Summary: Bio H Second Semester
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11 Complex Inheretance and human heredity
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11.1 Basic Patterns of Human inheretance
This is a preview. There are 11 more flashcards available for chapter 11.1
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What percentage of the children in this family inherited Tay-Sachs disease?
The percentage of the children in this family that inherited Tay-Sachs disease is 25%. -
Do any of the grandchildren in this family have polydactyly?
Yes, one of the grandchildren in this family has polydactyly. -
Why are recessive traits difficult to study?
Recessive traits are more difficult to study because people who carry the allele do not always show the trait. -
What percentage of people with achondroplasia have parents of average size?
About 75 percent of people with achondroplasia have parents of average size. -
How is the inheritance of a dominant disorder shown on a pedigree?
The pedigree shows the inheritance of the dominant disorder, polydactyly—extra fingers and toes. A person with dominant disorders could be homozygous or heterozygous for the trait. A person who does not have polydactyly would be homozygous recessive for the trait. -
What did Archibald Garrod study?
Archibald Garrod was studying a disorder that results in black urine and affects bones and joints. -
How do scientists use a pedigree?
Scientists use a diagram called a pedigree to trace inheritance of a trait through several generations. A pedigree uses symbols to illustrate inheritance of the trait. -
How are genotypes deduced?
A pedigree can be used to learn the genotype of a person. The genotype is determined by observing the phenotypes, or physical traits, of a person. -
What is a carrier in terms of genetic disorders?
A person who is heterozygous for a recessive disorder is called a carrier. -
How are generations represented in a pedigree?
Roman numerals are used to represent generations—I for the parents, II for the children, and so on. Arabic numbers are used to represent the individuals within a generation.
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