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bio take home exam 3 - Name Samara Woolfolk Date Bio 120...

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Name: Samara Woolfolk Date:11-29-2010 Bio 120 sec 55. Bio 120 Section 55 Exam 3 (100 pts total) Short Answer. (1 pt each unless otherwise indicated) 1. Living organisms have distinct heritable features called characters. What are character variants called? Answer: A character variant is called a trait. 2. What type of plants produce offspring of the same variety when they self- pollinate? Answer: They type of plant that produces offspring of the same variety when they self-pollinate are True breeding. 3. In Mendel’s pea plant experiments, which generation was the true-breeding generation? Answer: P Generation or the Parent Generation. 4. When two plants with differing traits for the same character are cross- pollinated, what is the F 1 generation called?
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Name: Samara Woolfolk Date:11-29-2010 Bio 120 sec 55. Answer: The F1 genereation would be called hybrid. 5. Define dominant trait. Answer: Dominant trait is the gene that is expressed in the offspring. 6. Define recessive trait. Answer: Recessive trait is when the inherited gene is not expressed or masked my the dominant trait otherwise paired up with another recessive trait will be expressed. 7. Two organisms are heterozygous for a gene that displays a “complete dominance” pattern of inheritance. If these organisms mate, what will the ratio of inheritance be for these organisms’ offspring with respect to the dominant and recessive phenotypes? Answer: The phenotypic ratio of inheritance would be a 3:1 ratio. 8. Fill in the blanks: Different alleles of the same gene reside at a specific
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Name: Samara Woolfolk Date:11-29-2010 Bio 120 sec 55. locus on a specific Chromosome . 9. Suppose a gene has two alleles, allele A and allele B. What determines whether this gene will be defined as allele A or allele B? Answer: Whatever trait is dominant will determine if the allele is called ‘allele A’ or ‘ allele B’. 10. Define the Law of Segregation. Answer: The law of segregation is when the 2 alleles for each gene separate during gamete formation. 11. Which specific cellular process is responsible for the law of segregation? Answer: Gamete or meiosis formation. 12. Define the Law of Independent Assortment. Answer: This is Mendel’s second law, it means that each pair of alleles that are together are separated or “assorted” when gametes are forming. This means that when there are the 4 haploid cells at the end of gamete production that each will get half of the allele.
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Name: Samara Woolfolk Date:11-29-2010 Bio 120 sec 55. 13. Two organisms are heterozygous for two genes. Each gene displays a “complete dominance” pattern of inheritance. If these organisms mate, what will the ratio of inheritance be for these organisms’ offspring with respect to the combination of phenotypes that can result from the two genes?
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