Cartoons of the Day Cartoons of the Day Cartoons of the Day Cartoons of the Day Problem AW YEAH Threefourths 34 of the plants produced by a cross between two unknown pea plants have axial flowers and ¼ have terminal flowers What are the genotypes of the parent plants ID: 566627
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Slide1
Punnett Genetics
D
r
. Nichols
Coronado HSSlide2
Punnet Square
Created by Punnet
Used to predict possible outcomes of
crossesSlide3
Problem #1 (together)
Nn
x NN
Genotype ratio:Phenotype ratio:Slide4
Problem #2
Aa
x
aaGenotype ratio:Phenotype ratio:Slide5
Problem #3 (on your own)
Tt
x
TtGenotype ratio:Phenotype ratio:Slide6
Problem #4
Cross two plants that are heterozygous for green pods
Genotype ratio:
Phenotype ratio:Slide7
Problem #5
Cross a plant that is heterozygous for axial flowers with a plant that has terminal flowers.
Genotype ratio:
Phenotype ratio:Slide8
Problem #6
Cross a homozygous tall plant with a short plant.
Genotype ratio:
Phenotype ratio:Slide9
Problem #7
Cross a plant that is heterozygous for smooth pods with a plant that had constricted pods.
Genotype ratio:
Phenotype ratio:Slide10
Problem #8
When a tall plant is crossed with a short plant, some of the offspring are short. What are the genotypes of the parents and the offspring? What is the phenotypic ratio in the offspring?
Parent genotypes:
Offspring genotypes:Phenotypic ratio:Slide11
Problem #9
Three-fourths (3/4) of the plants produced by a cross between two unknown pea plants have axial flowers and ¼ have terminal flowers. What are the genotypes of the parent plants?
Parent genotypes:Slide12
Problem #10
What cross would result in ½ of the offspring having green pods and ½ of the offspring having yellow pods?
Cross:Slide13
INTRODUCING….DRUM ROLL!!!
DIHYBRID CROSSES!!!Slide14
Try this one on your own!
In the deep rainforests of Brazil lives the Ocamazi tribe, amongst the members of this tribe exists a dominant trait for webbed feet (A), most have this trait, those that don’t have non-webbed feet (a). Additionally most members of this tribe
webbed hands(B),
a small minority have normal non-webbed fingers (b). Needless to say this tribe is great at swimming. Problem: An Ocamazi princess Heterozygous for both webbed feet and fingers travels to another tribe to meet her soon to be husband, his tribe also has webbed feet which is also heterozygous for but no webbed hands which he is homozygous for. Draw the cross for the mating of these two people. Slide15
Solution
Princess:
FfWw
Husband: FfwwFFWw
FFWw
FfWw
FfWw
FFww
FfWw
FFww
ffww
ffWw
Ffww
ffww
ffWw
Ffww
Ffww
Ffww
FfWw
FW
fw
Fw
Fw
fw
Fw
fW
fw
F-Webbed Feet, f-Non Webbed Feet
W- Webbed hands, w-Non Webbed hands
Interpret this data!Slide16
Challenge Problem
You are a world-famous breeder of Purple-People
Eaters.
Tragically, your entire stock perishes in a fire except for two individuals. They are both heterozygous for all three traits desired. The three traits are as follows: TraitsEE or Ee=Two eyes
ee
= One
eye
H
H
or Hh=
T
wo
horns
hh= One
horn
FF or
Ff
= Non-flying
ff
= Flying