Exam 4 Review

Exam 4 Review - Exam 4 Review Your exam will have some...

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Exam 4 Review Your exam will have some vocabulary and concept questions and some problem solving questions. There will be around 30 questions. You do not need a calculator for the math involved, so you will not be allowed to use one during the exam. I will leave space on the exam for you to write out your work. Practice working the problems we went over in class and the Thinkwell exercises. I have also posted a few more practice problems and there are more problems on the Thinkwell site and on the Course documents Chapter 10 for Life (PURVES). Vocabulary: A definition is good, but understanding the concept is better and comparing similar concepts gives you even more depth of understanding. 1. Homozygous : 2 identical alleles for a given trait 2. Heterozygous : 2 different alleles for a given trait 3. Dominant : the allele of a heterozygote that determines the phenotype. The trait that masks other traits. 4. Incomplete dominant : A heterozygous condition in which both alleles at a gene locus are partially expressed, often producing an intermediate phenotype. Ex: red x white pink 5. Codominant : A heterozygous condition in which both alleles at a gene locus are partially expressed, often producing an intermediate phenotype. Codominance is a condition in which both alleles of a gene pair in a heterozygote are fully expressed, with neither one being dominant or recessive to the other. 6. Recessive : the allele that does not contribute to the phenotype in a heterozygote. The masked trait. 7. Phenotype : physical expression of a trait 8. Genotype : allelic composition of a trait 9. Test cross : cross with a homozygous recessive individual to determine the unknown genotype of another individual. Test cross should help determine whether or not the two genes are on the same chromosome. Test if dominant phenotype is heterozygous or homozygous 10. Monohybrid cross : determines the inheritance of a single trait 11. Dihybrid cross : determines the inheritance of two traits 12. Parentals : initial cross between true-breeding individuals 13. F1 : offspring that result from true-breeding parental cross 14. F2 : resulting offspring from F1 cross 15. Recombinants : new gametes that differs from the gametes that formed the parents 16. Codominance : when both alleles of a heterozygote contribute to the phenotype (ex: blood type: AB, cattle coat: white+ red=roan – white and red are both expressed) codominance blending 17. Multiple alleles : genes with more than two possible alleles 18. Epistasis : condition where one gene’s product affects another gene. In epistasis, two genes assort independently of one another, but a dominant allele for one gene may not be expressed because the product of the second gene masks it. 19.
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This note was uploaded on 05/03/2008 for the course BIO 1306 taught by Professor Adair,tamarah during the Spring '08 term at Baylor.

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Exam 4 Review - Exam 4 Review Your exam will have some...

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