Exam 45: Principles of Heredity

The inheritance of sickle cell anemia involves incomplete dominance. (S determines normal hemoglobin, it is dominant; s is the sickle cell gene). A homozygous recessive person has sickle cell anemia. A heterozygous person has the sickle cell trait. If parental genotypes are SS and ss, what is the probability of offspring having the sickle cell trait?

Predict the phenotype of a particular individual if the genotype of both parents is TT (T determines tallness, it is dominant; t determines dwarfism, it is recessive).

How many autosomes pairs do humans have?

Alleles are _.

Genotype is _.

A pair of chromosomes, one from the egg and one from the sperm, that carry complete (or nearly complete) genetic instructions for the same traits are called _.

You notice that both of your parents have a widow's peak that is determined by the dominant allele W. You however, have a straight hairline, which is a homozygous recessive condition (ww). What are the possible genotypes of your parents?

Genes present only on the X chromosome are called _.

If white flowers are crossed with red flowers and the resulting plants have pink flowers, that condition is known as .

Inheritance of ABO blood types is an example of .

The genes for color blindness are sex-linked and recessive. What is not true about the expression of color blindness?

The probability of a certain event occurring is defined as: P = number of specific events/total number of events. If an event happens one out of every two times its probability is _.

What is true about the sex chromosomes?

Incomplete dominance occurs when .

What is the probability of a male having color blindness if his X chromosome carries the c allele? (He is Xc. XC determines normal color vision, it is dominant. Xc determines color blindness.)

If the parental genotypes for sickle cell anemia/trait are Ss and ss, what is the probability of offspring having the sickle cell trait? If there is some probability of offspring having sickle cell anemia, what is that probability?

A complement of an individual's chromosomes displayed as homologous pairs is called the .

You have performed electrophoresis on a sample of normal hemoglobin (HbA), sickle-cell hemoglobin (HbS), a mixture containing HbA + HbS, and a sample of hemoglobin from a patient. The patient sample shows 2 bands, one at the same distance as the HbA band and one at the same distance as the HbS band. What is true about your patient?

You observe that your friend has dimples. Dimples result from the presence of the dominant gene D; absence of dimples is a homozygous recessive condition (dd). What genotype or genotypes might your friend have?

Autosomes are pairs of chromosomes that contain genes for determining .