Flashcards in Chapter 1- Traits Deck (21):
Who did an experiment on peas in 1856?
What was Gregor Mendel's contribution to genetics?
He created the basis for the study of modern genetics.
What is genetics?
The study of inherited characteristics, or traits.
What is pure breeding?
When all the individuals have the same genetic information for a characteristic generation after generation. Eg- malfoys hair
What is a dominant characteristic?
A characteristic that can be observed in an individual.
What is a recessive characteristic?
The characteristic not visible, but hidden
How do genes work?
They work In pairs to determine which characteristic is shown
What are variations of genes?
Different forms of the same gene
How is the dominant allele represented?
Capital letter, eg- A
When is an individual said to be homozygous?
When they have two identical alleles for that gene.
When is an individual said to be heterozygous?
When they have 2 different alleles for a particular gene?
Define Punnet Square?
A Punnet square is a way of displaying all the possible types of offspring from a cross
What is a genotype?
The actual genetic information carried by a person. Eg. RR, rr, Rr
A phenotype is the characteristic you can see.
What are sex linked genes?
Genes present on the sex chromosomes.
What is an example of sex linked genes?
Colour blindness or haemophilia.
What is a chromosomal abnormality and how do they form?
When a kid is born with part of or extra chromosomes. Eg- Down syndrome
What can happen in faulty DNA copying or by chance?
Mutations can be formed. Radiation can cause mutations too.
What happens if mutations occur in eggs or sperm?
It may be passed onto the child