- longhaired female (P1 generation). Their offspring (the F1 generation) intermarry and produce progeny (second generation) of four types: fuzzy- longhaired, fuzzy- shorthaired, straight- longhaired, and straight- shorthaired. The results follow a standard dihybrid pattern. -How might carriers of deleterious genes be recognized?

Figure 29.2 Use Figure 29.2 to answer the following: -Are there any afflicted females?

It is possible for a baby to have type O blood if neither parent is type O.

Small RNAs control the timing of programmed cell death during development.

Hemophilia is an X- linked condition caused by a recessive gene.

Figure 29.1 -Given the information in Figure 29.1, what would the genotype ratio be for the offspring?

Figure 29.1 -Given the information in Figure 29.1, what is the phenotype ratio (assuming C is dominant and there is no incomplete dominance)?

Among members of the Fuzzy Wuzzy tribe, we will consider two pairs of genes: F = fuzzy hair vs. f = straight hair, and T = long hair vs. t = short hair. A homozygous, straight- shorthaired male marries a homozygous, fuzzy- longhaired female (P1 generation). Their offspring (the F1 generation) intermarry and produce progeny (second generation) of four types: fuzzy- longhaired, fuzzy- shorthaired, straight- longhaired, and straight- shorthaired. The results follow a standard dihybrid pattern. -The second- generation types would have what phenotypes?

Parents are informed after an amniocentesis that the results show a baby who has an extra number 21 chromosome. Should there be concern and what might the problem be?

Figure 29.2 Use Figure 29.2 to answer the following: -Is the trait sex- linked?

A nurse is providing genetic counseling to a couple who both have the sickle- cell anemia trait, but not the disease. The couple is trying to decide whether or not to have a child. What is the possibility that a child would inherit the disease? What is one reason they might consider not having a child?

Among members of the Fuzzy Wuzzy tribe, we will consider two pairs of genes: F = fuzzy hair vs. f = straight hair, and T long hair vs. t = short hair. A homozygous, straight- shorthaired male marries a homozygous, fuzzy- longhaired female (P1 generation). Their offspring (the F1 generation) intermarry and produce progeny (second generation) of four types: fuzzy- longhaired, fuzzy- shorthaired, straight- longhaired, and straight- shorthaired. The results follow a standard dihybrid pattern. -What were the genotypes of the parental (P1) individuals?