Amoeba sisters video recap asexual and sexual reproduction answer key
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AMOEBA SISTERS: VIDEO RECAP
Amoeba Sisters Video Recap: Pedigrees
Autosomal Recessive Pedigree
Directions: Consider a pedigree that is tracking an autosomal recessive trait, where two recessive alleles (tt) result
in the inability to taste a chemical known as PTC. The ability to taste PTC is determined by the presence of a
dominant allele (T). Complete the missing boxes in the chart. The first row has been done for you as an example
"Note: The ability to taste PTC may be more complex than a simple gene trait.
Male with genotype TT
Male with genotype Tt
Male with genotype tt
Female with genotype TT
Female with genotype Tt
Female with genotype tt
Shape (in Pedigree)
Design an Autosomal Recessive Pedigree!
A couple with the ability to taste PTC have two grown sons and one grown daughter. The sons have the ability to
taste PTC. Their daughter is a PTC non-taster. She married a PTC non-taster man, and they have two sons.
Draw a pedigree in the box on the right that fully
represents the above scenario and tracks the inability to
taste PTC (non-taster), which is caused by two recessive "t"
alleles. In your illustrated pedigree, please make sure that:
(A) generations are listed as Roman numerals and
the individuals are numbered.
(B) the correct shapes for males and females are
(C) the shapes that require shading are shaded.
(D) the genotypes are listed next to each pedigree
17. What is the phenotype of the sons in generation III? How do you know?
Sex-linked traits that are tracked in pedigrees are typically on the X chromosome. Assume the following questions
refer to colorblindness, which is a sex-linked recessive trait on the X chromosome.
18. Circle the genotype(s) that represent(s) a female with the sex-linked recessive trait.
XX XX XX X'Y XY
19. Circle the genotype(s) that represent(s) a male with the sex-linked recessive trait.
XX XX XX* XºY XY
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