Ch.14 - Mendelian GeneticsSee all chapters
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Ch.1 - Introduction to Biology
Ch.2 - Chemistry
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Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
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Ch.9 - Respiration
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Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
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Ch.32 - Overview of Animals
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Ch.35 - Plant Anatomy
Ch.36 - Vascular Plant Transport
Ch.37 - Soil
Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
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Ch.44 - Osmoregulation and Excretion
Ch.45 - Endocrine System
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Ch.55 - Conservation Biology

Mendel's Experiment

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Sections
Mendel's Experiment
Independent Assortment
Extensions to Mendel
Genetic Counseling

Concept #1: History of Mendel's Experiment

Concept #2: Overview of Mendel's Experiment

Concept #3: Punnett Square and Monohybrid Cross

Practice: Phenotype ratio: 

Genotype ratio:  

Practice: Phenotype ratio:

Genotype ratio:  

Practice: Phenotype ratio:

Genotype ratio: 

Practice: What did Mendel name the generations of plants in his experiments?

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Practice: The allele Q is ______________________ to q, the _________________________ allele.

Practice: An organism that always produces offspring with the same trait of interest is said to be ___________________________

Practice: What process accounts for Mendel’s Law of Segregation?

Additional Problems
The pea plant (Pisum sativum) is a good choice for studying heredity because it:  a. Develops slowly b. Produces only a few offspring c. Is easy to control which plants mate with each other d. Has only a few traits that appear in two easily distinguishable forms e. All are correct
Mendel called a trait that is masked:  a. Homozygous b. Heterozygous c. Dominant d. Recessive e. None are correct
An allele that exerts its effects whenever it is present is:  a. Recessive b. Dominant c. Homologous d. Homozygous e. Heterozygous
Gray seed color in peas is dominant to white. Assume that Mendel conducted a series of experiments where plants with gray seeds were crossed among themselves, and the following progeny were produced: 302 gray and 98 white.(i) What is the most probable genotype of each parent?(ii) Based on your answer in (i) above, what genotypic and phenotypic ratios are expected in these progeny? (Assume the following symbols: G = gray and g = white.)a. (i) GG xgg; (ii) genotypic = 3:1, phenotypic = 1:2:1b. (i) gg xGg; (ii) genotypic = 1:2, phenotypic = 3:1c. (i) Gg xGg; (ii) genotypic = 3:1, phenotypic = 9:3:3:1d. (i) GG xGg; (ii) genotypic = 1:2:1, phenotypic = 2:1e. (i) Gg xGg; (ii) genotypic = 1:2:1, phenotypic = 3:1
When Mendel crossed short (tt) pea plants with short pea plants the offspring:  a. Were all tall b. Were a mix of tall and short c. Were nonexistent d. None of these are correct e. Were all short
When Mendel crossed tall (Tt) plants with tall plants the offspring:  a. Did not grow and reproduce b. Were always short c. Were always tall d. Were always a mix of short and tall e. Were sometimes tall, and sometimes a mix of tall and short
If the two alleles for a particular gene are different the gene pair is:  a. Homologous b. Heterozygous c. Homozygous d. Dominant e. Recessive
If an individual is heterozygous for a particular trait:  a. Each parent contributed a different allele for that trait b. Each parent contributed the same allele for that trait c. One parent contributed two different alleles for that trait d. One parent contributed two copies of the same allele for that trait
If an individual is homozygous for a particular trait:  a. Each parent contributed a different allele for that trait b. One parent contributed two different alleles for that trait c. Each parent contributed the same allele for that trait d. One parent contributed two copies of the same allele for that trait
Genotype means:  a. The number of gametes in an individual b. The combination of alleles in an individual c. The number of chromosomes in an individual d. The observable expression of the genes in an individual e. The genes an individual has
