11-1 the work of gregor mendel pg. 263. a. gregor mendel’s peas 1. genetics is the scientific...
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11-1 The Work of Gregor Mendel
Pg. 263
A. Gregor Mendel’s Peas
• 1. Genetics is the scientific study of inheritance.
Listen to this story…..
• Once upon a time there were two cute white bunnies in the wild.
• The two bunnies fell in love and had many baby bunnies.
• …..but there was one thing that could not be explained….
Listen to this story…..
• …where did the gray bunny come from?
A. Gregor Mendel’s Peas
• 2. Mendel, an Austrian monk, studied genetics using pea plants.
A. Gregor Mendel’s Peas
• 3. Pea plants undergo fertilization (joining of male and female reproductive cells) when pollen (male reproductive cells) joins the female reproductive cells in the ovaries.
A. Gregor Mendel’s Peas
• 4. The pea plants at Mendels Monastery were true-breeding, allowed to self-pollinate, producing identical copies.
A. Gregor Mendel’s Peas
• Mendel wondered what would happen if he pollinated two different plants?
B. Genes and Dominance
• 1. Mendel studied 7 traits.• 2. Traits are specific characteristics that vary
from one individual to another. – Examples: Plant Color, Plant Height, Seed Texture
Activity Break!
• Identify which of the following 10 human traits you have by placing a check mark beside that trait.
• Compare the traits you have with other students in the classroom.
• FIRST, lets predict which traits are MOST common!
• Tongue Roller• Non-Tongue Roller• • Attached Earlobes• Unattached earlobes• • Dimples• No Dimples• • Right-handed• Left-Handed• • Widow's Peak• Straight Hairline
Left Thumb on top when Hands Crossed
• Right Thumb on top when Hands Crossed
• • Hair on mid-digit of hand• No hair on mid-digit of hand• • Bent little finger• Straight little finger• • Second toe longer than big toe• Second toe not longer than big
toe
B. Genes and Dominance
• 3. P= Parental Generation F= Filial Generation• 4. Offspring from parents with different traits
are called hybrids.
B. Genes and Dominance
• 5. The hybrids Mendel produced, surprisingly, only showed the traits of one of the parents.
B. Genes and Dominance
• 6. Mendel concluded that traits were passed on as units, called genes, that come in two forms, called alleles.
B. Genes and Dominance
• 7. The law of dominance states that some alleles are dominant and some alleles are recessive.
C. Segregation
• Do the recessive alleles disappear?!?!?!• Mendel Tested that too!!!!
C. Law of Segregation
• 1. Mendel crossed Filial one (F1) plants to each other to produce Filial two (F2) plants.
C. Segregation
• 2. Mendel suggested that during gamete formation (MEIOSIS), the alleles separate into different cells.
C. Segregation
• 3. The law of segregation states that alleles segregate (separate) from each other so that each gamete only carries one copy of each gene.
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