E. mendel and the gene check your learning

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Mendel and the Gene

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Mendel's Experiments and Heredity

Which is one of the seven characteristics that Mendel observed in pea plants?

A) flower size

B) leaf shape

C) stem color

D) seed texture

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Which is one of the seven characteristics that Mendel observed in pea plants?

A) flower size

B) leaf shape

C) stem color

D) seed texture

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Why was the fact that Mendel used "true-breeding" plants so important for the success of his research?

A) It made them easier to hybridize with other plants.

B) It ensured that they could not self-pollinate.

C) It ensured that recombinant traits would show in each generation.

D) It ensured that offspring always looked like parents.



Why was the fact that Mendel used "true-breeding" plants so important for the success of his research?

A) It made them easier to hybridize with other plants.

B) It ensured that they could not self-pollinate.

C) It ensured that recombinant traits would show in each generation.

D) It ensured that offspring always looked like parents.






Which of the following is a Mendelian cross?

A) mating two true-breeding organisms with the same trait

B) mating two true-breeding organisms with different traits

C) mating any two organisms with the same trait

D) mating any two organisms with different traits



Which of the following is a Mendelian cross?

A) mating two true-breeding organisms with the same trait

B) mating two true-breeding organisms with different traits

C) mating any two organisms with the same trait

D) mating any two organisms with different traits






Imagine you are performing a cross involving seed color in garden pea plants. What F1 offspring would you expect if you cross true-breeding parents with green seeds with those with yellow seeds, if you know that yellow is dominant to green?

A) 100 percent yellow-green seeds

B) 50 percent yellow, 50 percent green

C) 100 percent yellow seeds

D) 25 percent green, 75 percent yellow

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Imagine you are performing a cross involving seed color in garden pea plants. What F1 offspring would you expect if you cross true-breeding parents with green seeds with those with yellow seeds, if you know that yellow is dominant to green?

A) 100 percent yellow-green seeds

B) 50 percent yellow, 50 percent green

C) 100 percent yellow seeds

D) 25 percent green, 75 percent yellow



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Imagine you are performing a cross involving seed color in garden pea plants. If you assigned the symbol “G” to the allele responsible for yellow seeds, and the symbol “g” to the allele responsible for green seeds, what would you expect the genotype of the F1 offspring to be? (Assume you crossed two true-breeding parents GG x gg).

A) All of them will be Gg

B) 50 percent will be Gg, 25% GG and 25% gg

C) They will all be gg

D) None of these answers is correct



Imagine you are performing a cross involving seed color in garden pea plants. If you assigned the symbol “G” to the allele responsible for yellow seeds, and the symbol “g” to the allele responsible for green seeds, what would you expect the genotype of the F1 offspring to be? (Assume you crossed two true-breeding parents GG x gg).

A) All of them will be Gg

B) 50 percent will be Gg, 25% GG and 25% gg

C) They will all be gg

D) None of these answers is correct



Consider a cross where inflated pods are dominant and constricted pods are recessive. If you performed this cross and obtained 650 inflated pod plants in the F2 generation, approximately how many constricted pod plants would you expect to have?

A) 600

B) 1950

C) 468

D) 217

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Consider a cross where inflated pods are dominant and constricted pods are recessive. If you performed this cross and obtained 650 inflated pod plants in the F2 generation, approximately how many constricted pod plants would you expect to have?

A) 600

B) 1950

C) 468

D) 217



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If two purple flowered (Bb) pea plants were crossed, what is the probability of obtaining a white flowered (bb) pea plant in the offspring? (B = purple allele, b = white allele). B is dominant and associated with being purple.

A) 1/2

B) 1/4

C) 3/4

D) 0



If two purple flowered (Bb) pea plants were crossed, what is the probability of obtaining a white flowered (bb) pea plant in the offspring? (B = purple allele, b = white allele). B is dominant and associated with being purple.

A) 1/2

B) 1/4

C) 3/4

D) 0






A horse has 64 chromosomes. How many does it inherit from each parent?

A) 32

B) 64

C) 16

D) 8



A horse has 64 chromosomes. How many does it inherit from each parent?

A) 32

B) 64

C) 16

D) 8






How is it possible that organisms with the same phenotype can have different genotypes?

A) Different genetic makeups (phenotypes) can lead to the same physical traits (genotype)

B) Different physical traits (phenotypes) can lead to the same genetic makeup (genotype)

C) Different genetic makeups (genotypes) can lead to the same physical traits (phenotype)

D) Different physical traits (genotypes) can lead to the same genetic makeup (phenotype)



How is it possible that organisms with the same phenotype can have different genotypes?

