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Life Science Unit Review

Life Science Unit Review. 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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Life Science Unit Review

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  1. Life Science Unit Review

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

  3. 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? P p P P Genotypes: PP, Pp Phenotypes: All Purple

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

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

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

  7. 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? T t T t Genotypes: TT, Tt, ttPhenotypes: First two are tall, last one is short

  8. 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

  9. Mitosis or Meiosis • Creates an exact copy of the original cell • Mitosis

  10. 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

  11. 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

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

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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? P p p p Genotypes: Pp, pp Phenotypes: Purple, White

  18. 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

  19. 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

  20. Asexual or Sexual Reproduction • Q: Produces genetic variation • A: Sexual reproduction

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

  22. 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

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

  24. 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? T T T t Genotypes: TT, TtPhenotypes: all tall

  25. 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

  26. 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? R r R r Genotypes: RR, Rr, rrPhenotypes: First two are Round, last one is wrinkled

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