Biology

03.03 Activity Sheet

Directions: Survey 20 people to find out what traits they have for each of the features below. Include yourself in the survey. Include at least one set of parents and offspring in the survey. Fill out the RED sections of this activity sheet.

Data Chart:

Feature|Trait|Total|Trait|Total|

Earlobes|Free earlobes|19|Attached earlobes|1|

Knuckle hair|Hair between second & third knuckle of fingers|11|No hair between second & third knuckle of fingers|9|

Hair line |Widow’s peak|15|Straight hair line|5|

Hair texture|Curly hair(wavy hair is curly)|16|Straight hair|4|

Chin shape |Cleft chin|2|No cleft chin|18|

Chart Detailing the Family in Your Survey:

Family Member|Earlobes|Knuckle hair|Hair line|Hair texture|Chin shape|

Father|Free|Yes|widows peak|curly|cleft|

Mother|Free|Yes|widow's peak|curly (wavy)|no cleft|

Offspring |Free|Yes|widows peak|straight|cleft|

Percentage Calculations:

Formula: __ people with free earlobes ÷ 20 people total × 100 = __ % free earlobes

Feature|Trait|Calculated Percentage|Trait|Calculated Percentage|

Earlobes|Free earlobes|95%|Attached earlobes|5%|

Knuckle hair|Hair between second & third knuckle of fingers|55%|No hair between second & third knuckle of fingers|45%|

Hair line |Widow's peak|75%|Straight hair line|25%|

Hair texture|Curly hair(wavy hair is curly)|80%|Straight hair|20%|

Chin shape |Cleft chin|10%|No cleft chin|90%|

Conclusion and Analysis:

1. Identify the trait you believe to be dominant for each of the features surveyed.

· Free earlobes

· Hair between second & third knuckle of fingers

· Widow's peak

· Curly hair

· No cleft chin

2. What recessive features do you exhibit?

· Free earlobes

· Hair between second & third knuckle of fingers

· Curly hair

· No cleft chin

· Straight hair line

3. Do you have any relatives who exhibit those same recessive features? Yes, most of them.

4. In the family you surveyed, what features did the offspring share...