4: Mendelian Genetics
Mendel's principles, Punnett squares, genotype/phenotype ratios, and autosomal pedigree analysis.
LibreTexts reference: Mendelian Genetics
Mendelian Cross Generations and Descriptions
Click to show Mendelian Cross Generations and Descriptions example problem
Match each of the following Mendelian crosses and generational stages with their corresponding descriptions.
Note: Each choice will be used exactly once.
| Your Choice | Prompt | |
|---|---|---|
| 1. F1 generation | ||
| 2. hybrid cross | ||
| 3. test cross | ||
| 4. backcross | ||
| 5. F2 generation |
Drag one of the choices below:
- A. the subsequent generation derived from interbreeding or self-breeding of F1 generation hybrids
- B. a genetic cross that involves the F1 generation generation being mated with one of the parent types
- C. a cross to uncover the genotype of an individual with the dominant phenotype by mating it with a homozygous recessive organism
- D. a cross that brings together two true-breeding individuals who are homozygous for different sets of traits
- E. the first generation in a cross; the offspring of the parental generation
Mendel's Foundational Principles and Descriptions
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Match each of the following Mendel's Foundational Principles of Genetics with their corresponding descriptions.
Note: Each choice will be used exactly once.
| Your Choice | Prompt | |
|---|---|---|
| 1. Law of Segregation | ||
| 2. Law of Independent Assortment | ||
| 3. Principle of Dominance | ||
| 4. Principle of Paired Factors |
Drag one of the choices below:
- A. The inheritance of one trait doesn't influence the inheritance of another.
- B. When the gametes are formed, the factors separate and are distributed as units to each gamete.
- C. For each characters there is a dominant allele, the phenotype is determined by that allele.
- D. The genetic makeup for each character involves two alleles.
Mendelian Genetics Terms and Definitions
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Match each of the following Mendelian genetics terms with their corresponding definitions.
Note: Each choice will be used exactly once.
| Your Choice | Prompt | |
|---|---|---|
| 1. dominant | ||
| 2. homozygous | ||
| 3. alleles | ||
| 4. heterozygous | ||
| 5. genotype |
Drag one of the choices below:
- A. same version of a gene inherited from each parent
- B. different versions of the same gene, such as A or a
- C. describes a trait that masks the expression of another trait when both versions of the gene are present
- D. chemical makeup of DNA that factors into a particular phenotype
- E. presence of two different gene copies
Monohybrid Cross Genotypes and Phenotypes
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Match each of the following parental genotypes in monohybrid crosses with their corresponding descriptions of the progeny.
Note: Each choice will be used exactly once.
| Your Choice | Prompt | |
|---|---|---|
| 1. AA×Aa | ||
| 2. Aa×aa | ||
| 3. AA×aa | ||
| 4. aa×aa | ||
| 5. AA×AA | ||
| 6. Aa×Aa |
Drag one of the choices below:
- A. Yields offspring with 50% homozygous dominant and 50% heterozygous genotypes
- B. Produces only heterozygotes in progeny
- C. Generates a 1:1 phenotype ratio in progeny
- D. Results in all homozygous dominant offspring
- E. Produces a 3:1 phenotype ratio in progeny
- F. All offspring have the same recessive genotype and phenotype
Mendelian Cross Generations
Click to show Mendelian Cross Generations example problem
Which one of the following Mendelian crosses and generational stages correspond to the description 'a cross designed to reveal the genotype of a dominant phenotype individual by pairing it with a homozygous recessive individual'.
Mendel's Foundational Principles
Click to show Mendel's Foundational Principles example problem
Which one of the following Mendel's Foundational Principles of Genetics correspond to the description 'When different alleles exist, the dominant alleles determines the organism's traits.'.
Mendelian Genetics Terms
Click to show Mendelian Genetics Terms example problem
Which one of the following Mendelian genetics terms correspond to the definition 'the two copies of a gene are identical'.
Monohybrid Cross Genotype Outcomes
Click to show Monohybrid Cross Genotype Outcomes example problem
Which one of the following parental genotypes in monohybrid crosses correspond to the description of the progeny '50% of the offspring are homozygous recessive'.