| Concepts | Questions | Media Resources |
23.1 Mendel's Laws - Today it is known that alleles (alternate forms of a gene), located on chromosomes, control the traits of individuals.
- Mendel discovered certain laws of heredity after doing experiments with garden peas during the mid-1800s.
- The law of segregation states that each organism contains two factors for each trait, and the factors segregate during formation of gametes.
- A testcross can be used to determine the genotype of an individual with the dominant phenotype.
- The law of independent assortment states that every possible combination of parental factors is present in the gametes.
| - Explain the difference between "genotype" and "phenotype."
Answer
- When considering two alleles for each of two traits that are located on different chromosomes, why will gametes contain every possible combination of the traits?
Answer
| Essential Study Partner
Introduction
Genetics
Monohybrid Cross
Dihybrid Cross
Recombination Art Quizzes
Mendel's Experiment Results
Testcross
Dihybrid Cross General Biology Weblinks
Mendelian Genetics |
23.2 Beyond Simple Inheritance Patterns - Polygenic traits include skin color, behavior, and various syndromes.
- Blood type is controlled by multiple alleles and exhibits codominance.
| - If a woman has type O blood, could a man with type AB conceive children with type O blood? Explain.
Answer
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Beyond Mendel Art Quizzes
Continuous Variation
Incomplete Dominance
Multiple Alleles – ABO Blood Groups |
23.3 Sex-Linked Inheritance - Certain traits, unrelated to the gender of the individual, are controlled by genes located on the sex chromosomes.
- Males who inherit an allele for an X-linked recessive disorder exhibit the disorder because they inherit only one X chromosome.
| - Why are sex-linked disorders, such as red-green colorblindness, much more common in males than in females?
Answer
| Art Quiz
Barr Bodies |
23.4 Inheritance of Linked Genes - Alleles that occur on the same chromosome form a linkage group and tend to be inherited together.
| - How is it possible to easily determine whether two genes are linked on the same chromosome or whether they occur on different chromosomes?
Answer
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