Passing on genetic information from parents to children

Passing on genetic information from parents to children An explanation of autosomal recessive inheritance

Here are some PowerPoint teaching slides which demonstrate the transmission of an autosomal recessive condition from parent to child, please feel free to use these within your teaching Some parts of the animations run automatically; others require a mouse click Most slides have notes with further information

The 46 human chromosomes seen down the microscope Hundreds of genes are located on each chromosome (The dark bands on the chromosomes are due to a special staining technique and are not genes as these are too small to see)

The 46 human chromosomes arranged in their 23 pairs (these are the chromosomes of a normal male)

Chromosome pair Position of particular gene

Has the condition Altered gene Altered gene Unaffected carrier for the condition Usual gene Altered gene

Autosomal recessive inheritance where both parents are carriers Parents Carrier for the condition Carrier for the condition Sperm or eggs

Autosomal recessive inheritance where both parents are carriers Parents Carrier for the condition Carrier for the condition Sperm or eggs At conception

Autosomal recessive inheritance where both parents are carriers Parents Carrier for the condition Carrier for the condition Sperm or eggs At conception Has the condition Does not have the condition, non-carrier Carrier for the condition Carrier for the condition

This animation is part of a series describing modes of inheritance To access these and other resources for teaching and learning genetics, please visit: www.geneticseducation.nhs.uk

Passing on genetic information from parents to children