Inheritance (AQA GCSE Biology): Flashcards
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Inheritance
Inheritance
Characteristics pass from parents to children through genes
Polydactyly
Polydactyly
Genetic condition with extra fingers or toes
Type of allele causing polydactyly
Type of allele causing polydactyly
Dominant allele
Copies of dominant allele needed to show trait
Copies of dominant allele needed to show trait
One copy
Chance of polydactyly if one parent has it
Chance of polydactyly if one parent has it
50% (1 in 2)
Polydactyly outcome if both parents have it
Polydactyly outcome if both parents have it
All children will have the condition
What cystic fibrosis affects
What cystic fibrosis affects
Cell membranes, breathing, and digestion
Type of allele causing cystic fibrosis
Type of allele causing cystic fibrosis
Recessive allele
Copies of recessive allele needed to show trait
Copies of recessive allele needed to show trait
Two copies
Chance of CF if both parents are carriers
Chance of CF if both parents are carriers
25% (1 in 4)
Chance of being CF carrier (both parents carriers)
Chance of being CF carrier (both parents carriers)
50% (1 in 2)
Carrier (genetics)
Carrier (genetics)
Has one copy of faulty allele but not the condition
Female sex chromosomes
Female sex chromosomes
XX
Male sex chromosomes
Male sex chromosomes
XY
Which parent determines child's biological sex
Which parent determines child's biological sex
Father