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Overarching Question: Why are
organisms different from one
another?
Guiding Question: How can we
predict our inherited traits using
Punnett Squares?
Topic: Genetics Vocab.
 Questions:
Page 49
Notes:
Heredity: the passing of traits
from parents to offspring
Dominant: (Stronger) the trait
that shows up the most
Recessive: the trait that shows
up, but only sometimes
Punnett Square: a tool used to
predict traits
Page 49
Topic: Genetics Vocab.
 Questions:  Notes:
Page 49
 Genotype: the genetic code; AA, Aa, aa
 Phenotype: the physical trait that shows
up as a result of a genotype
 Heterozygous: “hetero” means different
When 2 alleles for a trait are different (Aa)
Hybrid
 Homozygous: “homo” means same
When 2 alleles for a trait are the same
(AA, aa)
Purebred
Page 49
Punnett Square and Probability:
 The Punnett square
shows the possible Alleles:
ways alleles could B = black fur
combine in the
b = brown fur
offspring of two
guinea pigs. Each
parent has one
dominant allele for
black fur (B) and one
recessive allele for
brown fur (b).
Punnett Square and Probability:
 The table shows the
probability of
genotypes and
phenotypes from the
Punnett square.
Genotype
Ratio
Percentage Phenotype
Ratio
Percentage
BB
1:4
25%
3:4
75%
Bb
2:4
50%
Black
Fur
bb
1:4
25%
Brown fur
1:4
25%
Genetics & Garden Peas
 Scenario:
 Create a genotype –
 One of the traits
trait
–
phenotype
Mendel observed
chart on p. 50 of your
was seed shape.
science notebook.
The seeds were
either round or
Genotype
Phenotype
Trait
wrinkled. Mendel
D:
observed that
rounds seeds were R:
dominant over
wrinkled seeds.
Genetics & Garden Peas
 Create and complete
a Punnett square on
p. 50 of your science
notebook to show the
possible offspring of
two heterozygous
pea plants.
R
R
r
r
Genetics & Garden Peas

Answer the questions on p. 50 of your science notebook:
1.
2.
3.
What two seed shapes did Mendel observe?
What was the phenotype for both parents?
What percentage of possible offspring had the
same genotype as the parents?
What percentage of possible offspring were
homozygous?
What percentage of possible offspring were
round? Wrinkled?
What was the genotype that did not share the
parents phenotype?
4.
5.
6.
What Are The Chances?
Genotype
 Bill is heterozygous D:
for hitchhiker thumb R:
which is dominant.
His wife Susie is
homozygous
recessive. What are
the chances of them
having a baby with
hitchhiker thumb?
Trait
Phenotype
What Are The Chances?
 Joe is homozygous Genotype
dominant for an
D:
indented chin. Molly R:
is homozygous
recessive for the
same trait. What is
the probability of them
having a child with an
indented chin?
Trait
Phenotype
What Are The Chances?
 Fred and Lori are Genotype
both heterozygous D:
for tongue rolling. R:
Can they have
children that can roll
their tongues? What
are the chances of
having a baby that
can’t roll it’s tongue?
Trait
Phenotype
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