Name
Period
Directions:
 Go to the following website: http://www2.edc.org/weblabs/
(Note: You must open this in FireFox to run the program)
 Click on the microscope to enter the Directory of Web Labs
 Click on Incomplete Dominance & Codominance
 Answer the questions below as you complete each task
Date
LENTIL PLANTS
How many different alleles are there for see design in lentil
plants?
What happens when you cross a spotted lentil with a dotted
lentil?
Incomplete Dominance & Codominance Web Lab
PEA PLANTS
Given the information provided, which color pea plant is
dominant? Which is recessive?
Purple:
White:
Define each of the following terms:
Dominance
Given the genotypes below, what would the phenotypes be?
PP:
Pp:
Codominance
pp:
SNAPDRAGONS
How many different alleles are there for flower color in
snapdragons?
What happens when you cross a red snapdragon with a white
snapdragon?
What type of dominance does this demonstrate?
Incomplete
dominance
Which form of gene expression is evident in the examples listed
below: (Check one)
Human Blood Type
Fur Color in Rabbits
Horse Coat Color
Dominance
Codominance
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Incomplete
dominance
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Directions:
 Go back to the Web Lab Directory
 Click on Sex Determination & Linkage
 Answer the questions below as you complete each task
HEMOPHILIA
Explain why hemophilia is more common in males than in
females.
Sex Determination & Linkage
What are the sex chromosomes for the following genders?
Female:
Male:
During meiosis, how many sex cells are created?
What is the probability of being a male or a female?
Identify two traits that are carried on the X chromosome:
Like colorblindness, hemophilia is a recessive sex-link trait and
is designated in combination with sex chromosomes:
XH – X chromosome with normal clotting blood (dominant)
COLORBLINDNESS
What is the sex and phenotype for colorblindness for each of
the following genotypes:
Sex
XCXC
XCXc
Vision
Xh – X chromosome with hemophilia (recessive)
Y – Y chromosomes do not contain the genes for hemophilia
What genotypes would produce hemophilia in these genders?
Male:
Female:
XcXc
XCY
XcY
Tortoiseshell fur color
is a sex-linked trait and
is seen more often in
male cats.