Name_______________________Date________________

Mendelian Genetics SI

A)0%B)25%C)50%D)75%E)100%

1.In sheep, eye color is controlled by a single gene with

two alleles. When a homozygous brown-eyed sheep

is crossed with a homozygous green-eyed sheep,

blue-eyed offspring are produced. If the blue-eyed

sheep are mated with each other, what percent of their

offspring will most likely have blue eyes?

A)AA, aaB)Aa, aa

C)Aa, AaD)aa, aa

E)AA, Aa

2.One hundred and twenty offspring are counted in a

genetic cross. Ninety appear to show the dominant

phenotype and thirty appear recessive. What are the

most likely genotypes of the parents?

A)the genetic makeup of an organism

B)part of a chromosome that codes for a certain

hereditary trait

C)the outward, visible expression of the hereditary

makeup of an organism

D)the shifting of gene positions in chromosomes

E)a sequence of three adjacent nucleotides that

codes for a single amino acid

3.A genotype can be described as

A)100%B)75%C)50%D)25%E)0%

4.Two parents are heterozygous for dominant trait A

and recessive trait a. If they mate, the probability of

producing an offspring who displays the dominant

trait is

A)determines whether a dominant-appearing

individual is homozygous dominant or

heterozygous dominant for that trait

B)suggests that the unknown dominant-appearing

individual is homozygous if any of the test-cross

offspring are recessive

C)suggests that the unknown dominant-appearing

individual is heterozygous if none of the

testcross offspring are recessive

D)is used to determine whether an individual is

homozygous recessive or homozygous dominant

for a given trait

E)is used to determine whether or not a trait is

sex-linked

5.A testcross

A)segregation

B)codominance

C)mutation

D)incomplete dominance

E)independent assortment

6.Two plants with pink flowers are crossed, and the F1

show the following ratio: 1 red: 2 pink: 1 white. The

best explanation for this phenomenon is

A)0%B)25%C)50%D)75%E)100%

7.A particular flower inherits color via incomplete

dominance. A cross between a homozygous blue

flower (BB) and a homozygous red flower (RR)

yields 100% purple flowers. If a cross between a

purple flower and a red flower is performed, what

percentage of the progeny will be purple flowers?

A)Linked genes

B)Incomplete dominance

C)Multiple alleles

D)Codominance

E)Polygenetic inheritance

8.In reference to blood types, sometimes both the A

allele and the B allele are expressed. Which of the

following terms best explains this?

A)Linkage

B)Epistasis

C)Codominance

D)Incomplete Dominance

E)Multiple Alleles

9.When two inherited alleles are expressed at the same

time, which of the following is exhibited?

A)Multiple alleles

B)Sex-linked traits

C)Recessive traits

D)Polygenic inheritance

E)Incomplete dominance

10.Blood types are an example of

A)iiB)IAiC)IBIBD)IAIB

11.Which genotype illustrates codominance of alleles

that control blood type in humans?

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Name_______ Date

Mendelian Genetics SI

A) 0% B) 25% C) 50% D) 75% E) 100%

In sheep, eye color is controlled by a single gene with two alleles. When a homozygous brown-eyed sheep is crossed with a homozygous green-eyed sheep, blue-eyed offspring are produced. If the blue-eyed sheep are mated with each other, what percent of their offspring will most likely have blue eyes? A) AA, aa B) Aa, aa C) Aa, Aa D) aa, aa E) AA, Aa
One hundred and twenty offspring are counted in a genetic cross. Ninety appear to show the dominant phenotype and thirty appear recessive. What are the most likely genotypes of the parents? A) the genetic makeup of an organism B) part of a chromosome that codes for a certain hereditary trait C) the outward, visible expression of the hereditary makeup of an organism D) the shifting of gene positions in chromosomes E) a sequence of three adjacent nucleotides that codes for a single amino acid
A genotype can be described as A) 100% B) 75% C) 50% D) 25% E) 0%
Two parents are heterozygous for dominant trait A and recessive trait a. If they mate, the probability of producing an offspring who displays the dominant trait is A) determines whether a dominant-appearing individual is homozygous dominant or heterozygous dominant for that trait B) suggests that the unknown dominant-appearing individual is homozygous if any of the test-cross offspring are recessive C) suggests that the unknown dominant-appearing individual is heterozygous if none of the testcross offspring are recessive D) is used to determine whether an individual is homozygous recessive or homozygous dominant for a given trait E) is used to determine whether or not a trait is sex-linked
A testcross A) segregation B) codominance C) mutation D) incomplete dominance E) independent assortment
Two plants with pink flowers are crossed, and the F show the following ratio: 1 red: 2 pink: 1 white. The best explanation for this phenomenon is A) 0% B) 25% C) 50% D) 75% E) 100%
A particular flower inherits color via incomplete dominance. A cross between a homozygous blue flower (BB) and a homozygous red flower (RR) yields 100% purple flowers. If a cross between a purple flower and a red flower is performed, what percentage of the progeny will be purple flowers? A) Linked genes B) Incomplete dominance C) Multiple alleles D) Codominance E) Polygenetic inheritance
In reference to blood types, sometimes both the A allele and the B allele are expressed. Which of the following terms best explains this? A) Linkage B) Epistasis C) Codominance D) Incomplete Dominance E) Multiple Alleles
When two inherited alleles are expressed at the same time, which of the following is exhibited? A) Multiple alleles B) Sex-linked traits C) Recessive traits D) Polygenic inheritance E) Incomplete dominance
Blood types are an example of A) ii B) IAi C) IBIB^ D) IAIB
Which genotype illustrates codominance of alleles that control blood type in humans?

