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Dominant Recessive Homozygous Heterozygous Punnett Squares ProbabilityMisc

What is the difference between incomplete dominance and codominance?

Incomplete dominance is a blend of the traits Codominance is where both traits show up in the phenotype

An allele whose trait always shows up in an organism is a allele. How is that represented?

A dominant allele always shows up. Represented by a capital letter

Height is controlled by polygenic inheritance. What does this mean?

Height is controlled by many genes

An allele whose trait does not always show up in an organism is a allele. How is this allele represented?

A recessive allele does not always show up in an organism. It’s represented by a capital letter

Black feathered chickens are codominant to white feathered chickens. What is the phenotype of the following… F B F W F B F W

F B F B = black feathers F W F W = white feathers F B F W = black and white feathers

Describe homozygous using the word allele.

A homozygous organism has two alleles that are either both dominant or both recessive.

Describe heterozygous using the word allele.

An organism that has one dominant and one recessive allele is heterozygous.

Is the following homozygous or heterozygous? Dominant or recessive? TT

Homozygous dominant

Perry the Platypus met Pinky the Platypus at the park. Perry is homozygous for his teal-green color. Pinky is heterozygous for her pink color. What are the genotypes of the parents? What is the probability of their children being pink? What is the probability of their children being teal green? What is the probability of their children being homozygous dominant? What is the probability of their children being homozygous recessive? What is the probability of their children being heterozygous?

Pink – 50% Teal green – 50% Homozygous dominant – 0% Homozygous recessive – 50% Heterozygous – 50%

How would you write the genotype for a heterozygous tall plant?

Tt

Complete the following Punnett Square. Tt t

T t t Tt tt

w 3 W What is the possibility of homozygous offspring?

ww W Ww Ww 0%

Cross a homozygous recessive short pea plant with a heterozygous tall pea plant? What is the probability of having pea plants with short phenotypes?

t t T Tt Tt t tt tt 50%

Cross a heterozygous tall plant with a homozygous tall plant. What is the probability of getting homozygous dominant offspring?

T t T TT Tt 50 %

Mrs. Lindahl has a widow’s peak, a dominant trait. Neither of her daughters have a widow’s peak. Does Mrs. Lindahl have a homozygous or heterozygous genotype for this trait?

?w W W? Ww w ?w ww Mrs. Lindahl’s daughter’s genotypes Mrs. Lindahl has to be Ww

If a snapdragon’s inheritance pattern is incomplete dominant, what is the probability that a white flower and a red flower will produce a red flower?

W R RW RW 0% chance of a red flowers

In pea plants, purple flowers are dominant to white. What is the probability that a heterozygous purple flower and a homozygous white flower will produce a white flower?

P p p Pp pp 50% chance of a white flower

What is the probability that a heterozygous tall flower and a homozygous tall flower will produce a short flower? Make a Punnett Square first.

Tt T TT Tt 0% chance of a short flower.

What is the probability that someone whose blood type is heterozygous A and someone who is blood type AB will have a baby who has blood type B?

I A i I A I A I A I A i I B I A I B I B i 25% chance

What would the parents need to be produce all babies with type O blood.

i i ii ii Both parents would need to be homozygous recessive or ii (blood type O)

What does genotype mean?

The allele combination - Example: TT, Tt, tt

What does phenotype mean?

Phenotype is the physical description of the organism. Example: tall, short, etc.

What can you use to determine the probability of a genotype occurring?

A Punnett Square.

What does hybrid mean?

A hybrid is an organism that has a dominant and recessive allele.

What does purebred mean?

A purebred organism has just one type of allele.