The image shows a flower that was produced by crossing a pure red flower with a pure white flower. Which do you think is the dominant petal color: red or w
... [Show More] hite? Explain.
I think the dominant petal color is red due to there being more red petals than white petals.
How is the inheritance pattern shown by this flower different from other inheritance patterns you have seen or studied?
The inheritance pattern shown is different from the other inheritance patterns I have studied. Because the typical inheritance pattern would only be one color, only white or only red. This pattern shows codominance with the red and white flower.
What is the red chicken's genotype?
FRFR
What is the white chicken's genotype?
FWFW
What do you think the letters F, R, and W stand for in the genotypes?
F for Feathers
R for Red
W for White
Predict: What do you think the offspring of a red chicken and a white chicken will look like?
The offspring would likely be a cross between the two colors. However, if there is a dominant color gene, such as white, the chicken will be white.
Observe: Click Breed. What are the offspring genotypes
FRFW
An organism's appearance is its phenotype. Describe the offspring's phenotype.
The offspring are red and white.
Experiment: Drag four offspring to the Holding Cages. Click Clear, and then drag one of the offspring to a parent box. Drag a white chicken to the other box. Click Breed several times.
Describe the resulting genotypes and phenotypes of the offspring.
All the resulted genotypes were FWFW.
Revise and Repeat: Click Clear. Drag another chicken from the Holding Cages to the parent box. Drag a red chicken to the other box. Click Breed several times.
Describe the resulting genotypes and phenotypes of the offspring.
The chickens have offspring of both red and red and white colored feathers. Sometimes the red feather gene is more dominant and results in all five offspring being red.
Explain: In dominant/recessive inheritance patterns, the dominant allele is always expressed when present. The recessive allele is onlyexpressed when the dominant allele is not present. Use your observations from this activity to describe how codominant inheritance patterns differ from dominant/recessive inheritance patterns.
Codominance refers to an inheritance type where both alleles of a particular gene are expressed in the phenotype.
Introduction: Probability is the likelihood that a specific event will occur. Scientists use probability to predict the outcomes of different genetic crosses.
Question: How can you use probability to predict the outcome of a codominant cross?
Model: A Punnett square is used to model the possible offspring genotypes from a genetic cross. The parent genotypes are written at the top and side of the square, as shown. The possible offspring genotypes are then filled in. The first square is filled in for you. Fill in the remaining squares. (Note: FR FW is equivalent to FW FR.)
FR
FW
FR
FRFR
FW
FR
FW
FR
FRFR
FRFW
FW
FWFR
FWFW
Are the parents homozygous or heterozygous? Explain how you know.
The parents are heterozygous, due to having two different alleles, which are the white and red colored feathers, rather than just one solid colored feather.
What are the possible genotypes of the offspring?
FRFW, FRFR, FWFW
Will the offspring be homozygous or heterozygous?
The offspring would be heterozygous since the parents are both heterozygous. [Show Less]
