Biology for IGCSE & O level - Inheritance (Section 3 - No. 6)
In autosomal recessive inheritance, an affected individual must inherit:
One copy of the affected gene from either parent
Two copies of the affected gene, one from each parent
The dominant allele from one parent
The dominant allele from both parents
Explanation
Autosomal recessive disorders require the presence of two recessive alleles.
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