Download Genetic Problems Packet Part 1

Genetic Problems Packet #1:
Show all work in pencil
NAME: _________________________
HOUR: ______________
Objective: By working through these problems, and asking for help when necessary, you will be able to accurately determine the
probabilities of offspring traits for all types of genetic crosses.
**PART ONE
Complete the table below to organize the rules for Punnett Squares for different types of alleles.
Type of Inheritance
Letters to represent alleles
Heterozygote Phenotype
Dominant and Recessive
Alleles
Codominant Alleles
Incompletely dominant
alleles
1.
2.
3.
For each genotype below, indicate whether it is heterozygous (He) or homozygous (Ho).
AA ________
Ee ________
Ii ________
Mm ________
Bb ________
ff ________
Jj ________
nn ________
Cc ________
Gg ________
kk ________
oo ________
DD ________
HH ________
LL ________
Pp ________
For each of the genotypes below, determine what phenotypes would be possible:
Purple flowers are dominant to white flowers
Brown eyes are dominant to blue eyes
PP ______________________________
BB ______________________________
Pp ______________________________
Bb ______________________________
pp ______________________________
bb ______________________________
For each phenotype below, list the genotypes that are possible:
Straight hair is dominant to curly hair
4.
Pointed heads are dominant to round heads
________________ straight
_________________ pointed
________________ curly
_________________ round
Set up the Punnett squares for each of the crosses listed below. Consider that round seeds are dominant to wrinkled seeds.
Rr x rr
What percentage of the offspring will be round?
_______________________________
RR x Rr
What percentage of the offspring will be round?
_______________________________
Rr x Rr
What percentage of the offspring will be round?
_______________________________
5.
Red is dominant to white in petunias (flowers). Cross a homozygous
dominant petunia with a homozygous recessive petunia.
Alleles =
Parental genotypes =
F1 genotype(s) =
F1 phenotype(s) =
6.
Cross two offspring from the F1 generation from question number 5.
Alleles =
Parental genotypes =
F1 genotype(s) =
F1 phenotype(s) =
7.
Black and white are both dominant traits in Huskies (a type of dog).
Cross a black Husky with a white Husky.
Alleles =
Parental genotypes =
F1 genotype(s) =
F1 phenotype(s) =
8.
Red and white are neither dominant nor recessive in Japanese 4 O’Clock Flowers.
Cross two pink flowers.
Alleles =
Parental genotypes =
F1 genotype(s) =
F1 phenotype(s) =
** PART TWO (anything goes, these will not follow a
specific order…you need to figure them out)
11. Polycystic Kidney Disease is recessive in humans.
Cross two heterozygous parents.
9.
Identify alleles:
In cichlid fish, red and yellow are incompletely
dominant. Cross an orange fish with a red fish.
Identify alleles:
Parent cross:
Parent cross:
F1 genotypes:
F1 genotypes:
F1 phenotypes:
F1 phenotypes:
12. In deer, brown and grey are codominant. Cross two
deer that have roan fur.
Identify alleles:
10. In cats, the allele for folded ears is recessive and the
allele for pointed ears is dominant. Cross a
heterozygous pointed ear cat with a cat with folded ears.
Parent cross:
Identify alleles:
F1 genotypes:
Parent cross:
F1 phenotypes:
F1 genotypes:
13. In ocelots, yellow eyes are incompletely dominant with
blue eyes. Cross a yellow eyed ocelot with a blue eyed
ocelot.
Identify alleles:
F1 phenotypes:
Parent cross:
F1 genotypes:
F1 phenotypes:
14. In black eyed susan flowers, yellow and orange color
alleles are codominant. If you cross an orange flower
with a flower that is yellow and orange streaked. Cross
an orange and a yellow black eyed susan.
17. In domestic cats, white spots are dominant over no
white spots. Cross two heterozygous cats.
Identify alleles:
Identify alleles:
Parent cross:
Parent cross:
F1 genotypes:
F1 genotypes:
F1 phenotypes:
F1 phenotypes:
15. In cats, the striped pattern is dominant to the swirled
pattern. Cross a heterozygous cat with a cat that has
swirled fur.
18. In ring tailed lemurs, long tail is incompletely dominant
with short tail. Cross a medium tailed lemur with a long
tailed lemur.
Identify alleles:
Identify alleles:
Parent cross:
Parent cross:
F1 genotypes:
F1 genotypes:
F1 phenotypes:
F1 phenotypes:
16. In hammerhead sharks, the extended head allele is
dominant over the normal shaped head. Cross a
homozygous dominant shark with a hammerhead that
doesn’t have a hammerhead.
Identify alleles:
Parent cross:
F1 genotypes:
F1 phenotypes: