Transcript Day 1 - Jefferson School District

Day 1
In rabbits the allele for black coat color (B) is dominant over
the allele for brown coat (b). What is the genotype ratio
and phenotype ratio from a cross between a heterozygous
rabbit for black coat and one homozygous for brown coat?
What does dominant mean?
A genetic factor that blocks another.
What does heterozygous mean?
Alleles are different
What does homozygous mean?
Alleles are the same
What would be the heterozygous
alleles?
Bb
What would be the homozygous
alleles?
bb or BB
In rabbits the allele for black coat color (B) is dominant over
the allele for brown coat (b). What is the genotype ratio
and phenotype ratio from a cross between a heterozygous
rabbit for black coat and one homozygous for brown coat?
B = Black coat
b = brown coat
Bb x bb
B
b Bb
b Bb
b
Genotype:
Bb = 50%
bb = 50%
bb
bb
Phenotype:
Black coat = 50%
Brown coat = 50%
Day 2:
The Punnett square below is for a cross between two fruit
flies. In fruit flies, the long-wing trait (L) is dominant to the
short-wing trait (l). Classify each offspring as homozygous or
heterozygous for the trait. Describe the phenotypes of the
offspring.
LL
Homozygous:______
Ll
Heterozygous: _______
L
L
long wings
LL = __________________
long wings
Ll
=
___________________
L LL
LL
What is the % of having long
100%
wings? __________
l Ll
Ll
What is the % of having short
0%
wings? __________
Day 1:
Day 1:
In rabbits the allele for black coat color (B) is dominant over the
allele for brown coat (b). What is the genotype ratio and phenotype
ratio from a cross between a heterozygous rabbit for black coat and
one homozygous for brown coat?
In rabbits the allele for black coat color (B) is dominant over the
allele for brown coat (b). What is the genotype ratio and phenotype
ratio from a cross between a heterozygous rabbit for black coat and
one homozygous for brown coat?
What does dominant mean?
What does dominant mean?
What does heterozygous mean? ________
What does homozygous mean? _________ or ________
What would be the heterozygous alleles? ________
What would be the homozygous alleles? ________
What is the parent cross _______ x __________
What does heterozygous mean? ________
What does homozygous mean? _________ or ________
What would be the heterozygous alleles? ________
What would be the homozygous alleles? ________
What is the parent cross _______ x __________
Genotype:
Genotype:
Phenotype:
Phenotype:
Day 2:
Day 2:
The Punnett square below is for a cross between two fruit flies. In
fruit flies, the long-wing trait (L) is dominant to the short-wing trait
(l). Classify each offspring as homozygous or heterozygous for the
trait. Describe the phenotypes of the offspring.
The Punnett square below is for a cross between two fruit flies. In
fruit flies, the long-wing trait (L) is dominant to the short-wing trait
(l). Classify each offspring as homozygous or heterozygous for the
trait. Describe the phenotypes of the offspring.
L
L
L
LL
LL
l
Ll
Ll
Homozygous:______
Heterozygous: _______
LL = __________________
Ll = ___________________
What is the % of having long
wings? _________
What is the % of having short
wings? ________
L
L
L
LL
LL
l
Ll
Ll
Homozygous:______
Heterozygous: _______
LL = __________________
Ll = ___________________
What is the % of having long
wings? _________
What is the % of having short
wings? ________