A) overproduction and selective breeding B) mutations and elimination of genes C) evolution and asexual reproduction D) sorting and recombination of genes

The puppies shown in the photograph below are all from the same litter. The differences seen with this group of puppies are most likely due to A) intermediate inheritance B) gene linkage C) independent assortment D) crossing-over
A cross between two mice with long tails and brown fur produced the four types of offspring listed below: long tailed with brown fur long tailed with white fur short tailed with brown fur short tailed with white fur Which genetic mechanism best explains the results of this cross? A) 25% B) 50% C) 75% D) 100%
If two roan cattle are crossed, what percent of the offspring are expected to show the parental phenotype for coat color? A) multiple alleles B) incomplete dominance C) sex linkage D) independent assortment
A boy has brown hair and blue eyes, and his brother has brown hair and brown eyes. The fact that they have different combinations of traits is best explained by the concept known as A) 0 B) 2 C) 3 D) 4
In humans, the gene for polydactyly (having extra fingers or toes) is dominant over the gene for the normal number of digits. If parents who are both homozygous dominant for polydactyly have four children, how many of these children would most likely have extra fingers or toes? A) 100% Gg B) 50% GG and 50% gg C) 25% GG , 50% Gg, and 25% gg D) 75% Gg and 25% gg
In a certain species of mouse, gray fur ( G ) is dominant over cream-colored fur ( g ). If a homozygous gray mouse is crossed with a cream-colored mouse, the genotype of the F 1 generation will most likely be A) homozygous dominant B) heterozygous C) hybrid D) homozygous recessive
Kernel color in corn is a trait determined by two alleles. The dominant allele ( P ) produces a purple color, and the recessive allele ( p ) produces a yellow color. The diagram below shows an ear of corn produced by crossing two corn plants. The shaded kernels are purple, and the unshaded ones are yellow. What can the yellow kernels best be described as?

A) Bb × bb and Bb × Bb B) Bb × bb and BB × Bb C) BB × Bb and BB × bb D) BB × BB and Bb × Bb

B represents the dominant allele for a trait and b represents the recessive allele. In which pair of crosses must all of the offspring produced have the same phenotype? A) homozygous red B) homozygous white C) heterozygous red D) heterozygous pink
A geneticist wishes to determine if a red rose of a certain variety is homozygous for the color red. If red is dominant over white, the red rose should be cross-pollinated with roses of the same variety that are A) Intermediate inheritance involved alleles that were not clearly dominant or recessive. B) Mutations occurred during gametogenesis. C) Crossing-over of white and red alleles occurred during meiosis. D) Nondisjunction of homologous pairs of chromosomes resulted in the production of abnormal offspring.
A cross between two plants that have pink flowers produced plants that have red, pink, or white flowers. Which is the most likely explanation for these results? A) 3:1 B) 2:1:2 C) 2:1 D) 1:2:
Two generations of offspring of four o'clock plants are shown in the diagram below. The phenotypic ratio of the F 2 generation is A) multiple allele inheritance B) crossing-over C) sex linkage D) codominance
Crosses between white-coated cattle (CWCW) and red-coated cattle (CRCR) produce roan offspring (CR CW). This type of inheritance pattern is known as Base your answers to questions 34 and 35 on the information and diagram below and on your knowledge of biology. In cats, gene E produces yellow fur and gene B produces black fur. A cat that inherits both of these genes has patches of yellow and black fur and is known as a calico. The alleles for black or yellow are located on the X -chromosome. The cross XBY × XBXE^ is illustrated in the square below. A) codominant autosomal genes B) codominant sex-linked genes C) recessive autosomal genes D) recessive sex-linked genes
Calico coat color is most likely due to A) 1 B) 2 C) 3 D) 4
Yellow male offspring are represented by A) the genetic makeup of autosomes found in the egg cell B) the genetic makeup of autosomes found in the sperm cell C) whether the unfertilized egg contains an X - or Y -chromosome D) whether the sperm that fertilizes the egg contains an X - or Y -chromosome
The sex of a person depends on

A) 22 autosomes and one X -chromosome B) 22 autosomes and one Y -chromosome C) 44 autosomes and XX -chromosomes D) 44 autosomes and XY -chromosomes

A normal human egg cell contains A) The production of testosterone influences the development of male characteristics. B) Reproductive technology has had an important influence on human development. C) Normal female characteristics develop from a single X-chromosome. D) Male characteristics only develop in the absence of X-chromosomes.
The Y-chromosome carries the SRY gene that codes for the production of testosterone in humans. Occasionally a mutation occurs resulting in the SRY gene being lost from theY-chromosome and added to the X-chromosome, as shown in the diagram below. Based on the diagram, which statement is correct? A) XRXR^ × XRY B) XRXR^ × XrY C) XRXr^ × XrY D) XrXr^ × XRY
In fruit flies, red eye color ( R ) is dominant and white eye color ( r ) is recessive. The allele for eye color is carried on the X -chromosome. Which cross would most likely produce 50% white-eyed males and 50% red-eyed males? A) 0% B) 25% C) 50% D) 100%
A man with normal color vision married a woman with normal color vision. The father of the woman was colorblind. If this couple had a daughter, what is the chance this child would be colorblind?

Mendelian Genetics Worksheet with Answer Key, Exercises of Genetics

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Name_______ Date

Mendelian Genetics SI

A) 0% B) 25% C) 50% D) 75% E) 100%

Mendelian Genetics Worksheet with Answer Key, Exercises of Genetics

Related documents

Partial preview of the text

Download Mendelian Genetics Worksheet with Answer Key and more Exercises Genetics in PDF only on Docsity!

Name_______________________ Date________________

Mendelian Genetics SI

A) 0% B) 25% C) 50% D) 75% E) 100%

Name_______ Date