Which of the following diseases only occurs in females?
Down syndrome
Tay-Sachs disease
Turner syndrome
Sickle cell anemia
Red-green color blindness
Which of the following diseases occurs mostly in males?
What is another name for Trisomy 21?
Which of the following diseases is characterized by the misfolding of hemoglobin?
The heterozygotes of which of the following disease have resistance to malaria?
Which of the following is caused by the enzyme deficiency?
Which of the following results in aneuploidy?
Crossing-over
Independent assortment
Translocation
Nondisjuntion
Segregation
Which of the following is characterized by the random distribution of each maternal and paternal chromosome into daughter cells?
Nondisjunction
What is it called when homologous pairs or sister chromatids fail to separate during anaphase?
What is it called when part of a chromomse breaks of and attaches to a nonhomologous chromosome?
What is it called when part of a chromosome breaks off and attaches to a homologous chromosome?
What is the probability of the phenotype of the offspring will be dominant for A and recessive for B?
0
1/4
1/2
3/4
3/16
What is the probability that the dominant phenotype will be produced by parent Aa x Aa?
What is the probability that the genotype AABb will be produced by the parents AaBb x aabb?
What is the probability that the gamete ab will be produced by the parent AaBb?
There are three alleles for blood type in humans (2n). How many different alleles may be present in the bone cell of one individual?
One
Two
Three
Six
Eight
How many different genotypes are possible form the cross Aabb x AaBb?
Four
Nine
Sixteen
How many phenotypes are possible from the cross Aabb x AaBb?
Which of the following processes creates new combinations of genes on chromosomes?
Base pair substitution
Posttranscriptional processing
A couple has six daughters. What is the probability the next child will be a daughter?
(1/2)^6
(1/2)^7
1
A couple has four children, only one of whom has sickle cell anemia. What is the probability their fifth child will be phenotypically normal?
In a fictional species of insect, eye shape is determined by a single gene with two alleles. An insect homozygous for round eyes is crossed with an insect homozygous for elongated eyes. All the F1 offspring have oval eyes. If members of the F1 generation are crossed, what percent of their offspring (F2) are expected to have round eyes?
100 percent
75 percent
50 percent
25 percent
0 percent
In drosophila, normal wings (N) are dominant to vestigial wings (n) and a grey body (G) is dominant to a black body (g). The offspring of a particular cross produced 412 flies with normal wings, and 192 flies with grey bodies and 220 flies with black bodies. Which were most likely the genotypes of the parents?
NnGg x NnGg
NnGg x NNGg
Nngg x nnGg
NnGg x NNgg
NNgg x nnGG
In drosophila, normal wings (N) are dominant to vestigial wings (n), and a grey body (G) is dominant to a black body (g). A cross between heterozygote flies and homozygote recessive flies produced 402 grey, normal-winged flies, 416 black, vestigial-winged flies, 90 black, normal winged flies, and 92 grey, vestigial winged flies. Which of the following best explains these results?
Independent assortment of homologous chromosomes
Segregation of alleles during gamete formation
Crossing-over between liked genes
Heterozygotes crossed with homozygotes are expected to have these ratios.
Some of the flies must have mated with flies that weren't part of the experiment.
Which of the following best describes the relationship between linked genes and the rate of crossing-over between them?
Two genes far apart on a chromosome will not appear to assort independently.
The distance between the genes is inversely proportional to their rate of crossing-over.
The recombination frequency is directly proportional to the distance between genes.
Two genes on different chromosomes may be linked if they are inherited together.
Chromosomes that contain sex-linked genes do not assort independently.
Human spermatogenesis produced four sperm, two with 24 chromosomes and two with 22 chromosomes. The nondisjunction event that caused this probably occurred during which phase of meiosis?
S phase
Meiosis I
Anaphase II
Interkinesis
Cytokinesis
A karyotype of a white blood cell can be used to diagnose all of the following disorders EXCEPT
Klinefelter syndrome
Chromosomal translocation
