Name _______________________________
Date __________________
Ch 11 Mendel and Gene Idea
Overview – just read this section
Concept 11.1 Mendel used the scientific approach to identify two laws of inheritance
1. Explain the difference between a character and a trait.
2. What is hybridization?
3. Explain the following:
P generation -
F1 generation -
F2 generation –
4. Explain the law of segregation.
5. Review the following terms: Punnett square, homozygous, heterozygous, phenotype and
genotype.
6. Explain what happens in a test cross. Why is it done?
7. Explain the law of independent assortment.
8. Review the terms monohybrid cross and dihybrid cross and complete the following.
Monohybrid cross
PP x pp where P = purple, p = white
Genotypes ___________________________________________
Phenotypes __________________________________________
Pp x Pp
Genotypes _____________________________________________
Phenotypes _____________________________________________
Dihybrid cross YYRR x yyrr
where Y = yellow, y = green, R = round, r = wrinkled
Genotypes ________________________________________________________________
Phenotypes ________________________________________________________________
YyRr x YyRr
Genotypes _________________________________________________________________
Phenotypes _________________________________________________________________
Concpet 11.2 The laws of probability govern Mendelian inheritance
9. Explain the multiplication rule and give an example
10. Explain the addition rule and give an example.
11. Complete #2 of the Concept check 11.2 on p. 214.
12. Complete the “What if” question from the Concept check 11.2 on p. 214.
Concept 11.3 Inheritance patterns are often more complex than predicted by simple
Mendelian genetics
13. Explain the following terms and give examples of each.
a. complete dominance
b. incomplete dominance
c. codominance
14. To look at the relationship between dominance and phenotype, explain Tay-Sachs disease.
15. Not all dominant alleles for a particular character are found predominantly in a population.
Give an example from the book where a recessive allele is the predominant trait.
16. What is meant by multiple alleles?
17. Explain pleiotropy.
18. Explain epistasis and give an example.
19. Explain polygenic inheritance and give an example.
20. Give an example of how the environment can affect an inherited trait.
Concept 11.4 Many human traits follow Mendelian patterns of inheritance.
21. What is a pedigree?
22. Draw the symbols that represent people and conditions in a pedigree
a. male
b. female
c. affected male
d. affected female
e. carrier
23. Explain the following diseases – What effect they have on the body and what causes them.
Disease
Cystic fibrosis
Effect on body
Sickle –cell anemia
Achondroplasia
Huntington’s Disease
24. What are multifactorial disorders? Give an example.
25. What do genetic counselors do?
Cause