* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Name Date Class
Survey
Document related concepts
History of genetic engineering wikipedia , lookup
Skewed X-inactivation wikipedia , lookup
Human–animal hybrid wikipedia , lookup
Pharmacogenomics wikipedia , lookup
Designer baby wikipedia , lookup
SNP genotyping wikipedia , lookup
Human leukocyte antigen wikipedia , lookup
Genomic imprinting wikipedia , lookup
Hybrid (biology) wikipedia , lookup
Genome-wide association study wikipedia , lookup
Quantitative trait locus wikipedia , lookup
Population genetics wikipedia , lookup
Microevolution wikipedia , lookup
Hardy–Weinberg principle wikipedia , lookup
Transcript
Name Date Class 8th gr. C9 L1 What Is Heredity? Name Date Class What is Heredity? Understanding Main Ideas Study the diagram below. 1. What trait in pea plants is being studied in the cross shown above? ___________________________ 2. What are the two alleles for this trait? 3. Which allele is the dominant allele? Explain how you know. 4. Which allele is the recessive allele? Explain how you know. 5. What alleles do the F1 offspring have? Explain which allele was inherited from each parent. Building Vocabulary Match each term with its definition by writing the letter of the correct definition in the right column on the line beside the term in the left column. 6. ___ genetics a. the passing of traits from parents to offspring 7. ___ allele b. an organism with two different alleles for a trait 8. ___ trait c. a factor that controls traits 9. ___ dominant allele d. a physical characteristics of organisms 10. ___ gene e. an allele whose trait always shows up in the organism 11. ___ hybrid f. 12. ___ heredity g. the scientific study of heredity 13. ___ recessive allele h. an allele whose trait is hidden in the presence of a dominant allele each different form of a gene Name Date Class What Is Heredity? When an organism has a trait controlled by a dominant allele, it can either be a hybrid or a purebred. To find out which, geneticists use a test cross. Read the passage and study the diagram below. Then use a separate sheet of paper to answer the questions that follow the diagram. The Test Cross In a test cross, the organism with the trait controlled by a dominant allele is crossed with an organism with a trait controlled by a recessive allele. If all offspring have the trait controlled by the dominant allele, then the parent is probably a purebred. If any offspring has the recessive strait, then the dominant parent is a hybrid. 1. Is the long-haired cat in the P generation a hybrid or a purebred? Explain your answer. 2. Is the short-haired cat in the P generation a hybrid or a purebred? Explain your answer. 3. If the short-haired cat in the P generation were purebred, what would you expect the offspring to look like? 4. In horses, the allele for a black coat (B) is dominant over the allele for a brown coat (b). A cross between a black horse and a brown horse produces a brown foal. Is the black horse a hybrid or a purebred? Explain. 5. In guinea pigs, the allele for a smooth coat (S) is dominant over the allele for a rough coat (s). Explain how you could find out whether a guinea pig with a smooth coat is a hybrid or a purebred.