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Bio 20 Review Exam 4 FINAL

Bio 20 Review Exam 4 FINAL - 1 Understand that Down...

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1. Understand that Down syndrome, Turner syndrome, Klinefelter syndrome, and Trisomy 21 represent types of non-disjunction. (Klinefelter expres both genders p. 145, 147) a. Non-disjunction: Chromosomes did not separate properly 2. Remember an incompletely dominant gene will express itself completely. For ex: snapdragon flower will produce a pink flower instead of a red flower. 3. Recall that G. Mendel discovered the fundamental principles of genetics by breeding garden pea plants. (What are two laws) 4. Recollect that two different alleles for a single trait is said to be heterozygous, and that two similar alleles for a single trait is homozygous. (They can be dominant or recessive) 5. Understand that the genetic makeup of an organism is its genotype and the expression of those genes its phenotype. Ex: tongue curling or non tongue curling are phenotypes 6. Remember that a gene that masked its allele partner is called dominant, and a gene that is masked by an allele partner is called recessive. Masking means overriding expression. 7. Recall that there are two sex chromosomes in a diploid mammal cell and one sex chromosome in a haploid mammal cell. Ex: sperm or egg 8.
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