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Mendelian Genetics

D. It can be only tt

If a pea plant shows a recessive phenotype,
A. It can be either TT or Tt
B. It can be either Tt or tt
C. It can be only TT
D. It can be only tt
E. It can be TT, Tt, or tt

E. Aa only

The F1 offspring of a monohybrid cross would show the genotype(s)
A. AA and Aa
B. Aa and aa
C. AA, Aa, and aa
D. AA only
E. Aa only

A. Polygenic

Which type of inheritance results in continuous variation often a bell-shaped curve-because genes at many loci are involved?
A. Polygenic
B. Autosomal Dominant
C. Autosomal Recessive
D. X-Linked
E. Sex-Influenced

B. A line between a circle and a square represents a mating

In a pedigree chart, which is correct?
A. Circles = males; squares = females
B. A line between a circle and a square represents a mating
C. A carrier with a normal phenotype is represented by a black circle or square
D. Offspring are represented by triangles
E. All of these are true

D. ABO blood types in humans

A classical example of multiple alleles is
A. Coat color spotting in cattle
B. Height in garden peas
C. Pink flowerd in heterozygous snapdragons
D. ABO blood types in humans
E. Albinism in humans and animals

C. Locus

The location on a chromosome where a particular gene is located is known as the:
A. Allele
B. Dihybrid
C. Locus
D. Diploid
E. Autosome

C. AA, Aa, and aa

The F2 offspring of a monohybrid cross would show the genotype(s)
A. AA and Aa
B. Aa and aa
C. AA, Aa, and aa
D. AA only
E. Aa only

C. Homozygous dominant

If the individuals exhibiting a dominant phenotype are crossed and produce only offspring with the dominant phenotype, what would be the logical genotype of the parents?
A. Homozygous recessive
B. Heterozygous dominant
C. Homozygous dominant
D. Unable to determine by the given information
E. Heterozygous recessive

A. Mate them together and see what color the offspring are--that will be the dominant color

If you had two guinea pigs of opposite sex, both homozygous, one black and one brown, but you didn't know which the dominant characteristic was, how would you find out the dominant color?
A. Mate them together and see what color the offspring are--that will be the dominant color
B. Mate them together and see what color the offspring are--the other will be the dominant color
C. Mate them together, then mate their offspring to see what color the grandchildren are--that will be the dominant color
D. Mate them together, then mate their offspring to see what color the grandchildren are--the other color will be the dominant color
E. None of the choices are correct

B. Alternative forms of a gene for a single trait, such as blue eyes or brown eyes

What are alleles?
A. Genes for different traits, such as hair color or eye color
B. Alternative forms of a gene for a single trait, such as blue eyes or brown eyes
C. The locations of genes on a chromosome
D. Recessive forms of a kind of characteristic carried by genes
E. Dominant forms of a kind of characteristic carried by genes

B. Dihybrid cross

In which kind of cross would you expect to find a ratio of 9:3:3:1 among the F2 offspring?
A. Monohybrid cross
B. Dihybrid cross
C. Testcross
D. Polygenic cross
E. Multiple allele cross

C. Pink flowers in heterozygous snapdragons

A classical example of incomplete dominance is
A. ABO blood groups in humans
B. Height in garden peas
C. Pink flowers in heterozygous snapdragons
D. Coat color in rabbits
E. Albinism in humans and animals

E. All of these are possible

An individual with blood type A marries an individual with blood type B. What blood types could their offspring exhibit?
A. AB
B. A
C. B
D. O
E. All of these are possible

D. The non-tongue rollers who learn to roll their tongues and the student who can roll his tongue while his parents cannot are two situations that cast doubt on the heritability issue. The situation where a student cannot roll his tongue while his parents can is inconclusive

The ability to roll the edges of the tongue upward in a U-shape has been considered to be an inherited ability. The standard assumption is that tongue-rolling is a dominant allele at a single gene locus. Which of the following would cast doubt on this assumption?
A. A teacher reports that after testing her class on the ability to roll their tongue, with very little effort the non-tongue-rollers can learn to also roll their tongues
B. A student who can roll his tongue has a mother and father, both of whom cannot
C. A student who cannot roll his tongue has a mother and father, both of whom can.
D. The non-tongue rollers who learn to roll their tongues and the student who can roll his tongue while his parents cannot are two situations that cast doubt on the heritability issue. The situation where a student cannot roll his tongue while his parents can is inconclusive
E. Behaviors are not inherited, only structures are inherited

A. Complete dominance

The traits Mendel studied in garden peas showed
A. Complete dominance
B. Incomplete dominance
C. Epistasis
D. Pleiotrophy
E. Polygenic inheritance

A. yes; TtEe; ttee

If a human who is a tongue roller (T) and has unattached ear lobes (E) marries a person who cannot roll their tongue and has attached earlobes, could they produce an offspring that was also a non-tongue roller with attached earlobes? What would be the genotype of the first parent? the second parent?
A. yes; TtEe; ttee
B. yes; TtEE; ttEe
C. no; TTEE; ttee
D. yes; TTEe; ttee
E. Unable to determine from the information given

E. Two heterozygous, one homozygous recessive and one homozygous dominant is a likely outcome, but all heterozygous or two, three or all four homozygous are also possible

Unattached earlobes (EE or Ee) are described in the textbook as domtinant over attached earlobes (ee). A couple both have unattached earlobes. Both notice that one of their parents on both sides has attached earlobes (ee). Therefore, they correctly assume that they are carriers for attached earlobes (Ee). The couple proceed to have four children.
A. They can be certain that three will be heterozygous and one homozygous recessive
B. If the first three are heterozygous, the fourth must be homozygous recessive
C. The children must repeat the grandparents' genotype
D. All children must have unattached earlobes since both parents possess the dominant gene for it.
E. Two heterozygous, one homozygous recessive and one homozygous dominant is a likely outcome, but all heterozygous or two, three or all four homozygous are also possible

D. About one-fourth will be white and three-fourths green since it is similar to a monohybrid cross

Some plants fail to produce chlorophyll, and this trait appears to be recessive. If we locate a plant that is heterozygous for this trait, self-pollinate it and harvest seeds, what are the likely phenotypes of these seeds when they germinate?
A. All will be green with chlorophyll since that is the dominant trait
B. All will be white and lack chlorophyll since this is self-pollinated
C. About one-half will be green and one-half white since that is the distribution of the genes in the parents
D. About one-fourth will be white and three-fourths green since it is similar to a monohybrid cross
E. About one-fourth will be green and three-fourths white since it is similar to a monohybrid cross

False

True or False
For an autosomal dominant disorder, two affected parents cannot have an unaffected child.

True

True or False
The phenotype is the physical appearance of an individual

True

True or False
Each gamete carries one factor, now called an allele, for each inherited trait.

True

In a case of incomplete dominance, the phenotypic ratio of the F2 generation is the same as the genotypic.

True

Polygenic traits such as height or weight are often influenced by the environment of the organism.

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