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which of the following models represents the genetic material that controls inherited traits
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- Suppose a geneticist is using a three-point test cross to map three linked rabbit morphology and behavioral mutations called si, It, and Le. The gene si is associated with the silky fur phenotype, and It is associated with the long-tailed phenotype. Both si and It are recessive mutations with respect to wild type. Le is a dominant mutation that confers the lethargic phenotype. The geneticist first crosses true-breeding lethargic rabbits to true-breeding silky fur, long-tailed rabbits. Next, the geneticist backcrosses the Fj progeny to the silky fur, long-tailed parents, and obtains the results reported in the table. Phenotype Number lethargic 815 silky fur, long-tailed 807 long-tailed 177 silky fur, lethargic 179 silky fur 7 long-tailed, lethargic 5 silky fur, long-tailed, lethargic 29 wild type 29 Place the genes in the correct order in the chromosome. Answer Bank si It LeA woman diagnosed with early-onset Alzheimer's due to a mutation of the APP genehas children with a man that has no family history of familial Alzheimer's. Give the probability of each possible genotype with corresponding phenotype. (The woman has two possible allele combinations. You must show both possibilities)Which of the following statements describes the multifactorial inheritance in genetics? Question options: One locus is associated with different traits. Several loci are associated with the trait. One locus is associated with variable phenotypes of a trait. Environment plays minimal or no role in the final phenotype. Phenotype is determined by different environmental factors.
- Read the following passage carefully about some aspects of genetics involving a certain species of Drosophila and then answer the following questions in parts The gene for the production of eye colour in this species of fruit fly can be expressed as either normal red-eyes or as brown-eyes. The allele for the normal red eyes is dominant to that of brown, and is transmitted in normal Mendelian fashion. A gene involved with body colour in this species of fruit fly is located on the non-homologous portion of the X chromosome, and has two alleles, grey and yellow, where the grey allele is dominant to yellow. The two genes are NOT linked. a) Produce a key to clearly show the nature of the alleles associated with the eye colour in this species of Drosophila, and in each case justify your choice of letters and / or style of presentation to best depict the genetics involved. b) State the type of genetics involved in terms of body colour, justifying your answer with the evidence from…Epistasis refers to the interaction of genes wherein the expression of one gene is dependent on another gene. For example, suppose there are two genes that code for flower color in a plant, where red, WW or Ww, is typically dominant over expression of white, ww, and yellow, YY or Yy, is typically dominant over green, yy. One type of epistasis expresses a pattern where a dominant allele in either gene produces a red phenotype. Classify the F1 flower color ratio that would be produced from the dihybrid cross for each type of epistasis.Which of the following statements describes the multifactorial inheritance in genetics? O Phenotype is determined by different environmental factors. O One locus is associated with variable phenotypes of a trait. Several loci are associated with the trait. One locus is associated with different traits. O Environment plays minimal or no role in the final phenotype.
- Shown in the pictures below are the degrees of dominance in the inheritance of flower color in some plants. *Based on the phenotypes (or maybe genotype), differentiate between complete dominance, incomplete dominance, and codominance. Be able to discuss the difference briefly but concisely. You may also refer to the definition.Suppose a mutant fruit fly with blue eyes was recently discovered. It is later determined that the blue eye trait is recessive to the wild-type red eye trait. What is the most common way to represent the mutant and wild-type alleles?. Choices are Mutant: Bl, bl Wild-type: Bl+ , re, bl+, or wtTrue-breeding diabetes-resistant male monkeys were bred to true-breeding wildtype female monkeys. All the F1 monkeys are phenotypically wildtype. The F1 monkeys are bred to each other, producing eight F2 babies. Only one of the eight F2 monkeys has the diabetes resistance. Is it possible for this condition to be controlled by a single autosomal gene? Use chi-square analysis to test the hypothesis, show your work, and explain your conclusion.
- This is a conjectural question— there is no single “right” answer— that is good for discussion over tea and crumpets. In what ways might it be possible to prevent genetic discrimination due to information made available by the Human Genome Project?There are two genes that determine the coat colour expression in some dogs: eumelanin and merle. These genes are located on two separate chromosomes. For the eumelanin gene, black coat colour (E) is dominant over red coat colour (e). The merle gene controls the degree to which these coat colours are expressed through incomplete dominance. The following table describes the merle gene expression. Genotype Phenotype MM White Mm Half colour (Grey or light red) mm Full colour (Black or Red) Two dogs heterozygous for both traits were crossed. What phenotypic ratio is expected in the F1 generation? Answer: Phenotype: White Grey Black Light Red RedThere are two genes that determine the coat colour expression in some dogs: eumelanin and merle. These genes are located on two separate chromosomes. For the eumelanin gene, black coat colour (E) is dominant over red coat colour (e). The merle gene controls the degree to which these coat colours are expressed through incomplete dominance. The following table describes the merle gene expression. Genotype Phenotype MM White Mm Half colour (Grey or light red) mm Full colour (Black or Red) A grey dog that is heterozygous for the eumelanin gene mates with a light red dog. 1. What is the probability they would have a grey puppy? 2. What is the probability they would have a grey or light red puppy?
