heterozygous or homozygous dominant

For each of the following four genotypes, indicate in the answer sheet whether it is
heterozygous
,
homozygous dominant
,
or homozygous recessive
: (1 point total)
3.
Hh
4.
MM
5.
ff

of

3
11

6.
Make up your own heterozygous genotype, using a letter of your choice (1 point).
Part Three
The scientists noticed that the tarsiers of this particular island came in two varieties of fur color:
brown and silver. These colors are determined by the Fur gene, which has two possible alleles.
Comparing the fur phenotype with the genotype, they found that the uppercase ‘
F
’ allele codes
for brown fur while the lowercase ‘
f
’ allele codes for silver fur.
Based on this information, would the fur color of tarsiers with the following genotype be brown or
silver? (1 point total).

of

4
11
{ Caption: Photoshopped renditions of the silver and
brown tarsiers for this assignment. Real tarsiers do
have differences in fur color, though!}

7.
Ff
8.
ff
9.
FF
Part Four
Continuing their research, the primatologists temporarily capture a few tarsiers to observe over
a few days. Two of the captive tarsiers, one male and one female, are very fond of each other.
Looking at their DNA, scientists found that one has the genotype
FF
for the fur color gene and
the other tarsier has
ff
as its genotype. One of your fellow researchers, Jherry, is filling out a
Punnett square to diagram the possible genotypes of any offspring of this tarsier pair. He shows
you his template:
Jherry is eager to demonstrate what he learned when he took ANTH 101 last semester: “You
see, each parent’s genotype is given in the gray squares. With this information, we just move
the alleles for Parent 1 across each row and drop the alleles for Parent 2 down each column to
see how these alleles would combine in their offspring. For this pairing…”

of

5
11
Parent 2
F
F
Parent
1
f
f

Not to be outdone, you jump in to help Jherry figure out his Punnett square.
10.
What would be each offspring genotype in the four white blanks in the Punnett square? In
the answer sheet write the genotype derived from the parents in each white square. (1 point)
11.
What would be the fur color of all of these offspring, and why? Explain your reasoning with
at least a full sentence. (1 points)
One of the researchers, Lhindsay, comes back excitedly from the forest: “The two parent
tarsiers had a baby!” Being a top tarsier researcher, she already has a sample of the newborn’s
DNA to test. The results show that the offspring with the genotype
Ff
. Lhindsay’s mind reels
from the possibilities of this young tarsier. “What if the
Ff
baby grows up and mates with
another
Ff
tarsier?! What types of offspring are possible?” You work to answer Lhindsay’s question by
making another Punnett square. You start with the parents’ separated alleles in the gray
squares and then work to fill in the four white squares with the offspring’s genotypes:

of

6
11
Parent 2
Parent
1

12.
What would be in each of the white squares in the answer sheet showing the possible
genotypes of the grandchildren if the baby
Ff
tarsier grew up and mated with another
Ff
tarsier? (1 points)
13.
For each of the genotypes from question #12, what would be the resulting phenotype or
actual fur color? Fill in each the correct phenotype for each white square in the Punnett
Square with either the word ‘
brown
’ or ‘
silver
’ based on the genotype from #12. (1 points)

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