Family trees (AQA GCSE Biology Combined Science): Flashcards
📚Flashcards
Practise the cards
10 cards from this deck
ShowHide
Practise the cards
10 cards from this deck
What do family trees in genetics show?
What do family trees in genetics show?
How traits/alleles pass through generations
What symbol represents males in family trees?
What symbol represents males in family trees?
Squares
What symbol represents females in family trees?
What symbol represents females in family trees?
Circles
What do filled/shaded shapes mean in family trees?
What do filled/shaded shapes mean in family trees?
Person has the condition
How many alleles needed for a recessive condition to show?
How many alleles needed for a recessive condition to show?
Two copies of the recessive allele
What is a carrier (recessive traits)?
What is a carrier (recessive traits)?
Has one copy of allele but shows no symptoms
Pattern of recessive conditions in generations
Pattern of recessive conditions in generations
Can skip generations
How many alleles needed for a dominant condition to show?
How many alleles needed for a dominant condition to show?
Only one copy of the allele
Pattern of dominant conditions in generations
Pattern of dominant conditions in generations
Appears in every generation
What does a Punnett square show?
What does a Punnett square show?
All possible allele combinations from parents