Vocabulary
Define phenotype.
An organism's physical appearance or visible traits that are expressed
Write a heterozygous genotype.
Aa
Gregor Mendel
Describe incomplete dominance.
When heterozygous offspring get a blended trait of the parents.
Describe codominance.
When both dominant alleles from a gene are expressed
Define genotype.
The gene combination for a trait. Written using capital and lower case letters.
The passing of traits from parent to offspring is called ____________.
In a heterozygous genotype, which allele is expressed?
dominate
Roan is a coat color found in many animals, including horses, cattle and dogs. It is defined generally as an even mixture of white and red hair. What is the chance of getting a roan calf you cross a roan bull and a roan cow
50%
One purebred black dog (BB) is bred with a purebred white dog (bb). The cross is co-dominant. What will the babies look like? (Bb)
both white and black
Write a homozygous recessive and homozygous dominate genotype.
aa - homozygous recessive
AA - homozygous dominate
B = Brown Eyes b= Blue Eyes
Cross the following parents to show the genotype and phenotype of the offspring.
BB x bb
Genotype= 100% Bb
Phenotype= 100% Brown eyes
When is a recessive allele expressed?
A red flower (RR) and a white flower (rr) are crossed. What will the offspring look like if the cross is incomplete dominance?
Pink
Which of the blood types is codominant?
Blood Type AB
A diagram used to show the genetic possibility of offspring is called a __________________.
Punnett Square
B = Brown eyes b = blue eyes
Cross a heterozygous father and a mother with blue eyes. Show all work.
Genotype: Bb= 50% bb= 50%
Phenotype: Brown Eyes= 50% Blue Eyes= 50%
What is the genotype "RR" describe as being
Homozygous dominate
In chickens, black individuals (B) and white individuals (W) are homozygous. A homozygous black chicken is crossed with a homozygous white chicken. What is the genotypes and phenotypes of the offspring.
Genotype: 100%= BW
Phenotype: 100% = Speckled Chickens
Blood type AB is crossed with a parent with Blood Type BO. What are the possible blood types of the offspring.
AB, BB, AO, BO
What is an allele? What two forms can it take?
Gene for a specific trait. Can be dominate or recessive.
B = Brown eyes b = blue eyes
Cross two heterozygous parents. Write the possible genotypes and phenotypes.
Phenotype:
75% brown eyes 25% blue eyes
Genotype:
Bb=50% BB=25% bb=25%
R = round r = wrinkled
A homozygous recessive and homozygous dominant pea plant are crossed. Write the possible genotypic and phenotypic possibilities.
Genotype: Rr=100%
Phenotype: Round=100%
In radishes, red (R) and white (W) are pure-breeding colors, while hybrids are purple (RW). If a red radish is crossed with a white radish, what will be the phenotype of the offspring? Show the Punnett Square and percentage of each phenotype.
RW - 100% purple
A man with type O blood has a child with a woman who has Type AB blood . What are the possible blood types of the children. Show the Punnett Square work and the percentages.
Blood Type A
Blood Type B