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Patterns of inheritance and principles of heredity. Monohybrid crossing. The
Содержание
- 1. Patterns of inheritance and principles of heredity. Monohybrid crossing. The
- 2. Gregor Johann MendelAustrian monkStudied the inheritance of
- 3. Gregor Johann MendelBetween 1856 and 1863, Mendel
- 4. Genetic TerminologyTrait - any characteristic that can
- 5. Types of Genetic CrossesMonohybrid cross - cross
- 6. Punnett SquareUsed to help solve genetics problemscopyright cmassengale
- 7. Designers - “Genes”Alleles - two forms of
- 8. Genotype - gene combination for a trait.
- 9. Genotype & Phenotype in FlowersGenotype of alleles:
- 10. GenotypesHomozygous genotype - gene combination involving 2
- 11. Monohybrid Crossescopyright cmassengale
- 12. Trait: Seed ShapeAlleles: R – Round r –
- 13. P1 Monohybrid Cross ReviewHomozygous dominant x Homozygous
- 14. Trait: Seed ShapeAlleles: R – Round r –
- 15. F1 Monohybrid Cross ReviewHeterozygous x heterozygousOffspring: 25%
- 16. What Do the Peas Look Like?copyright cmassengale
- 17. Mendel’s 1st Lawcopyright cmassengale
- 18. Law of Dominance In a cross of
- 19. Law of Dominancecopyright cmassengale
- 20. Female Carrierscopyright cmassengale
- 21. Genetic Practice Problemscopyright cmassengale
- 22. Breed the P1 generationtall (TT) x dwarf (tt) pea plantscopyright cmassengale
- 23. Solution:tall (TT) vs. dwarf (tt) pea plantscopyright cmassengale
- 24. Breed the F1 generationtall (Tt) vs. tall (Tt) pea plantscopyright cmassengale
- 25. Solution:tall (Tt) x tall (Tt) pea plantscopyright cmassengale
- 26. Thank you friendscopyright cmassengale
- 27. Скачать презентанцию
Gregor Johann MendelAustrian monkStudied the inheritance of traits in pea plants.Developed the laws of inheritance.Mendel's work was not recognized until the turn of the 20th century.copyright cmassengale
Слайды и текст этой презентации
Слайд 1Patterns of inheritance and principles of heredity.Monohybrid crossing.The first law
of Mendel.
Слайд 2Gregor Johann Mendel
Austrian monk
Studied the inheritance of traits in pea
plants.
Developed the laws of inheritance.
Mendel's work was not recognized until
the turn of the 20th century.copyright cmassengale
Слайд 3Gregor Johann Mendel
Between 1856 and 1863, Mendel cultivated and tested
some 28,000 pea plants.
He found that the plants' offspring retained
traits of the parents.Called the “Father of Genetics“.
copyright cmassengale
Слайд 4Genetic Terminology
Trait - any characteristic that can be passed from
parent to offspring.
Heredity - passing of traits from parent to
offspring. Genetics - study of heredity.
copyright cmassengale
Слайд 5Types of Genetic Crosses
Monohybrid cross - cross involving a single
trait
e.g. flower color.
Dihybrid cross - cross involving two
traits.
e.g. flower color & plant height.copyright cmassengale
Слайд 7Designers - “Genes”
Alleles - two forms of a gene (dominant
& recessive).
Dominant - stronger of two genes expressed in
the hybrid; represented by a capital letter (R). Recessive - gene that shows up less often in a cross; represented by a lowercase letter (r).
copyright cmassengale
Слайд 8Genotype - gene combination for a trait. (e.g. RR, Rr,
rr)
Phenotype - the physical feature resulting from a genotype.
(e.g. red, white) copyright cmassengale
Слайд 9Genotype & Phenotype in Flowers
Genotype of alleles:
R = red flower
r
= yellow flower
All genes occur in pairs, so 2 alleles
affect a characteristicPossible combinations are:
Genotypes RR Rr rr
Phenotypes RED RED YELLOW
copyright cmassengale
Слайд 10Genotypes
Homozygous genotype - gene combination involving 2 dominant or 2
recessive genes (e.g. RR or rr); also called pure.
Heterozygous
genotype - gene combination of one dominant & one recessive allele. (e.g. Rr); also called hybrid.copyright cmassengale
Слайд 12Trait: Seed Shape
Alleles: R – Round r – Wrinkled
Cross: Round seeds
x Wrinkled seeds
RR x rr
P1 Monohybrid
CrossR
R
r
r
Rr
Rr
Rr
Rr
Genotype: Rr
Phenotype: Round
Genotypic
Ratio: All alike
Phenotypic
Ratio: All alike
copyright cmassengale
Слайд 13P1 Monohybrid Cross Review
Homozygous dominant x Homozygous recessive
Offspring all Heterozygous
(hybrids)
Offspring called F1 generation
Genotypic & Phenotypic ratio is ALL ALIKE
copyright
cmassengale
Слайд 14Trait: Seed Shape
Alleles: R – Round r – Wrinkled
Cross: Round seeds
x Round seeds
Rr x Rr
F1 Monohybrid
CrossR
r
r
R
RR
rr
Rr
Rr
Genotype: RR, Rr, rr
Phenotype: Round &
wrinkled
Gen. Ratio: 1:2:1
Phen. Ratio: 3:1
copyright cmassengale
Слайд 15F1 Monohybrid Cross Review
Heterozygous x heterozygous
Offspring:
25% Homozygous dominant RR
50% Heterozygous
Rr
25% Homozygous Recessive rr
Offspring called F2 generation
Genotypic ratio is 1:2:1
Phenotypic
Ratio is 3:1copyright cmassengale
Слайд 18Law of Dominance
In a cross of parents that are
pure for contrasting traits, only one form of the trait
will appear in the next generation.All the offspring will be heterozygous and express only the dominant trait.
RR x rr yields all Rr (round seeds)
copyright cmassengale
