Transcript Slide 1

Mendel, First Geneticist
p. 66
Who Likes Peas?
Who Likes Peas?
• This guy, that’s who.
Table of Contents
12/9/13
Mendel, First Geneticist
66
Essential Question
• Who was Gregor Mendel, and how did he
discover the basis of heredity by breeding
pea plants?
Assignment
• Read pages D-34 – 38.
Stopping to Think 1
• What personal qualities do you think
Mendel must have had that helped him in
his work?
Mendel was devoted, persistent, and
patient. He was also devoted to science.
Stopping to Think 2
a) What were the advantages for Mendel in
using pea plants for his breeding
investigations?
Pea plants grow quickly, produce numerous
seeds, and have many observable
characteristics.
Stopping to Think 2
b) Why did Mendel perform so many
crosses for the same characteristics?
Mendel did many crosses to make sure that
his results were accurate.
Define “Recessive”
• The trait that is “hidden.” The opposite of
dominant.
*Recessive alleles only show up if there is
no dominant.
Example: Blue tails are
dominant, orange tails
are recessive.
Allele
• different forms of genes (represented by
letter)
• Example: The blue tail color allele.
The yellow seed color allele.
Stopping to Think 3
• Explain how the coin-tossing model we did
in class works exactly like Mendel’s
explanation for his results with pea plants.
The model is the same because there are
three possibilities for the dominant allele to
be expressed, and only one for the
recessive allele.