Concepts | Questions | Media Resources |
18.1 Genotype and Phenotype | 18.1 Genotype and Phenotype | 18.1 Genotype and Phenotype |
- The physical characteristics of an individual are controlled by inherited genes.
- Dominant genetic traits appear if a single dominant allele is inherited; recessive genetic traits require the inheritance of two recessive alleles.
| - What determines the physical characteristics of an individual?
Answer
- When do dominant traits appear? When do recessive traits appear?
Answer
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18.2 Dominant/Recessive Traits | 18.2 Dominant/Recessive Traits | 18.2 Dominant/Recessive Traits |
- It is possible to determine the chances of an offspring inheriting a particular parental gene, and therefore a particular condition.
- Pedigree charts are used to determine the pattern of inheritance for a condition that runs in the family.
| - How is it possible to recognize an autosomal dominant or recessive
trait from the pattern of inheritance?
Answer
- What are some examples of inherited genetic disorders?
Answer
- What types of alleles must be inherited to exhibit a recessive genetic
disorder? What type of alleles can be inherited to exhibit a dominant
genetic disorder?
Answer
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18.3 Beyond Simple Inheritance Patterns | 18.3 Beyond Simple Inheritance Patterns | 18.3 Beyond Simple Inheritance Patterns |
- Certain traits, such as skin color, behavior, and various syndromes, are polygenic.
- Blood type is controlled by multiple alleles.
- Some traits, like sickle-cell disease, are incompletely dominant.
| - What are some examples of human polygenic traits?
Answer
- How is blood type an example of codominance?
Answer
- What are some examples of incomplete dominance in humans?
Answer
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18.4 Sex-Linked Traits | 18.4 Sex-Linked Traits | 18.4 Sex-Linked Traits |
- Sex-linked traits are usually carried on the X chromosome. Males, with only one X, are more likely to express X-linked traits.
- Some traits are sex-influenced rather than sex-linked.
| - Do the sex chromosomes determine other traits besides an individual's gender?
Answer
- Why do males exhibit X-linked disorders more often than females?
Answer
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