Bio 102 Lab Report 1
Dayanna Chiriboga
02/03/2015
Lab Report #1
Genetics 1
χ² Results
:
Phenotype
Expected Expected Observed
Ratio
Counts
Counts
(Eͥ
i)
ͥ
(Oi)
Deviation
(di)
=(EiOi)
di² =
(EiOi)²
di²/Ei
Purple
75%
657
642
15
225
.34
Yellow
25%
219
234
15
225
1.03
Χ² = ∑ (di / Ei) = 1.37
According to the chi square chart values we are 80% confident that our hypothesis is correct.
Exercise 34.
Trait
Phenotype
Your Phenotype
Number in Class with Phenotype
Handedness
Right Handed*
✔
17
Left Handed
2
Ear Lobes
Free*
✔
15
Attached
4
Freckles
Freckled*
2
Non Freckled
✔
17
Hairline
Widows Peak*
5
Straight
✔
14
Little Finger
Bent*
4
Straight
✔
15
Tongue Roll
Yes*
14
No
✔
5
Rh Factor
Rh+*
✔
Rh
l. For each trait is the dominant phenotype always more abundant among class members? No, the dominant is not always the most abundant.
m. Assuming your class to be representative of the general population, what can you conclude about the relationship between dominant and recessive phenotypes and their frequencies in the population?
The dominant phenotypes are not always the most frequent, and some of the times the recessive phenotypes are the ones that show the most in a population. Dominant phenotypes are not the most abundant in the population.
n. Newlyweds Bill and Sue are non freckled. Since each had one parent that had freckles, they wonder what the possibility is of their children having freckles. What would you tell them.
I would tell them that there is no possibility of them having children with freckles, since they both have a homozygous recessive genotype. Therefore
02/03/2015
Lab Report #1
Genetics 1
χ² Results
:
Phenotype
Expected Expected Observed
Ratio
Counts
Counts
(Eͥ
i)
ͥ
(Oi)
Deviation
(di)
=(EiOi)
di² =
(EiOi)²
di²/Ei
Purple
75%
657
642
15
225
.34
Yellow
25%
219
234
15
225
1.03
Χ² = ∑ (di / Ei) = 1.37
According to the chi square chart values we are 80% confident that our hypothesis is correct.
Exercise 34.
Trait
Phenotype
Your Phenotype
Number in Class with Phenotype
Handedness
Right Handed*
✔
17
Left Handed
2
Ear Lobes
Free*
✔
15
Attached
4
Freckles
Freckled*
2
Non Freckled
✔
17
Hairline
Widows Peak*
5
Straight
✔
14
Little Finger
Bent*
4
Straight
✔
15
Tongue Roll
Yes*
14
No
✔
5
Rh Factor
Rh+*
✔
Rh
l. For each trait is the dominant phenotype always more abundant among class members? No, the dominant is not always the most abundant.
m. Assuming your class to be representative of the general population, what can you conclude about the relationship between dominant and recessive phenotypes and their frequencies in the population?
The dominant phenotypes are not always the most frequent, and some of the times the recessive phenotypes are the ones that show the most in a population. Dominant phenotypes are not the most abundant in the population.
n. Newlyweds Bill and Sue are non freckled. Since each had one parent that had freckles, they wonder what the possibility is of their children having freckles. What would you tell them.
I would tell them that there is no possibility of them having children with freckles, since they both have a homozygous recessive genotype. Therefore