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Life Science Unit Review

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Asexual or Sexual Reproduction Q: Limits the spread of harmful traits A: Asexual reproduction because each offspring is genetically identical to the parent

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds Cross a heterozygous purple plant (Pp) vs a homozygous dominant purple plant (PP). What are the genotypes and phenotypes of the offspring? PP Pp PP Pp P p P P Genotypes: PP, Pp Phenotypes: All Purple

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Asexual or Sexual Reproduction Q: Requires only one parent A: Asexual reproduction

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Asexual or Sexual Reproduction Q: Works best in stable environments that experience little change A: Asexual reproduction

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Asexual or Sexual Reproduction Q: Offspring can sometimes show a genetic trait (including disease) that the parents did not have A: Sexual reproduction

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds Cross a heterozygous tall plant (Tt) vs a heterozygous tall plant (Tt). What are the genotypes and phenotypes of the offspring? TT Tt tt T t T t Genotypes: TT, Tt, tt Phenotypes: First two are tall, last one is short

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds Tallness in plants: what is the genotype for a homozygous dominant TT

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Mitosis or Meiosis Creates an exact copy of the original cell Mitosis

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Asexual or Sexual Reproduction Q: Each offspring is genetically identical to the parent so if the organism is well adapted to the environment the offspring will be exactly the same A: Asexual reproduction

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds Flower color what is the phenotype for Pp Purple flowers

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Asexual or Sexual Reproduction Q: Usually allows for quicker adaptation to changes in the environment A: Sexual reproduction

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Mitosis or Meiosis Starts with one cell with a full set of chromosomes, result is four cells each with a half set of chromosomes Meiosis

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds For seed shape-what is the genotype for homozygous dominant plant RR

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds Tallness in plants: what is the genotype for a heterozygous plant Tt

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Mitosis or Meiosis Starts with one cell with a full set of chromosomes, result is two cells each with a full set of chromosomes Mitosis

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds Cross a heterozygous purple flower plant vs. a white flowered plant. What are the genotypes and phenotypes of the offspring? Pp pp Pp pp P p p p Genotypes: Pp, pp Phenotypes: Purple, White

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds Flower color- genotype for a heterozygous plant Pp

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds Plant height- genotype for a short plant tt

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Asexual or Sexual Reproduction Q: Produces genetic variation A: Sexual reproduction

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Mitosis or Meiosis Splits the number of chromosomes in a cell in half Meiosis

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds Flower color what is the phenotype for pp white flowers

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Asexual or Sexual Reproduction Q: Usually produces large numbers of offspring quickly A: Asexual reproduction

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds Cross a heterozygous plant vs a homozygous dominant tall plant. What are the genotypes and phenotypes of the offspring? TT Tt T T T t Genotypes: TT, Tt Phenotypes: all tall

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds For seed shape-what two genotypes would result in round seeds RR, Rr

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Some Pea Plant Alleles: Pea plants T-tall plants t-short plants P-purple flowers p-white flowers R-round seeds r-wrinkled seeds Cross a heterozygous round plant vs a heterozygous round plant. What are the genotypes and phenotypes of the offspring? RR Rr rr R r R r Genotypes: RR, Rr, rr Phenotypes: First two are Round, last one is wrinkled