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Which is true about a testcross? A.) It is mating between two hybrid individuals B.) It is mating between a hybrid individual and a homozygous recessive individual C.) It is a mating between a homozygous dominant individual and a homozygous recessive individual D.) It is mating to determine which individual is homozygous recessive E.) It is a mating between an individual of unknown genotype and a homozygous recessive individual

E. It is a mating between an individual of unknown genotype and a homozygous recessive individual

All are true of crossover EXCEPT: A. It normally occurs between sister chromatids B. It is the site of chiasma C. It is responsible for linked genes being inherited separately D. It cannot occur between sex chromosomes in human males E. It is a common event

A. It normally occurs between sister chromatids

A round watermelon is crossed with a long watermelon and all the offspring are oval. If two oval watermelons are crossed, what is the percent of watermelons that will be round? A.0 B. 25% C. 50% D. 75% E. 100%

B. 25%

In peas, the trait for tall plants is dominant (T) and the trait for short plants is recessive (t). The trait for yellow seeds is dominant (Y) and the trait for green seeds is recessive (y). A cross between two plants results in 292 tall yellow plants and 103 short green plants. Which of the following are most likely to be the genotypes of the parents? A. TtYY x Ttyy B. TTYy xTTYy C. TTyy x TTYy D. TtYy x TtYy E. TtYy x TTYy

D. TtYy x TtYy

A child is born with blood type O. All of the following could the blood type of the parents EXCEPT A.A and B B. A and A C. O and O D. AB and O E. A and O

D. AB and O

ABCDEF -> ABEDCF A rearrangement in the linear sequence of genes as shown in the diagram above is known as a/an A. Translocation B. Deletion C. Addition D. Polyploidy E. Inversion

E. Inversion

The expression of both alleles for a trait in a hybrid individual is A. Pleiotropy B. Epistasis C. Codominance D. Complementation E. Incomplete Dominance

C. Codominance

How many autosomes does the human male normally have? A. 1 B. 2 C. 22 D. 23 E. 44

E. 44

Assume that two genes, A and B, are not linked. If the probability of allele A being in a gamete is ½ and the probability of allele B being in a gamete is 1/2, then the probability of BOTH A and B being in the same gamete is A. 1/2 B. 1/4 C. 1 D. 1/8 E. 0.5

B. 1/4

In one strain of mice, fur color ranges from white to darkest brown with every shade of brown in between. This pattern of inheritance for fur color is probably controlled by A. Multiple genes B. A single gene with many alleles C. Pleiotropy D. One gene with hundreds of incidences of crossover E. incomplete dominance

A. Multiple Genes

Two traits, A and B, are linked, but they are not always inherited together. The most likely reason is A. they are not really on the same chromosome B. they are not sex-linked C. they are on the same chromosome but are far apart D. they are close together on the same chromosome E. none of the above is correct

C. They are on the same chromosome but are far apart

A man who has a sex-linked allele will pass it on A. All of his daughters B. All of sons C. ½ of his daughters D. ½ of sons E. all of his children

A. All of his daughters

In garden peas, tall is dominant to short. If you crossed tall plants to short plants and found that half of the offspring were tall and half were short, what would you expect the genotypes of the parents to have been? A.TT x TT B. TT x Tt C. Tt x Tt D. Tt x tt E. tt x tt

D. Tt x tt

Assume that a human couple has five daughters. What is the probability that their fifth child will also be a girl? A. 0% B. 25% C. 50% D. 75% E. 100%

C. 50%

Which of the following is true of alleles found on the X chromosome? A. There aren’t alleles on the X chromosome B. They are inherited unequally in males and females C. They are inherited the same way autosomal dominants are inherited D. They are inherited equally in males and females E. They are inherited only in females

B. They are inherited unequally in males and females

How many chromosomes will be in a somatic cell of an animal with a single trisomy if n=14? A. 14 B. 28 C. 29 D. 46 E. Can’t tell from the data

C. 29

How many chromosomes will be in a triploid cell if an animal is n=14? A. 14 B. 28 C. 23 D. 42 E. 46

D. 42

Which of the following is a picture of the chromosomes in a cell? A. Autosome B. Amniocentesis C. Chorionic Villus Sample D. Karyotype E. Pedigree

D. Karyotype

Which of the following human genetic disease is X-linked? A. Hemophilia B. Down Syndrome C. Fragile X Syndrome D. Klinefelter Syndrome E. Turners syndrome

A. Hemophilia

Which of the following causes a trisomy? A.Duplication B. Inversion C. Linkage D. Nondisjunction E. Translocation

D. Nondisjunction

Which type of disease is responsible for a cross involving the following genotypes AA x aa resulting in an individual with a genetic disease. A. Autosomal dominant B. Autosomal recessive C. Incomplete Dominance D. Complete Dominance E. Multiple Alleles F. Polygenic Inheritance

A. Autosomal Dominant

The parents both have the genotype Aa. The probability is that 25% of their offspring will have a genetic disease. What type of disease is this? A. Autosomal dominant B. Autosomal recessive C. Incomplete Dominance D. Complete Dominance E. Multiple Alleles F. Polygenic Inheritance

B. Autosomal Recessive

Human height and eye color represent this pattern of inheritance. A. Autosomal dominant B. Autosomal recessive C. Incomplete Dominance D. Complete Dominance E. Multiple Alleles F. Polygenic Inheritance

F. Polygenic Inheritance

The offspring of the Tt x Tt will show a 1:2:1 phenotypic ratio. A. Autosomal dominant B. Autosomal recessive C. Incomplete Dominance D. Complete Dominance E. Multiple Alleles F. Polygenic Inheritance

C. Incomplete Dominance

Human blood type illustrates this pattern of inheritance. A. Autosomal dominant B. Autosomal recessive C. Incomplete Dominance D. Complete Dominance E. Multiple Alleles F. Polygenic Inheritance

E. Multiple Alleles

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Final Answer

Final Question