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Understanding Monohybrid Cross: Alleles, Dominant vs. Recessive Traits

Explore the concept of monohybrid cross and inheritance of one trait in genetics. Learn about alleles, dominant and recessive traits, homozygous, heterozygous, genotype, and phenotype.

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Understanding Monohybrid Cross: Alleles, Dominant vs. Recessive Traits

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  1. THE MONOHYBRID CROSS FOLLOWING THE INHERITANCE OF ONE TRAIT

  2. TODAY’S BIG WORDS • MONOHYBRID • ALLELE • DOMINANT • RECESSIVE • HOMOZYGOUS • HETEROZYGOUS • GENOTYPE • PHENOTYPE

  3. CROSSING TWO PLANTS TALL X SHORT PARENTS ALL TALL OFFSPRING

  4. TODAY’S BIG WORDS • MONOHYBRID – Following one trait • ALLELE • DOMINANT • RECESSIVE • HOMOZYGOUS • HETEROZYGOUS • GENOTYPE • PHENOTYPE

  5. ADD THE SYMBOLISM TALL X SHORT PARENTS TT tt ALL TALL OFFSPRING Tt

  6. EGGS AND POLLEN??? TALL X SHORT PARENTS TT tt T GAMETES t ALL TALL OFFSPRING Tt

  7. TODAY’S BIG WORDS • MONOHYBRID – Following one trait • ALLELE – One form of a gene • DOMINANT • RECESSIVE • HOMOZYGOUS • HETEROZYGOUS • GENOTYPE • PHENOTYPE

  8. TODAY’S BIG WORDS • MONOHYBRID – Following one trait • ALLELE – One form of a gene • DOMINANT – Trait that always shows up • RECESSIVE • HOMOZYGOUS • HETEROZYGOUS • GENOTYPE • PHENOTYPE

  9. TODAY’S BIG WORDS • MONOHYBRID – Following one trait • ALLELE – One form of a gene • DOMINANT – Trait that always shows up • RECESSIVE – Trait that can hide • HOMOZYGOUS • HETEROZYGOUS • GENOTYPE • PHENOTYPE

  10. THE PUNNETT SQUARE

  11. THE PUNNETT SQUARE

  12. THE PUNNETT SQUARE

  13. TODAY’S BIG WORDS • MONOHYBRID – Following one trait • ALLELE – One form of a gene • DOMINANT – Trait that always shows up • RECESSIVE – Trait that can hide • HOMOZYGOUS – Has the same alleles • HETEROZYGOUS • GENOTYPE • PHENOTYPE

  14. TODAY’S BIG WORDS • MONOHYBRID – Following one trait • ALLELE – One form of a gene • DOMINANT – Trait that always shows up • RECESSIVE – Trait that can hide • HOMOZYGOUS – Has the same alleles • HETEROZYGOUS – Has different alleles • GENOTYPE • PHENOTYPE

  15. CROSSING TWO OFFSPRING TALL X TALL PARENTS ??????? OFFSPRING

  16. EGGS AND POLLEN??? TALL X TALL PARENTS Tt Tt T t GAMETES T t

  17. POTENTIAL FOR DIFFERENT OFFSPRING TALL X TALL PARENTS Tt Tt T t GAMETES T t OFFSPRING TT TALL

  18. POTENTIAL FOR DIFFERENT OFFSPRING TALL X TALL PARENTS Tt Tt T t GAMETES T t OFFSPRING Tt TALL

  19. POTENTIAL FOR DIFFERENT OFFSPRING TALL X TALL PARENTS Tt Tt T t GAMETES T t OFFSPRING tt SHORT

  20. THE PUNNETT SQUARE

  21. THE PUNNETT SQUARE

  22. TODAY’S BIG WORDS • MONOHYBRID – Following one trait • ALLELE – One form of a gene • DOMINANT – Trait that always shows up • RECESSIVE – Trait that can hide • HOMOZYGOUS – Has the same alleles • HETEROZYGOUS – Has different alleles • GENOTYPE – GENE TYPE (the letters) • PHENOTYPE

  23. TODAY’S BIG WORDS • MONOHYBRID – Following one trait • ALLELE – One form of a gene • DOMINANT – Trait that always shows up • RECESSIVE – Trait that can hide • HOMOZYGOUS – Has the same alleles • HETEROZYGOUS – Has different alleles • GENOTYPE – GENE TYPE (the letters) • PHENOTYPE – WHAT IT LOOKS LIKE

  24. PHENOTYPES

  25. GENOTYPES

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