Q1.Some genetic disorders are caused by alleles inherited from the parents. (a) What are alleles? ........................................................................................................................ ........................................................................................................................ (1) (b) Describe how embryos can be screened for the alleles that cause genetic disorders. ..........................................................
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• To observe how a disease can act as a selective force • To describe changes in allele frequencies in a population as a result of a selective force Hypothesis The starting ratio of HbA to HbS is 3:1; in a typical population‚ the Homozygous Dominant Gene would become the standard‚ but because carrying the Heterozygous version of the allele has an advantage to fighting Malaria it will become the dominant Allele for the population. The HbA/HbS gene will thrive because it helps in the fight against
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one big‚ the offspring will turn out to be medium size. Gregor Mendel: Suggested that there would be a recessive and a Dominant allele. If the offspring inherited the genes from their parents the recessive gene will always be masked by the dominant gene (in the example above‚ the tallest parent would have a dominant tall allele that would mask the recessive small allele causing the offspring to be tall). * Gregor Mendel’s Experiments: Method: Consisted of crossing a variety of tea plants to
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albinism‚ a genetic disorder‚ may be due to a single gene mutation. The allele for albinism is recessive to the allele for no albinism. A woman is heterozygous for albinism. Her male partner is homozygous for the ‘normal’ allele. a Does the woman suffer from the condition? no b What percentage of their children are likely to be carriers? 1:4 c Explain what is meant by the term ‘symptomless carrier’. Carries allele but doesn’t show affects Q2 If parents are aware of a genetic disease within
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Punnett square is a tool which charts the possible 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
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anatomical terminology‚ metric conversion and genetics‚ specifically the concept of dominant and recessive alleles in a human pedigree. Objectives Objectives for this week’s lab include: 1) Review anatomical terminology‚ 2) Demonstrate metric conversion knowledge‚ and 3) Review the concepts of genetic inheritance and demonstrate knowledge of the inheritance patterns of dominant and recessive alleles through a human pedigree analysis. Overview Understanding and proper use of anatomical terminology is
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your conclusion using evidence from the pedigree and the principles of genetics. Cystic Fibrosis is a recessive trait. You have to inherit two copies of the allele to have cystic fibrosis. If you have just one of these alleles you could be a carrier of cystic fibrosis‚ but have absolutely no symptoms. If two carriers of this allele have a child then there could be a one in four chance that child would have cystic fibrosis. I made my conclusion by using the evidence to see that from the pedigree
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an 11 : 11 ratio‚ do you think it would be possible to find a pod with all yellow peas? All green? Explain. Answer: Yes‚ it is possible to find a pod with only yellow peas or heterozygous for the seed color gene‚ if all the flowers had dominant allele in a given fruit/pod. This could be also one example of rare changes at a physiological level. 3. In Table 2-1‚ state the recessive phenotype in each of the seven cases. Answer: wrinkled seeds; green seeds; white petals; pinched pods; yellow
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b. If one of the rough F1 animals is mated to its rough parent‚ what progeny would you expect? This would be a monohybrid cross: Rr x Rr => 1/4 RR‚ 1/2 Rr‚ 1/4 rr. 4. In maize‚ a dominant allele A is necessary for seed color‚ as opposed to colorless (a). Another gene has a recessive allele w that results in waxy starch‚ as opposed to normal starch (W). The two genes segregate independently. What are the phenotypes and relative frequencies of offspring from each of the following crosses
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Plants vs. Zombies: A Lesson on Artificial Selection and Classification Team Name: Team Members: Performance Task: There is a Zombie Apocalypse caused by a comet that traveled too close to the earth. People who were not sheltered during the comet’s passing were turned into zombies. It is believed that the comet was created by aliens to prepare our planet for invasion. Plants and Fungi were also affected by the comet and mutated and now carry many unusual traits. For some unknown reason these plants
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