combinations of alleles in offspring from two parents. Test crosses can be performed to determine whether dominant phenotypes are heterozygous or homozygous. Mendel formed his law of segregation from this work. Today we know that many traits are controlled by dominant and recessive alleles of genes. Genes have a specific location called the gene locus. Genotype describes the actual alleles for a gene; phenotype is the physical expression of the genotype. Two Trait Inheritance Mendel also performed experiments
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Biology is defined as “the study of life” from the Greek‚ bios meaning ‘life’ and logos meaning ‘study’. This approach has one key assumption. Our behaviours and the way we experience things are due to our biology. Genes‚ chemicals such as hormones‚ brain structure and systems. They believe that the environment does not have any influence on your condition. This approach tends to fit in with the nature nurture debate. A biological perspective is relevant to the study of psychology in three ways:
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one sex to another c. carry some genes that have nothing to do with sex d. were unknown to Mendel e. all of these Section: 11.1 Bloom’s: knowledge Ans: e 3. Which of the following designates a normal human female? a. XXY b. XY c. XX d. XYY e. XO Section: 11.1 Bloom’s: knowledge Ans: c 4. Which of the following designates a normal human male? a. YY b. XX c. XY d. XO e. XYY Section: 11.1 Bloom’s: knowledge Ans: c 5. The SRY gene is found on a. the human Y chromosome
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Hardy Weinberg Lab I. Purpose: The Hardy Weinberg principle states that the allele and gene frequencies will stay constant from generation to generation as long as no other evolutionary influences come along. The evolutionary influences can be things such as mutation‚ mate choice‚ selection‚ genetic drift‚ gene flow‚ and meiotic drive. Frequency is the proportion of individuals in a certain category relative to the total number of individuals considered. The frequency of an allele or genotype is
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the follow-up questions. Questions: 1. According to the pedigree‚ is cystic fibrosis inherited as a dominant or as a recessive trait? Explain how you made your conclusion using evidence from the pedigree and the principles of genetics. The pedigree shows that cystic fibrosis is a recessive trait. This is shown by having one cystic fibrosis gene and having one non-cystic fibrosis gene. Now this can mean that you may be the carrier of the disease‚ but not actually have the disease. According
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Imperfecta Dominant and Recessive Pattern Background Osteogenesis Imperfecta (OI) is heterogenous genetic disorder in the type I collagen and is characterized by susceptibility bone fragility and fractures with variable severity and presumed or proven defect in type I collagen biosynthesis. Type I collagen is the abundant protein composing the extracellular matrix of bone and skin in human body. There are 3 pathogenesis mechanisms of OI: 85-90% of individuals with OI have dominant mutation in
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matings between different pea plants. c. it is possible to obtain large numbers of progeny from any given cross. d. peas have an unusually long generation time. e. many of the observable characters that vary in pea plants are controlled by single genes. 2. A plant with purple flowers is allowed to self-pollinate. Generation after generation‚ it produces purple flowers. This is an example of a. hybridization. b. incomplete dominance. c. true-breeding. d. the law of segregation. e. polygenetics. 3
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that one gamete will contain the G allele? 3. Complete the graphic organizer to define the characteristics of homozygous and heterozygous genotypes and phenotypes. Homozygous Genotype Phenotype Heterozygous 4. The dominant allele for smooth pod shape in peas is S. The recessive allele for constricted pod shape is s. In the Punnett square‚ show the result of crossing two heterozygous parents (Ss). Write the genotype and the phenotype of each type of offspring in the space provided. S S s s
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Genetics Practice Problems‚ book #1 1. In peas‚ the gene for tallness is dominant to the gene for shortness. What offspring phenotypes and genotypes would be expected from the following crosses‚ and in what proportions? a. Heterozygous x heterozygous b. Heterozygous x homozygous tall c. Homozygous tall x homozygous short 2. If blue eye color in man is recessive to all other colors‚ could: i. Brown eyed parents have a blue eyed child
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world. This lab observed the corn plant of the Zea mays species to determine the genotype for the gene of tall versus dwarf in unknown parent corn plants by observing the seedlings produced. It was hypothesized that one parent is heterozygous while the other is homozygous recessive. The predicted results were that half of the seedlings would contain the tall gene and the other half would have the dwarf gene. Plants were grown for two weeks under good quality and equal care. They were then observed by
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