Download Mendel PowerPoint

Std. 10.4 In sexually
reproducing organisms,
each offspring contains a
mix of characteristics
inherited from both
parents.
D 37. Use the Punnett square
technique to predict the
distribution of traits in monoand di-hybrid crossings.
Learning Target:
Principles of Heredity
I Can…Explain the foundation
principles of Mendelian Genetics
I know I am successful when I can…
• Briefly describe Mendel’s contribution
• Describe Mendel’s experimental design
• Describe Mendel’s conclusions and Law of
Segregation
All started with Austrian monk
Gregor Mendel in the 1800s.
Mendel showed that:
• Traits are inherited as discrete units.
• Laid groundwork of genetics
• Demonstrated patterns of
inheritance
Mendel used purebred, self-pollinating pea
plants with a selection of
• “either / or” traits including:
• Pea shape, pea color, pod shape, pod color,
plant height, flower color, and flower
position.
Mendel’s Experimental Design:
• Use of self-pollinating pea plants
• Can control reproduction of plants
• Reproduce quickly
• Self-pollination creates genetically “pure”
genetic lines
• “Either / Or” Traits
• Only two allele versions for each trait studied
• No blending of traits
• Dominant v. Recessive
• Good scientific method (controlled variables
and one I.V.)
• Many trials / reproduced results (validity)
Mendel’s Experimental Design:
Cross – mating of two organisms
• P1 – Parental generation
• F1 – First Filial (first offspring)
generation
• F2 – Generation produced from F1
Mendel’s Experimental Design:
Cross – mating of two organisms
• P1 – Parental generation
• F1 – First Filial (first offspring)
generation
• F2 – Generation produced from F1
Mendel’s Conclusions:
Law of Segregation:
• Organisms donate only one copy of
each gene in the gametes (haploid) to
their offspring
• Genes segregate or separate during
meiosis
• Remember the process of meiosis
segregates only one of each
chromosome into each of the
gametes