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1. The earlobes of an individual are detached or attached - Edexcel - GCSE Biology - Question 1 - 2012 - Paper 1
Question 1
1. The earlobes of an individual are detached or attached. This is determined by the alleles inherited from their parents. An individual with attached earlobes must... show full transcript
Worked Solution & Example Answer:1. The earlobes of an individual are detached or attached - Edexcel - GCSE Biology - Question 1 - 2012 - Paper 1
Step 1
State the genetic term used to describe an individual with the genotype ee for attached earlobes.
Answer
The genetic term used to describe an individual with the genotype ee for attached earlobes is 'homozygous recessive'. This means the individual has two identical recessive alleles for that trait.
Step 2
Determine the possible offspring genotypes from the given parental genotypes.
Answer
To find the possible offspring genotypes, we can set up a Punnett square.
Punnett Square:
| E | e | |
|---|---|---|
| e | Ee | ee |
| e | Ee | ee |
From this square, the possible offspring genotypes are:
- 50% Ee (heterozygous)
- 50% ee (homozygous recessive)
Step 3