University:
Williams College
Course:
BIOL 202 | Genetics
Academic year:

2021
Views:

481

Pages:

2
Author:

rezancuk2j

Name Date Class Key Concept Builder Understanding Inheritance Key Concept What determines the expression of traits? Directions: On each line, write the term from the word bank that correctly completes each sentence. Some terms may be used more than once. alleles heterozygous chromosomes homozygous dominant phenotype 1. An organism’s genes genes recessive genotype are located on threadlike structures called chromosomes . 2. The different forms of genes are called alleles 3. A trait’s phenotype . is its observable expression in the organism. 4. The observable expression of a trait is determined by its genotype 5. When an organism has two alleles same, the genotype be homozygous . 6. When the two alleles genotype 7. The heterozygous pea allele is for a certain trait that are the of that trait is said to are different, the is said to be heterozygous . genotype Rr results in a round pea, because the round dominant 8. The wrinkled pea phenotype is recessive homozygous . genotype rr. to the wrinkled pea allele. and has the Content Practice A Understanding Inheritance Directions: On the line before each definition, write the letter of the term that matches it correctly. Each term is used only once. 1. threadlike structures in cells E A. dominance C 2. contain instructions for traits B. pedigree K 3. two different forms of a gene C. genotype P 4. outward appearance D. heterozygous I 5. determines outward appearance A 6. represented by uppercase letters M 7. represented by lowercase letters E. chromosomes F. codominance G. homozygous H. incomplete dominance G 8. RR I. genes D 9. Rr J. environmental factors K. alleles O 10. shows possible outcomes of genetic B 11. shows inherited traits in a family M. recessiveness H 12. produces a blend of the parents’ N. polygenic inheritance O. Punnett square 13. when both alleles are expressed P. phenotype crosses L. multiple alleles phenotypes F L14. determines human blood type N 15. when multiple genes determine a phenotype J 16. can sometimes influence expression of genes

Understanding Inheritance Lesson Outline Answers

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