Page 1 - 3-Home Assignment-II (Activity-9- Free & attached Earlobes- Accumulation of Variation
P. 1
SAI International School
Subject- Biology
Chapter- Heredity And Evolution
Subtopic- Accumulation of variation during Reproduction,
Heredity- Inherited traits, Mendel’s work, Monohybrid cross
Module-23
Home Assignment- II (Activity)
CHAPTER: Heredity and Evolution
Activity---9
EXPERIMENT: - To observe (a) free and attached earlobes, (b) Widow’s Peak
Materials Required:
Pictures on Free and Attached ear lobes and widow’s peak.
How to proceed: (a) Free and attached earlobes
1. Study the number of students in the class having free earlobes or attached earlobes.
2. Ask the students to give details about the earlobes of their parents, brothers and
sisters.
3. Calculate the percentage of both types of earlobes.
Observation Table:
Sl Name of student Free/ Earlobe of Earlobe of Earlobe of
No Attached father mother brother/ sister
Earlobe
1.
2.
3.
4.
5.
Calculation of % = No. of students with free earlobes x100
Total Students
Inference:
Free Earlobes is a dominant trait seen in human beings.
How to proceed: (b) Widow’s Peak
1. Study the number of students in the class having widow’s and having straight hairline .
