UMass Amherst BIOLOGY 283 - Final Review (4 pages)

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Final Review



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Final Review

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Pages:
4
School:
University of Massachusetts Amherst
Course:
Biology 283 - General Genetics
General Genetics Documents

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Final Review Exam 1 In a cross Aa Bb Cc Dd x Aa Bb Cc Dd in which all genes undergo indepedent assortment what portion of offspring are expected to be homozygous recessive for all four genes A 4 Genes are assorted independently so there s a chance of aa x a chance of bb ect In a cross of a round hybrid pea with a true breeding round parent Ww x WW what genotypic proportions would be observed in the offspring A Half heterozygous half homozygous dominant Punnett Square How many different gametes can be formed by an organism that is homozygous for three and heterozygous for two genes A 4 Number of gametes 2 of heterozygous traits The house fly Musca domestica has a haploid chromosome number of 6 How many chromatids should be present in a diploid somatic metaphase cell A 24 Diploid 12 chromosomes 24 chromatids Process Model Organism Cellular Replication E Coli Chloroplasts function Arabidopsis Cell cycle regulation S cerevisiae Cell differentiation C elegans Stage Anaphase I of Meiosis Anaphase of mitosis Anaphase II of Meiosis Chromosome 6 12 6 DNA molecules 12 12 6 Polydactyl is expressed when an individual has extra fingers toes Assume that a man with six fingers and toes marries a woman with a normal number of digits Having extra digits is dominant The couple has one son with normal digits but another with extra digits What is the probability that their next will have polydactyl A Man must be heterozygoues for trait women homozygoues recessive so cross between them will have half normal offspring and half effected offspring A couple has a son with XYY Which nondisjunction event occurred A Nondisjunction in Meiosis II of father FIND DIAGRAMS If two parents one with brown eyes and one with blues eyes produce one twin boy with blue eyes what is the probability that a fraternal twin will transmit blue eye allele to his or her offspring A Bb x bb Bb bb If Bb then chance of passing on b Being Bb x Passing on b 1 4 If bb then 100 chance of passing on b bb x 1 Passing on b



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