Exam 11: Mendelian Genetics

In holly,serrated leaves are dominant to smooth-edged leaves,and red berries are dominant to green berries.Two holly plants heterozygous for leaf edge shape and berry color are crossed together.Assuming that the two traits assort independently of one another,what proportion of the progeny will have smooth-edged leaves and green berries?

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Question 1

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

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(True/False)

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Question 2

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False

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

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Question 3

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Combinatorials.Each individual offspring genotype has an equal likelihood of occurring (= $\frac { 1 } { 4 }$ ),but since there are two ways to make heterozygotes (Aa and aA),together they occur with a $\frac { 1 } { 4 }$ + $\frac { 1 } { 4 }$ = $\frac { 1 } { 2 }$ frequency,twice that of either homozygote,which occur at a frequency of $\frac { 1 } { 4 }$ each.

Two individuals can be phenotypically identical,yet have different genotypes for a given trait.

(True/False)

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Question 4

The phenotype determines the genotype.

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Question 5

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

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Question 6

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?

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Question 7

The probability that two parents with a family of four will have one girl and three boys is

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Question 8

In peas,tall plants are dominant to short plants.A cross between a tall pea plant and a short pea plant results in half the progeny being tall,and the other half being short.Therefore,the tall parent plant is genotypically

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Question 9

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?

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Question 10

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?

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Question 11

In his experiments,Mendel noted that when two traits are involved in a genetic cross,they are inherited independently of each other.The reason for this is that

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Question 12

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?

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Question 13

If the results of a chi-square test of a given set of data show a P value greater than 0.05,then the null hypothesis

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Question 14

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

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Question 15

In a pea plant that is heterozygous for seed color,what proportion of gametes will carry the recessive allele?

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Question 16

A couple with three girls is expecting a fourth child.The probability that this child is also a girl is

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Question 17

True-breeding individuals are produced by repeated backcrossing.

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Question 18

A dihybrid cross yields 320 F₂ offspring.How many are expected to resemble the homozygous recessive parental?

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Question 19

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.

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Question 20

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Exam 11: Mendelian Genetics

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

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

Two individuals can be phenotypically identical,yet have different genotypes for a given trait.

The phenotype determines the genotype.

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

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?

The probability that two parents with a family of four will have one girl and three boys is

In peas,tall plants are dominant to short plants.A cross between a tall pea plant and a short pea plant results in half the progeny being tall,and the other half being short.Therefore,the tall parent plant is genotypically

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?

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?

In his experiments,Mendel noted that when two traits are involved in a genetic cross,they are inherited independently of each other.The reason for this is that

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?

If the results of a chi-square test of a given set of data show a P value greater than 0.05,then the null hypothesis

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

In a pea plant that is heterozygous for seed color,what proportion of gametes will carry the recessive allele?

A couple with three girls is expecting a fourth child.The probability that this child is also a girl is

True-breeding individuals are produced by repeated backcrossing.

A dihybrid cross yields 320 F2 offspring.How many are expected to resemble the homozygous recessive parental?

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.

Genetics: An Introduction

DNA: The Genetic Material

DNA Replication

Gene Function

Gene Expression: Transcription

Gene Expression: Translation

Dna Mutation, DNA Repair, and Transposable Elements

Genomics: The Mapping and Sequencing of Genomes

Functional and Comparative Genomics

Recombinant DNA Technology

Chromosomal Basis of Inheritance

Extensions of and Deviations From Mendelian Genetic Principles

Genetic Mapping in Eukaryotes

Genetics of Bacteria and Bacteriophages

Variations in Chromosome Structure and Number

Regulation of Gene Expression in Bacteria and Bacteriophages

Regulation of Gene Expression in Eukaryotes

Genetic Analysis of Development

Genetics of Cancer

Population Genetics

Quantitative Genetics

Molecular Evolution

Filters

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

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

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?

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?

A dihybrid cross yields 320 F₂ offspring.How many are expected to resemble the homozygous recessive parental?