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Transcript
Worksheet: Exam 4 Review Supplemental Instruction Iowa State University Leader: Course: Instructor: Date: Kelly Biol 211 (3) Biederman 3/22/16 1.) If a species has a 2n number of chromosomes = 16 then which of the following is true? A) The species is diploid with 32 chromosomes per cell B) A gamete from this species contains 4 chromosomes C) Each cell has 8 homologous pairs D) The species has 16 sets of chromosomes per cell E) None of the above Follow up: 2.) Which of the following occurs in meiosis but not mitosis? A) chromosome replication B) synapsis of chromosomes C) production of daughter cells D) alignment of chromosomes at the center of cell E) condensation of chromatin 3.) A human cell containing 22 autosomes and a Y chromosome is a A) egg B) zygote C) sperm D) a male somatic cell E) a female somatic cell 4.) Which of the following happens at the conclusion of meiosis I? A) homologous chromosomes are separated B) the chromosome number per cell is conserved C) sister chromatids are separated D) four daughter cells are formed E) the sperm cell fertilizes the egg 5.) A cross between a homozygous purple flowered and a homozygous white flowered pea plants results in offspring with purple flowers. This demonstrates A) blending inheritance B) true breeding traits C) dominance of one trait over another D) a di-hybrid cross E) a mistake by Mendel 6.) When you cross an organism that is homozygous recessive for a trait with one that is a heterozygote for the same trait, what is the chance of producing homozygous recessive offspring? A) 0% B) 25% C) 50% D) 75% E) 100% 1060 Hixson-Lied Student Success Center 515-294-6624 [email protected] http://www.si.iastate.edu 7.) The rare llama-rabbit is known to have 2 traits: head shape (H) and tail length (T) that are controlled by un-linked genes. The genotype of a stud-male llama-rabbit is HhTt. Which of the following is a possible genotype found in his gametes? A) HT B) Hh C) HhTt D) Tt E) H 8.) An organisms appearance or observable traits are referred to as its A) genotype B) phenotype C) character D) trait E) dominant allele 9.) Red-green color blindness in humans is a sex-linked recessive trait. A husband and a wife with normal vision have a color-blind son. What are the genotypes of the parents? A) Xc Xc and XcY B) Xc Xc and XCY C) XC XCand XcY D) XC XC and XCY E) XC Xc and XCY The Mitotic Cell Cycle: H Label each letter What is happening to the chromosomes at each step? If letter (I) was added, what might it represent? What letters = Interphase? Mitosis? How would a circular representation of meiosis differ? Is binary fission more similar to mitosis or meiosis? Compare and Contrast: Mitosis: Meiosis: What stage do they both start out in? What events are unique to this type of cell division? What events/structures are unique to this type of cell division? What is the purpose of this type of cell division? What is the purpose of this type of cell division? Final Product in humans: (Number cells? Ploidy? Relation to original cell?) Final Product in humans: (Number? Ploidy? Relation to original cell?) What human cells does this process produce? How many autosomes/sex chromosomes? What human cells does this process produce? How many autosomes/ sex chromosomes? What problems can arise? What problems can arise? Is genetic variation introduced? How? Is genetic variation introduced? How? For a good animated overview of Mitosis and Meiosis visit: vcell.ndsu.nodak.edu/animations Briefly describe the difference between the following: Genotype vs. Phenotype? Gene vs. Loci vs. Allele? Dominant allele vs. Recessive allele? Homozygous vs. Heterozygous? Are the following homozygous or heterozygous? How many gametes could each produce? HH Rr EeGG TtAa RrHHTT Punnett Square practice: 1. Albinism (lack of skin pigmentation) is caused by a recessive autosomal allele. Persons who are heterozygous for albinism are carriers. Persons who are homozygous recessive have the disease. If a person who does not have the disease and is not a carrier marries a carrier for the disease, what is the chance they will have a child with the disease? What is the chance they will have a child who is a carrier? Show the Punnett square to support your answer. What are the parental genotypes: Are they hetero/homozygous? How many different gametes can each parent produce: 2. You have a dog that is homozygous recessive at locus (A) and has light fur. She has 8 puppies that all express dark fur color. What is most likely the genotype of the father? Show the Punnett square to support your answer. What are the parental genotypes: Are they hetero/homozygous? How many different gametes can each parent produce: 3. Sex linked: If the mother is a carrier for colorblindness XCB then what ratio of her children will be colorblind? (The father is not colorblind.) 4. Dihybrid Crosses: P: GGDD x ggdd F1: F2 (from F1 self): Linkage vs. unlinked? What causes two genes to be linked? Given 2000 offspring, that would mean 500 of each of these phenotypic classes. Say you make this mating, and your actual results look like this: Long Green - 850 Long Blue - 150 Short Green - 150 Short Blue - 850 What is it? Polygenic Inheritance Incomplete Dominance Examples?