A) Different genetic makeups (phenotypes) can lead to the same physical traits (genotype)

B) Different physical traits (phenotypes) can lead to the same genetic makeup (genotype)

C) Different genetic makeups (genotypes) can lead to the same physical traits (phenotype)

D) Different physical traits (genotypes) can lead to the same genetic makeup (phenotype)






What is the main purpose of using a Punnett square?

A) to predict the possible outcomes of a genetic cross or mating and their expected frequencies

B) to determine whether an organism that expressed a dominant trait was a heterozygote or a homozygote

C) to determine whether the breeding cross was a monohybrid

D) to determine whether the breeding was 'true-breeding'



What is the main purpose of using a Punnett square?

A) to predict the possible outcomes of a genetic cross or mating and their expected frequencies

B) to determine whether an organism that expressed a dominant trait was a heterozygote or a homozygote

C) to determine whether the breeding cross was a monohybrid

D) to determine whether the breeding was 'true-breeding'






Why are males more likely to be affected by X-linked traits than females?

A) Males have two X chromosomes.

B) Males are homologous and not hemizygous.

C) Only one allele is required to express the trait.

D) Males have three alleles for X-linked traits.



Why are males more likely to be affected by X-linked traits than females?

A) Males have two X chromosomes.

B) Males are homologous and not hemizygous.

C) Only one allele is required to express the trait.

D) Males have three alleles for X-linked traits.






Why is a dominant lethal inheritance pattern rarely seen?

A) Recessive lethal inheritance is rare not dominant lethal

B) The allele only lasts one generation and is not transmitted

C) Two copies of the mutated allele are required

D) The mutated allele must come from the father



Why is a dominant lethal inheritance pattern rarely seen?

A) Recessive lethal inheritance is rare not dominant lethal

B) The allele only lasts one generation and is not transmitted

C) Two copies of the mutated allele are required

D) The mutated allele must come from the father






Which of the following methods used by Mendel was crucial to his understanding of how traits were inherited?

A) All of these.

B) He cross-bred plants from different species.

C) He observed the inheritance of only one trait for each cross.

D) He counted the numbers of progeny produced by each cross and calculated ratios of the offspring.



Which of the following methods used by Mendel was crucial to his understanding of how traits were inherited?

A) All of these.

B) He cross-bred plants from different species.

C) He observed the inheritance of only one trait for each cross.

D) He counted the numbers of progeny produced by each cross and calculated ratios of the offspring.






If an individual expresses a phenotype associated with a dominant gene, does he or she have a recessive allele for that gene?

A) You cannot tell unless you know what the parent's phenotypes are.

B) You cannot tell unless you know how old the offspring are.

C) You cannot tell unless you know how many offspring are produced.

D) You cannot tell unless you know the genotype of that person.

Free to share, print, make copies and changes. Get yours at www.boundless.comSaylor OER. "BIO102: Introduction to Evolutionary Biology and Ecology « Saylor.org – Free Online Courses Built by Professors." CC BY 3.0

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If an individual expresses a phenotype associated with a dominant gene, does he or she have a recessive allele for that gene?

A) You cannot tell unless you know what the parent's phenotypes are.

B) You cannot tell unless you know how old the offspring are.

C) You cannot tell unless you know how many offspring are produced.

D) You cannot tell unless you know the genotype of that person.


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A plant with red flowers (Rr) is crossed with another plant with red flowers (Rr). What is the probability that an offspring from this cross will have white flowers (rr)?

A) 1/2

B) 3/4

C) 0

D) 1/4



A plant with red flowers (Rr) is crossed with another plant with red flowers (Rr). What is the probability that an offspring from this cross will have white flowers (rr)?

A) 1/2

B) 3/4

C) 0

D) 1/4






For human blood type, the A and B alleles are codominant, while the O allele is recessive. If an AB mother had children with a B blood type father (genotype BO), what proportion of the children would express the B protein alone?

A) 1/2

B) 1/4

C) 3/4

D) 0/4

Free to share, print, make copies and changes. Get yours at www.boundless.comSaylor OER. "BIO102: Introduction to Evolutionary Biology and Ecology « Saylor.org – Free Online Courses Built by Professors."

CC BY 3.0 http://www.saylor.org/courses/bio102/


For human blood type, the A and B alleles are codominant, while the O allele is recessive. If an AB mother had children with a B blood type father (genotype BO), what proportion of the children would express the B protein alone?

A) 1/2

B) 1/4

C) 3/4

D) 0/4


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If the genotype of one animal is AaBb, and the genotype of the other animal is Aabb, what percentage of their offspring will be AaBb?

A) 1/4

B) 9/16

C) 1/2

D) 3/16



If the genotype of one animal is AaBb, and the genotype of the other animal is Aabb, what percentage of their offspring will be AaBb?

A) 1/4

B) 9/16

C) 1/2

D) 3/16




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E. mendel and the gene check your learning