A&P II Chapter 29 Lab

If the probability of an event occurring is 50%, what is the probability of that event occurring 5 times in a row?

1/32

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

100%

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?

100%; all are Ss

How many autosomes pairs do humans have?

22

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 ________.

50%

ABO blood types are determined by three alleles designated IA, IB, and i. A person with alleles IA and i will have the blood type

A

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?

DD or Dd

A heterozygous individual will have two of the same alleles in a chromosome pair

False

Males are more likely to inherit hemophilia because it is a result of receiving the sex-linked gene from the father.

False

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

It is frequently seen in women.

What is true about the sex chromosomes?

Possession of the Y chromosome determines maleness.

A __________ is used to demonstrate the genotypes of potential offspring that might result from mating.

Punnett square

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?

The patient has sickle-cell trait.

The Y chromosome is only about one-third the size of the X chromosome, and it lacks many of the genes that are found on the X chromosome.

True

The inheritance of ABO blood type involves three possible alleles.

True

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?

Ww and Ww

Possession of the __________ chromosome determines maleness.

Y

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 ________.

a homologous pair

Genes that code for the same genetic trait are __________.

alleles

Genotype is ________.

an individual's actual genetic makeup

Autosomes are pairs of chromosomes that contain genes for determining ________.

body characteristics

Inheritance of ABO blood types is an example of ________.

codominance

If an individual has alleles for a particular trait that differ in their expression, and one of the alleles always exerts its effect, the individual is said to express the ________ gene.

dominant

Incomplete dominance occurs when ________.

each of the alleles is partially expressed

Alleles are ________.

genes coding for the same trait on a pair of homologous chromosomes

If a person is homozygous for a particular trait, the alleles for that trait ________.

have the same expression

If the genotype of an individual contains alleles for a particular trait that differ in their expression, the individual is said to be ________ for that trait.

heterozygous

A condition known as __________ can result when heterozygous individuals exhibit a phenotype intermediate between homozygous individuals, and both alleles are expressed in the offspring.

incomplete dominance

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

incomplete dominance

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

karyotype

The physical appearance of an individual's genetic makeup, the characteristics that we can see, is that person's __________.

phenotype

The allele with less potency, which is present but NOT expressed, is the __________ allele.

recessive

Genes present only on the X chromosome are called ________.

sex-linked genes

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).

the person is tall

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?

trait 50%; anemia 50%