Question 1

Speculate on the molecular basis for dominance and recessiveness,using flower color as an example,where red is dominant over white.

Accepted Answer

The answer of Speculate on the molecular basis for dominance...

Question 2

A monohybrid (one-gene)cross yields 4 genotypic classes,and a dihybrid (two-gene)cross yields 16.How many classes are expected from a tetrahybrid (four-gene)cross?

Accepted Answer

The answer of A monohybrid (one-gene)cross yields 4 genotypic classes,and...

Question 3

True-breeding individuals are produced by repeated backcrossing.

Accepted Answer

True-breeding individuals are those that produce offspring with the same trait as the parents when self-fertilized or crossed with another true-breeding individual. This is achieved through repeated backcrossing, which involves crossing the desired trait with a true-breeding individual for that trait over several generations to produce offspring that are homozygous for the desired trait.

Question 4

Mendel selected seven traits to analyze in his famous pea plant crosses,and all of these traits yielded expected 3:1 phenotypic F₂ ratios in monohybrid crosses.He was fortunate in his selection of these traits.How so? What problem might he have encountered that may have yielded confusing ratios?

Accepted Answer

The answer of Mendel selected seven traits to analyze in...

Question 5

Explain why it is expected that heterozygotes will be produced twice as frequently as either homozygote in a monohybrid F₁ cross.

Accepted Answer

The answer of Explain why it is expected that heterozygotes...

Question 6

You observe an individual of your favorite study organism expressing the dominant phenotype for a certain trait.How would you go about determining if the individual was homozygous dominant or heterozygous for that trait?

Accepted Answer

The answer of You observe an individual of your favorite...

Question 7

What characteristics make an organism a good candidate for Mendelian studies?

Accepted Answer

The answer of What characteristics make an organism a good...

Question 8

A man and a woman with normal phenotypes have several children,one of whom has albinism.
a.What can you conclude about the genotype of the mother?
b.What is the probability that the children who do not display albinism are heterozygous?

Accepted Answer

The answer of A man and a woman with normal...

Question 9

A testcross with a heterozygous dominant individual will yield only heterozygous dominant offspring.

Accepted Answer

A testcross involves crossing an individual with a homozygous recessive individual to determine the genotype of the original individual. Therefore, if a heterozygous dominant individual is testcrossed with a homozygous recessive individual, the offspring will be a mix of heterozygous and homozygous recessive individuals.

Question 10

The dominant allele of a gene is the most frequently found allele in a population.

Accepted Answer

The dominant allele of a gene is not necessarily the most frequently found allele in a population; it is the allele that expresses its trait even in the presence of a different (recessive) allele. Dominance refers to the relationship between alleles in terms of their phenotypic expression, not their frequency in the population.

Question 11

The phenotype determines the genotype.

Accepted Answer

It is actually the opposite - the genotype determines the phenotype. The genotype refers to an organism's genetic material, while the phenotype is the physical and behavioral traits that result from the interaction between an organism's genotype and its environment. The genotype provides the foundation for the phenotype, but the phenotype can also be influenced by external factors such as nutrition or environmental conditions.

Question 12

A monohybrid cross is made for flower color,where purple is dominant to white.Fifteen hundred F₂ offspring are analyzed.How many white flowers are expected?

Accepted Answer

The answer of A monohybrid cross is made for flower...

Question 13

Mendel was the first scientist to describe the concept of diploidy-the idea that organisms like pea plants and humans possess two complete sets of genetic material.Summarize Mendel's observations and the reasoning that led him to this conclusion.

Accepted Answer

The answer of Mendel was the first scientist to describe...

Question 14

The genotypic F₂ ratio expected in a dihybrid cross is 9:3:3:1.

Accepted Answer

The genotypic ratio in a dihybrid cross is 1:2:1:2:4:2:1:2:1, while the phenotypic ratio is 9:3:3:1.

Question 15

A man with albinism and a woman with a normal phenotype have several children,one of whom displays albinism.
a.What can you conclude about the genotype of the mother?
b.What is the probability that the children who do not display albinism are heterozygous?

Accepted Answer

The answer of A man with albinism and a woman...

Question 16

Recessive alleles are usually loss-of-function mutations.

Accepted Answer

Recessive alleles are typically masked by dominant alleles and do not produce a functional protein or produce a non-functional version of the protein. This type of mutation is known as a loss-of-function mutation. However, there are rare cases where recessive alleles produce a gain-of-function mutation, where the protein produced by the mutated allele has an abnormal or overactive function.

Question 17

In snapdragons,the genes A,B,C,D,and E assort independently of one another.If an Aa Bb Cc dd EE plant is crossed with an Aa bb cc Dd Ee plant,what is the probability of obtaining an offspring that is phenotypically dominant for all five traits?

Accepted Answer

The answer of In snapdragons,the genes A,B,C,D,and E assort independently...

Question 18

State the key difference between Mendel's principle of segregation and independent assortment.

Accepted Answer

The answer of State the key difference between Mendel's principle...

Question 19

Match between columns
                        Premises: Euploid
Aneuploid
Diploid
Polyploid
Haploid

Accepted Answer

The Answer of One half of a complete set of is...

Question 20

Match between columns
                        Premises: Dominant allele
Phenotype
Test cross
Recessive allele
Monohybrid cross
Genotype
Dihybrid cross

Accepted Answer

The Answer of Allele that has to be homozygous to is...

