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Transcript
Biology Test: Chapter 6 Introduction to Genetics 1. _____ What type of allele is always expressed? a. dominant allele c. recessive allele 2. b. homologous allele d. incomplete allele _____In pea plants, the tallness or shortness is known as a. genotype c. dominance 3. _____ The haploid number of chromosomes for a human is a. 23 4. b. phenotype d. gametes b. 26 c. 46 d. 92 _____ Cells that contain only a single set of chromosomes are a. homologous c. diploid b. haploid d. heterozygous 5. _____ Which process reduces the number of chromosomes in a diploid cell by half to produce gametes? a. mitosis 6. b. codominance a. 50 d. meiosis _____An identical pair of alleles for a trait(TT or tt) has what type of genotype? a. homologous b. homozygous 7. c. crossing-over c. heterozygous d. segregation _____ In the cross Tt x tt, what percentage of pea plants will be short? b. 75 c. 25 d. 100 8. _____ Crossing different true-breeding(purebred) stocks produces offspring called a. P generation b. F2 generation 9. a. traits c. cross-overs d. hybrids _____ The different forms of a gene are called b. alleles c. gametes d. hybrids 10. _____Crossing over is the exchange of genetic information between a. reproductive cells c. any 2 chromosomes b. diploid cells d. homologous chromosomes 11. In a pea plant, axial flower position is dominant over terminal flower position. What genotype and phenotype ratios will result if a heterozygous axial pea plant is crossed with a pea plant with terminal flowers? (Show work) 12. During metaphase I of meiosis, homologous chromosomes line up at the equator of a cell. A) Diagram this in a cell with four chromosomes. B) Label: chromosome, chromatid, spindle fiber, pole, centromere, tetrad C) Explain what happens next. 13. Look at the diagram below of Polygenic Inheritance Parakeets. Draw a diagram how a blue and a yellow parakeet may produce a yellow parakeet. Be sure to show which gametes are used from each parakeet to produce a green parakeet. 14. A female horse that is pure black and a pure trotter is crossed with a male horse that is hybrid for both traits. A) What are the genotypes of the parents? B) What gametes are produced by each of the parents? C) Draw a Punnet square representing this cross. D) What are the genotypic and phenotypic ratios that result? Genotype: Phenotype: During which phase(s), does following occur? Write the correct answer on the line provided. For some, there may be more than one answer. S phase of Interphase Metaphse II Prophase I Anaphase I Prophase II Anaphase II Metaphase I Telophase I Telophase II 1. __________ The chromosomes line up as a tetrad at the equator. 2. __________ The chromosomes move to the poles. 3. __________ The spindle fiber shortens. 4.__________ DNA synthesis occurs. 5. __________Homologous chromosomes pair up at the equator. 6. __________The cell membrane pinches forward. 7. __________ The sister chromatids divide and move apart. 8.__________Chromosomes lined up at the equator is not in a tetrad. 9.__________ Homologous chromosomes BEGIN to pair up. 10.__________ Sister chromatids, still joined, move toward the poles.