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(Solved) Homework 7 Assignment: Punnett Squares and Dihybrid Crosses Punnett Squares Complete the following by: Filling out the punnett square 2. Describing...


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Homework 7
Assignment: Punnett Squares and Dihybrid Crosses
Punnett Squares
Complete the following by:
1. Filling out the punnett square
2. Describing each possible phenotype
3. Listing the probability for each genotype
Note: remember that CAPITAL LETTER signifies a dominant trait and a lower case
letter signifies a recessive trait.
Example) A green pea plant (GG) is being crossed with a green pea plant (Gg).
G G G GG GG g Gg Gg Phenotype= 4 green, 0 other color
Genotype Ratio= 50% GG, 50% Gg
1) GRADED: A green pea plant (Gg) is crossed with a yellow pea pant (gg). Gg Gg gg gg Phenotype 2 green 2 yellow
Genotype 50%Gg 50%gg
2) GRADED: A tall plant (TT) is crossed with a tall plant (Tt).
TT Tt Tt tt Two-Factor Crosses (Di-hybrid)
STEP 1: Determine what kind of problem you are trying to solve.
STEP 2: Determine letters you will use to specify traits.
STEP 3: Determine parent’s genotypes.
STEP 4: Make your punnett square and make gametes
STEP 5: Complete cross and determine possible offspring.
STEP 6: Determine genotypic and phenotypic ratios.
Example) A tall green pea plant (TTGG) is crossed with a short white pea plant
(ttgg).
TT or Tt = tall tt = short GG or Gg = green TG TG TG tg TtGg TtGg TtGg TtGg tg TtGg TtGg TtGg TtGg tg TtGg TtGg TtGg TtGg tg TtGg TtGg TtGg TtGg gg = white TG Phenotypic Ratio= 16 Tall/Green : 0 Tall/White : 0 Short/Green : 0 Short/ White
Genotypic Ratio = 16 TtGg
1) GRADED: A tall green pea plant (TTGg) is crossed with a tall green pea plant (TtGg)
____TTGg_______ X ______TtGg_____ TTGG TTGg TtGG TtGg TTGg TTGg TtGg TtGg TTGg TTGg TtGg TtGg TTGg
TTgg
____
Short/Green : ____ Short/ White TtGg Ttgg Tall/Green : ____ Tall/White : ____ 2) GRADED: A tall green pea plant (TtGg) is crossed with a Short white pea plant
(ttgg).
___________ X ___________ ____ Tall/Green : ____ Tall/white : ____ short/Green : ____ short/ white EVERYTHING BEYOND THIS POINT IS NOT GRADED BUT ADDITIONAL WORK IF YOU
WOULD LIKE MORE PRACTICE.
A tall plant (Tt) is crossed with a short plant (tt). A red flower (Rr) is crossed with a white flower (rr). A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is
the recessive color). Two heterozygous white (brown fur is recessive) rabbits are crossed. A heterozygous white rabbit is crossed with a homozygous black rabbit. A Homozygous tall, green flowered plant is crossed with a Homozygous short white
flowered plant.
___________ X ___________ ____ Tall/green : ____Tall/White : ____ Short/green: ____ Short/White Two Heterozygous Tall, Green pea plants are crossed. ___________ X ___________ ____ Tall/Green : ____ Tall/White : ____ Short/Green : ____ Short/ White In man, assume that spotted skin (S) is dominant over non-spotted skin (s) and that wooly
hair (W) is dominant over non-wooly hair (w). Cross a marriage between a heterozygous
spotted, non-wooly man with a heterozygous wooly-haired, non-spotted woman. Give
genotypic and phenotypic ratios of offspring. In horses, black is dependent upon a dominant gene, B, and chestnut upon its recessive
allele, b. The trotting gait is due to a dominant gene, T, the pacing gait to its recessive allele,
t. If a homozygous black pacer is mated to a homozygous chestnut trotter, what will be the
appearance of the F1 generation? In summer squash, white fruit color (W) is dominant over yellow fruit color (w) and diskshaped fruit (D) is dominant over sphere-shaped fruit (d).. If a squash plant true-breeding
for white, disk-shaped fruit is crossed with a plant true-breeding for yellow, sphere-shaped
fruit, In mice, the ability to run normally is a dominant trait. Mice with this trait are called
running mice (R). The recessive trait causes mice to run in circles only. Mice with this trait
are called waltzing mice (r). Hair color is also inherited in mice. Black hair (B) is dominant
over brown hair (b).For each of the following problems, determine the parent genotypes,
determine possible gametes then construct a Punnet square to solve.
a. Cross a heterozygous running, heterozygous black mouse with a homozygous running,
homozygous black mouse
Parental genotypes ______________
Possible gametes _____ _____ _____ _____
Offspring phenotypic ratio ________________ b. Cross a homozygous running, homozygous black
mouse with a heterozygous running, brown
mouse
Parental genotypes ______________
Possible gametes _____ _____ _____ _____
Offspring phenotypic ratio ________________ c. Cross a waltzing brown mouse with a waltzing brown mouse
Parental genotypes ______________
Possible gametes _____ _____ _____ _____
Offspring phenotypic ratio ________________ d. Cross a homozygous running, heterozygous black mouse with a waltzing brown mouse
Parental genotypes ______________
Possible gametes _____ _____ _____ _____
Offspring phenotypic ratio ________________ e. Cross a heterozygous running, brown mouse with a heterozygous running, homozygous
black
mouse
Parental genotypes ______________
Possible gametes _____ _____ _____ _____
Offspring phenotypic ratio ________________ f. Cross a heterozygous running, heterozygous black mouse with a heterozygous running,
heterozygous black mouse Parental genotypes ______________
Possible gametes _____ _____ _____ _____
Offspring phenotypic ratio ________________

 


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