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3.03 - Mendel

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by

Kelsey Mullis

on 6 August 2014

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Transcript of 3.03 - Mendel

3.03 - Mendel
Families
Analysis & Conclusion
1. Identify the trait that you believe to be dominant for each of the features surveyed. Explain your reasoning.
- Dominant traits: Free earlobes, no hair on knuckles, no widow's peak, curly/wavy hair, & no cleft chin. I believe this because most of the people had these genes. Also, for instance, even if the parents have different type earlobes, most of the time the offspring's outcome was free.

2. What recessive features do you exhibit? Do you have any relatives who exhibit those same features?
- I don't exhibit any recessive features.

3. In the family you surveyed, what features did the offspring share with one or both parents? Were there any features that the offspring exhibited that were not exhibited by either parent?
- There were no features where the child did not take from their parent. The offspring shared free earlobes, no hair on knuckles, no widow's peak, curly hair, and a cleft chin. Either one of both shared all of these traits.

4. How is it possible for an offspring to exhibit a recessive trait if neither parent exhibited that recessive trait? What must be true about the parents’ genes for this to occur?
- One or both of the parents had both alleles from their parents, but one was dominant in them. When the had their child, that other gene then showed in them.

5. Are there any results in your data that surprised you?
- None of the data surprised me.

6. It is possible that a recessive trait in a survey such as this one may have a greater total number than its dominant counterpart. Explain how that might happen in an investigation like this.
- It is possible because the offspring's grandparent(s) may have had a trait that the offspring carries.

7. How might surveying a different number of people or different population of people possibly change the percentages that you calculated?
- If I surveyed more people, there would be a change in the percentage. Because everyone is different, you never know what to expect.

Feature
Trait
Total
Trait
Total
Earlobes
Hair on knuckles
Hair Line
Hair Texture
Chin Shape
Hair present between second and third knuckle of fingers
No hair present between second and third knuckle of fingers
Free Earlobes
Attached Earlobes
Widow's
Peak
Straight Hair
Line
Curly Hair
Straight Hair
Cleft Chin
No cleft chin
14
6
4
16
6
14
15
5
6
14
Father
Mother
Offspring
#1
Offspring
#2
Family
Member
Earlobes
Hair on
Knuckles
Hair
Line
Hair
Texture
Chin
Shape
Free
Free
Free
Free
Hair
No Hair
Hair
No Hair
Widow's
Peak
No
Widow's
Peak
No
Widow's
Peak
No
Widow's
Peak
Straight
Curly
Curly
Curly
No
Cleft
Cleft
Cleft
No
Cleft
Family
Member
Earlobes
Hair on
Knuckles
Hair
Line
Hair
Texture
Chin
Shape
Father
Mother
Offspring
#1
Offspring
#2
Offspring
#3
Offspring
#4
Free
Attached
Free
Attached
Free
Free
Yes
No
No
No
No
No
No Widow's
Peak
No
No
No
No
No
Curly
Straight
Curly
Curly
Straight
Straight
No Cleft
Cleft
No Cleft
No Cleft
Cleft
No Cleft
Family
Member
Earlobes
Hair on
Knuckles
Hair
Line
Hair
Texture
Chin
Shape
Father
Mother
Offspring
#1
Free
Free
Free
No
No
No
No
Widow's
Peak
Widow's
Peak
No
Widow's
Peak
Curly
Curly
Curly
Cleft
No Cleft
Cleft
Father
Mother
Offspring
#1
Family
Member
Earlobes
Hair on
Knuckles
Hair
Line
Hair
Texture
Chin
Shape
Attached
Free
Attached
Yes
No
No
No Widow's
Peak
No Widow's
Peak
No Widow's
Peak
Curly
Straight
Curly
No Cleft
No Cleft
No Cleft
Family
Member
Earlobes
Hair on
Knuckles
Hair Line
Hair
Texture
Chin
Shape
Father
Mother
Offspring
#1
Offspring
#2
Offspring
#3
Offspring
#4
Free
Attached
Free
Attached
Free
Free
Yes
No
No
No
No
No
No Widow's
Peak
No Widow's
Peak
No Widow's
Peak
No Widow's
Peak
No Widow's
Peak
No Widow's
Peak
Curly
Straight
Curly
Curly
Straight
Straight
No Cleft
Cleft
No Cleft
No Cleft
Cleft
No Cleft
Calculated
Percentage
Calculated
Percentage
70%
30%
80%
20%
30%
70%
75%
25%
30%
70%
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