Quiz 11: Mendelian Genetics

Speculate on the molecular basis for dominance and recessiveness,using flower color as an example,where red is dominant over white.

A monohybrid (one-gene)cross yields 4 genotypic classes,and a dihybrid (two-gene)cross yields 16.How many classes are expected from a tetrahybrid (four-gene)cross?

True-breeding individuals are produced by repeated backcrossing.

Mendel selected seven traits to analyze in his famous pea plant crosses,and all of these traits yielded expected 3:1 phenotypic F₂ ratios in monohybrid crosses.He was fortunate in his selection of these traits.How so? What problem might he have encountered that may have yielded confusing ratios?

Explain why it is expected that heterozygotes will be produced twice as frequently as either homozygote in a monohybrid F₁ cross.

You observe an individual of your favorite study organism expressing the dominant phenotype for a certain trait.How would you go about determining if the individual was homozygous dominant or heterozygous for that trait?

What characteristics make an organism a good candidate for Mendelian studies?

A man and a woman with normal phenotypes have several children,one of whom has albinism. a.What can you conclude about the genotype of the mother? b.What is the probability that the children who do not display albinism are heterozygous?

A testcross with a heterozygous dominant individual will yield only heterozygous dominant offspring.

The dominant allele of a gene is the most frequently found allele in a population.

The phenotype determines the genotype.

A monohybrid cross is made for flower color,where purple is dominant to white.Fifteen hundred F₂ offspring are analyzed.How many white flowers are expected?

Mendel was the first scientist to describe the concept of diploidy-the idea that organisms like pea plants and humans possess two complete sets of genetic material.Summarize Mendel's observations and the reasoning that led him to this conclusion.

The genotypic F₂ ratio expected in a dihybrid cross is 9:3:3:1.

A man with albinism and a woman with a normal phenotype have several children,one of whom displays albinism. a.What can you conclude about the genotype of the mother? b.What is the probability that the children who do not display albinism are heterozygous?

Recessive alleles are usually loss-of-function mutations.

In snapdragons,the genes A,B,C,D,and E assort independently of one another.If an Aa Bb Cc dd EE plant is crossed with an Aa bb cc Dd Ee plant,what is the probability of obtaining an offspring that is phenotypically dominant for all five traits?

State the key difference between Mendel's principle of segregation and independent assortment.

Please select the best match for each term.

Please select the best match for each term.

Quiz 11: Mendelian Genetics

Speculate on the molecular basis for dominance and recessiveness,using flower color as an example,where red is dominant over white.

A monohybrid (one-gene)cross yields 4 genotypic classes,and a dihybrid (two-gene)cross yields 16.How many classes are expected from a tetrahybrid (four-gene)cross?

True-breeding individuals are produced by repeated backcrossing.

Mendel selected seven traits to analyze in his famous pea plant crosses,and all of these traits yielded expected 3:1 phenotypic F2 ratios in monohybrid crosses.He was fortunate in his selection of these traits.How so? What problem might he have encountered that may have yielded confusing ratios?

Explain why it is expected that heterozygotes will be produced twice as frequently as either homozygote in a monohybrid F1 cross.

You observe an individual of your favorite study organism expressing the dominant phenotype for a certain trait.How would you go about determining if the individual was homozygous dominant or heterozygous for that trait?

What characteristics make an organism a good candidate for Mendelian studies?

A man and a woman with normal phenotypes have several children,one of whom has albinism. a.What can you conclude about the genotype of the mother? b.What is the probability that the children who do not display albinism are heterozygous?

A testcross with a heterozygous dominant individual will yield only heterozygous dominant offspring.

The dominant allele of a gene is the most frequently found allele in a population.

The phenotype determines the genotype.

A monohybrid cross is made for flower color,where purple is dominant to white.Fifteen hundred F2 offspring are analyzed.How many white flowers are expected?

Mendel was the first scientist to describe the concept of diploidy-the idea that organisms like pea plants and humans possess two complete sets of genetic material.Summarize Mendel's observations and the reasoning that led him to this conclusion.

The genotypic F2 ratio expected in a dihybrid cross is 9:3:3:1.

A man with albinism and a woman with a normal phenotype have several children,one of whom displays albinism. a.What can you conclude about the genotype of the mother? b.What is the probability that the children who do not display albinism are heterozygous?

Recessive alleles are usually loss-of-function mutations.

In snapdragons,the genes A,B,C,D,and E assort independently of one another.If an Aa Bb Cc dd EE plant is crossed with an Aa bb cc Dd Ee plant,what is the probability of obtaining an offspring that is phenotypically dominant for all five traits?

State the key difference between Mendel's principle of segregation and independent assortment.

Please select the best match for each term.

Please select the best match for each term.

Mendel selected seven traits to analyze in his famous pea plant crosses,and all of these traits yielded expected 3:1 phenotypic F₂ ratios in monohybrid crosses.He was fortunate in his selection of these traits.How so? What problem might he have encountered that may have yielded confusing ratios?

Explain why it is expected that heterozygotes will be produced twice as frequently as either homozygote in a monohybrid F₁ cross.

A monohybrid cross is made for flower color,where purple is dominant to white.Fifteen hundred F₂ offspring are analyzed.How many white flowers are expected?

The genotypic F₂ ratio expected in a dihybrid cross is 9:3:3:1.