1. Mendelian Genetics

2. Genetics: The Scientific Study of Heredity
Mendel –Austrian Monk
Born 1822
Spent years studying science and mathematics
Worked at a Monastery and taught High School.
Also in charge of the monastery garden- This work is where Mendel developed his theories on Genetics

3. Sexual Reproduction
Mendel understood that pollen contained the male reproductive cells and that the female portion of the flower produces the egg.
When the male and female sex cells are joined together this is called fertilization and a seed is formed.

4. Pea Plants:
Pea plants can self-pollinate-meaning the pollen of a plant can fertilize the same flower (Inbreeding). This produces a seed with the same characteristics as the parent plant (true-breeding/homozygous).
These plants would produce only green seeds only yellow seeds, only tall seeds,etc

5. Cross-Pollination
Mendel wanted to produce seeds by joining male and female reproductive cells from different plants-so he dusted pollen from one plant on to another to cross-pollinate.
This can also be done naturally by pollinators such as bees.

6. Data/Observation Pollen Pictures Day 2 Lilium oriental
(+) control
After 120min
~100 µm
Pollen tube
Picture by Charles Beckius

8. Genes vs. Alleles

9. Genotype – the actual codes for a trait ex. BB,Bb,bb
Phenotype- the traits seen

10. Dominant vs. Recessive BB x bb = Bb
Principle of dominance states that some alleles are dominant and others are recessive.
Capitol Letters =dominant traits=if gene is present, trait will always be seen.
Lower case letter =recessive traits=hidden traits.
BB x bb = Bb

11. True-breeding/homozygous
BB or bb pure characteristics from having all the same alleles

12. Hybrids/heterozygous
The offspring of crosses between parents with different traits are called hybrids.
BB x bb = Bb
brown x blue
Hybrid brown

13. Traits Mendel studied 7 different pea plant traits.
Seed shape- round vs. wrinkled
Seed color – yellow vs. green
Seed coat color- gray vs. white
Pod shape- constricted vs smooth
Pod color green vs. yellow
Flower position – axial vs. terminal
Plant height- short vs. tall

14. + - haploid Diploid haploid haploid

15. Monohybrid cross

16. P-parent generation TT x tt
Mendel’s P, F1, and F2 Generations
P-parent generation TT x tt
T T t Tt Tt
Offspring of the P generation is
the F1 generation Tt Tt t
Cross the F1-1st filial generation
Tt x Tt
T t T TT Tt
To get the F2 “filial generation t Tt tt

17. MENDEL's first law is the principle of uniformity
MENDEL's first law is the principle of uniformity. It says that, if two plants that differ in just one trait are crossed, then the resulting hybrids will be uniform in the chosen trait.

18. MENDEL's second law is the principle of segregation
MENDEL's second law is the principle of segregation. It states that the individuals of the F2 generation are not uniform, but that the traits are segregated

19. MENDEL's third law is also called the principle of independent assortment. It says that every trait is inherited independently of the others and it thus covers the case that new combinations of genes can arise, which were not existing before. We know today that this principle is just valid in the case of genes that are not coupled, i.e. that are not located at the same chromosome.

20. MENDEL's 4th law is also called the principle of attraction
MENDEL's 4th law is also called the principle of attraction. It says that since every sperm and egg are polar and that since sperm are slightly positive and ova is slightly negative they are always attracted to each other. In addition some alleles are also polar which increase the combination of certain characteristics combining together. For example blonde hair and blue eyes are more likely to developed together since those alleles are polar opposites. However this only occurs if the alleles are not located at the same chromosome.

21. Incomplete Dominance

23. In-complete
dominance

24. Co-Dominance

25. Dihybrid Cross

26. iA iB io io

27. http://www. bioweb. uncc. edu/1110Lab/notes/notes1/images/lab7. h28

28. Sex-Linked Traits http://www.uni.edu/walsh/xlink2.gif

29. Pedigree