What does dominant mean?

What does heterozygous mean?

What does homozygous mean?

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 would be the heterozygous alleles?

What would be the homozygous alleles?

A genetic factor that blocks another.

Alleles are different

Alleles are the same

Bb

bb or BB

Day 1

B = Black coatb = brown coat

Bb x 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 b

b

b

Genotype:Bb = 50%bb = 50%

Phenotype:Black coat = 50%Brown coat = 50%

Bb

Bb bb

bb

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.

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? __________

LL

Ll long wings long wings

100%

0%

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?

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 __________

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.

L L

L LL LL

l Ll Ll

Genotype:

Phenotype:

Homozygous:______Heterozygous: _______LL = __________________Ll = ___________________What is the % of having long wings? _________What is the % of having short wings? ________

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?

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 __________

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.

L L

L LL LL

l Ll Ll

Genotype:

Phenotype:

Homozygous:______Heterozygous: _______LL = __________________Ll = ___________________What is the % of having long wings? _________What is the % of having short wings? ________