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Transcript of Lesson 03.03
2. What recessive features do you exhibit? Do you have any relatives who exhibit those same 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? 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?
5. Are there any results in your data that surprised you?
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.
7. How might surveying a different number of people or different population of people possibly change the percentages that you calculated? Earlobes
Hair on knuckles
Hair Line (widow’s peak vs. straight hair line)
Chin shape (no cleft chin vs. cleft chin) Free Earlobes
Hair present between second and third knuckle of fingers
Curly hair (count wavy hair as curly)
Cleft chin Feature Trait Total Trait Total Attached Earlobes
No hair present between second and third knuckle of fingers
Straight hair line
No cleft chin Survey at least 20 people to find out what traits they have for each of the features below. Tally the numbers for each trait and record those totals in each column.
When completing the survey, be sure to include yourself as one of the individuals surveyed. Also include at least one set of parents and offspring in the individuals you survey. Document the features of each member of the family you surveyed within the data table, but also make a special note of these features in the observation section of your report. This information will be important when writing your conclusion. Data Family members Earlobes Hair on knuckles Hair line Hair texture Chin shape Father Mother Offspring Free Free Free Yes Yes Yes Straight Widows peak Straight Straight Straight Straight Yes No No 20 5 16 5 None 5 16 19 1 Calculated Percentage Calculated Percentage 100% 80% 25% 25% 5% 0% 25% 80% 80% 95% Well I have the same color eye's as every blood relative I have. However we all don't have the same color hair or texture some of my blood relatives have from dark brown too blond, and curly too straight. But none of us have a different color eyes. The offspring shared in both parents features, but there wasn't any features that the offspring showed that was different or unexplainable with only this little of data. For an offspring to show a different trait than both parents it would either have to be a gene from one or both of the parents family or their parent to have had that trait as well earlier in their families history. The other way for it to be possible is if the offspring developed a pigmentation in their genes. I was surprised that there wasn't any pigmentation in the offspring. The two parents must of had strong genes. I was only surprised because I thought that would be cool to talk about. pigmentation isn't common It all depends on the strength of their genes. Like their families history. Data for 3-20 Father Mother Offspring Offspring2 Father Mother Offspring Offspring2 Offspring3 Data 7-20 Data 12-20 Father Mother Offspring Offspring2 Offspring3 Offspring4 Data 17-20 Father Mother Offspring Data 20-20 Family 1 Family2 Family 3 Family 4 Family 5 Free Free Free Free Free Free Free Free Free Free Free Free Free Free Free Free Free Free Yes No Yes No Yes Yes Yes No Yes Yes Yes Yes Yes Yes Yes Yes No No Straight Widows peak Widows peak Straight Curly Curly Curly Curly No No No No Widows peak Straight Straight Straight Straight Straight Straight Straight Straight Curly No No No No No Straight Straight Widows peak Straight straight Straight Straight Straight Straight Straight Straight Straight No No No No No No Straight Straight Straight Straight Curly Straight No No No 16 Well the "no cleft chin" was at a 95% out of all of the families, I think the most reason for this it that each family parent is a cousin in my family and we don't really have a long line of cleft chins. Anywhere, where something is about the same is too their genes and where it originated from. in family three offspring 3 the little girl has curly hair, for right now she's just a baby, but all the other offspring's had the same type of scenario where they had curly hair for awhile then it got straight