Transcript Slide 1

What are these confusing boxes
for?
• After studying his results, Mendel realized that in
order to get the results that he got,
• EACH PLANT HAD TO GET GENETIC
INFORMATION FROM EACH PARENT.
• This genetic information is called
• So, each different
trait…has a specific
gene that tells the
plant to grow that
way.
• Each different FORM
of the gene is called
an
But Mendel had a problem…
• He had to figure out how the different
interact.
• He knew which ones were
DOMINANT: the trait that appeared most
often
RECESSIVE: the trait that disappeared in
the 1st generation
So what did Mendel do?
• He removed the
anthers of one plant
and transferred pollen
from another plant to
the first one.
• The second time
around, he let the
new plants selfpollinate and grow
new plants.
• So another Reginald Punnett the scientist
who came up with the Punnett Square.
• He was able to visualize how the different
alleles combined to create a
or, the type of genes the offspring has.
The
determines the
Or, what the plant actually looks like.
So, this is how it works…
Each parent gives the offspring one half of it’s
traits…
Rr
Rr
Rr
Rr
For rabbits, the allele for black fur, B, is
dominant over the allele for white fur, b.
Suppose two black parents have four
bunnies -- 3 black and 1 white…
1. Create a Punnett Square to help you answer
the following questions.
2. What are the genotypes of the parents?
3. What are the possible genotypes of all four
siblings?