A TEAM OF UP TO: 2 APPROXIMATE TIME: 50 minutes

EVENT PARAMETERS: Non-programmable calculators may be used, but no reference materials may be used during the competition. 

THE COMPETITION: This event may be run at stations. Contestants will be given a combination of genetic problems to solve, pedigrees, karyotypes, or diagrams to analyze. Every attempt should be made to avoid over-emphasis on a particular area.

1. Some possible areas to be tested may include: dominant, recessive, incomplete dominance, monohybrid crosses and dihybrid crosses, test cross, multiple alleles, sex-linkage, genotype, phenotype, pedigrees, karyotypes, mitosis, rneiosis, nondisjunction, common genetic disorders, DNA structure and replication.

2. Process skills may include data analysis, predictions, calculations, inferences, and observations.

SAMPLE QUESTIONS:

1. In guinea pigs, short hair (S) is dominant over long hair (s). Two heterozygous dominant guinea pigs are crossed (Ss X Ss). What will be the genotype ratio of their offspring? What will be the phenotype ratio of their ratio?

2. A man who is blood type AB marries a woman who is blood type 0. What blood types might be present in their children?

3. Examine a pedigree and answer the questions about sex of individuals, relationships, phenotype, and genotypes

4 Examine a karyotype and answer questions about sex of individual, number of chromosomes monosomy, trisomy, and genetic disorders.

5. Examine data and/or diagrams concerning mitosis, meiosis, DNA and answer questions about the processes.

6, In mice, the gene for color coat (C) is dominant to the gene for albino (c), and gene for straight whiskers (S) is dominant to the gene for bent whiskers (s). Two heterozygous dominant mice are crossed CcSs x CcSs. Show the Punnett Square of genotypes for this cross and determine the genotype and phenotype ratios for this cross.

SCORING: Highest number of correct solutions will determine the winner. Selected questions may be used as tiebreakers.