Phenotype means:   a. The number of gametes in an individual b. The number of chromosomes in an individual c. The combination of alleles in an individual d. The genes an individual has e. The observable expression of the genes in an individual
The "P" in P generation:  a. Refers to pure breeding b. Refers to parental c. Refers to potential offspring d. Refers to the recessive allele e. All are correct
In the study of genetics the offspring of the parental generation is referred to as the:  a. Wild type generation b. The F1 generation c. The P generation d. The F2 generation e. The phenotype
A monohybrid cross is a mating between two individuals that are both:  a. Homozygous for one gene b. Heterozygous for two genes c. Homozygous for two genes d. Heterozygous for one gene e. None of these are correct
If a scientist wanted to carry out a monohybrid cross for stem length in pea plants, which of the following crosses should be performed?  a. Tt with TT b. Tt with tt c. TT with TT d. Tt with tt e. Tt with Tt
Mendel's monohybrid cross of "Tt" parents resulted in a tall to short ratio of:  a. 1:1 b. 1:2 c. 2:1 d. 3:1 e. 1:3
Any monohybrid cross consisting of one dominant and one recessive allele for the trait being studied should result in a ratio of ______________ dominant to __________________ recessive.  a. Three, one b. One, one c. One, two d. Two, one e. One, three
In the following problem, capital letters will be used to denote a dominant trait, and lower-case letters will be used for the recessive trait.In peas, the stem length may result in a tall (T) or dwarf (t) plant. What proportion of the offspring in the following crosses would be expected to be tall, and what proportion dwarf?1. TT x tt 2. TT x Tt 3. tt x Tt
If you cross two pea plants, one with green peas and the other with yellow peas. All of the offspring have yellow peas. You conclude:  a. The yellow parent was homozygous for the recessive allele b. The yellow parent was homozygous for the dominant gene c. The yellow parent was homozygous for the dominant allele d. The yellow parent was homozygous for the recessive gene e. The yellow parent was heterozygous
If a pea plant is homozygous for yellow seeds (YY), which gametes could it produce?  a. Y b. Y or y c. y d. Yy e. YYyy
If you cross two heterozygous Yy pea plants, what fraction of the offspring will be yellow?  a. 50% b. 75% c. 25% d. 0% e. 100%
The locus T (2 alleles, T1= tall plants and G2=short plants) in moss controls plant height in the gametophyte (haploid stage) but has no effect on phenotype in the sporophyte (diploid) stage. Sperm from a tall moss gametophyte fertilizes an egg from a short moss gametophyte to produce a sporophyte. This sporophyte produces spores, which grow up to be new gametophytes. What will be the heights of the next generation of gametophytes?a) all intermediate in height b) all short c) all talld) half short and half tall   e) no way to tell from the information given
Why was it important that Mendel made sure that his parental individuals came from pure-breeding lines?a. to ensure individuals with the dominant trait were homozygotesb. to ensure individuals with the dominant trait were heterozygotesc. to ensure individuals with the recessive trait were homozygotesd. to ensure individuals with the recessive trait were heterozygotese. to ensure individuals didn’t have any genetic diseases
Define the following terms: true breeding, hybridization, monohybrid cross, P generation, F1 generation, F2 generation.
Summarize the relationship between a gene and an allele.
Mendel found that yellow pea pod color (G) was dominant to green pea pod color (g). For each of the crosses below, what percentage of offspring are expected to be yellow?I. GG x Gg          II. Gg x gg          III. gg x ggA. 100%B. 75%C. 66%D. 50%E. 25%F. 33%G. 0%
Which of the following does NOT represent genotype?A. Whether we represent the alleles with capital or lowercase letters.B. The property that is dictated by the protein made from a gene.C. The sequence in the DNA for a gene.D. The sequence for a characteristic contained on the chromosomes.E. Whether the individual is a homozygous or heterozygous.
Two trait crosses using pea plants: You may use the Canvas exercise Dihybridcross RoundWr for guidance. Start with a RrYy round, yellow pea plant and a Rryy round green pea plant. What is the likelihood of obtaining plants that have round, green peas? Show your Punnett square and calculation as a percentage. What percentage are wrinkled yellow peas?
If offspring exhibit a 3:1 phenotypic ratio, what are its parent's genotypes?