- What are the
phenotypes ? What is the ratio of those phenotypes?
The phenotypes would be:
(a) Yellow with smooth
(b) Yellow with wrinkled
3:1
Part 2: Data Tables
Table 1: Parent Genotypes: Monohybrid Crosses
Generation |
Genotype of Individual #1 |
Genotype of Individual #2 |
P |
Yy |
Ss |
P1 |
Yy |
Ss |
P2 |
Yy |
ss |
P3 |
Yy |
SS |
P4 |
YY |
SS |
Table 2: Generation Data Produced by Monohybrid Crosses
Generation |
Possible Offspring Genotypes |
Possible Offspring Phenotypes |
Genotype Ratio |
Phenotype Ratio |
P |
yySs |
|
|
|
P1 |
yySs |
|
|
|
P2 |
Yyss |
|
|
|
P3 |
YySS |
|
|
|
P4 |
YYSS |
|
|
|
Part 2: Post-Lab Questions
- How much genotypic variation do you find in the randomly picked parents of your crosses?
- How much in the offspring?
- Pool all of the offspring from your five replicates. How much phenotypic variation do you find?
- Is the ratio of observed phenotypes the same as the ratio of predicted phenotypes? Why or why not?
- What is the difference between genes and alleles?
- How might protein synthesis execute differently if a mutation occurs?
- Organisms heterozygous for a recessive trait are often called carriers of that trait. What does that mean?
- In peas, green pods (G) are dominant over yellow pods. If a homozygous dominant plant is crossed with a homozygous recessive plant, what will be the phenotype of the F1 generation? If two plants from the F1 generation are crossed, what will the phenotype of their offspring be?
Part 3: Data Tables
Table 3: Parent Genotypes: Dihybrid Crosses
Generation |
Genotype of Individual #1 |
Genotype of Individual #2 |
P |
|
|
P1 |
|
|
P2 |
|
|
P3 |
|
|
P4 |
|
|
Table 4: Generation Data Produced by Dihybrid Crosses
Generation |
Possible Offspring Genotypes |
Possible Offspring Phenotypes |
Genotype Ratio |
Phenotype Ratio |
P |
|
|
|
|
P1 |
|
|
|
|
P2 |
|
|
|
|
P3 |
|
|
|
|
P4 |
|
|
|
|
Part 3: Post-Lab Questions
- How similar are the observed phenotypes in each replicate?
- How similar are they if you pool your data from each of the five replicates?
- Is it closer or further from your prediction?
- Did the results from the monohybrid or dihybrid cross most closely match your predicted ratio of phenotypes?
- Based on these results, what would you expect if you were looking at a cross of 5, 10, or 20 independently sorted genes?
- Why is it so expensive to produce a hybrid plant seed?
- In certain bacteria, an oval shape (O) is dominant over round (o) and thick cell walls (T) are dominant over thin (t). Show a cross between a heterozygous oval, thick cell walled bacteria with a round, thin cell walled bacteria. What are the phenotypes of the F1 and F2 offspring?
Help Please!
Images are for reference only, I need help with the questions above. Thank you.
Phenotypes : A phenotype is an individual observable traits , such as height , eye color , blood type etc. The genetic contribution to the phenotype is called genotype.
Yellow and smooth seeds in which yellow is dominant and smooth is dominant while
Yellow and wrinkled seeds in which yellow is dominant and wrinkled is recessive.
So genotypes can be :
Yellow and smooth Yellow and wrinkled
YYSS , YySs , YYSs, YySS YYss , Yyss
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