Chapter 17 - Inherited change Flashcards
What is the genotype of an organism?
All the alleles possessed by an organism
What is the phenotype of an organism?
Observable characteristics
What two factors contribute to the phenotype?
Genetics and environment
What is a gene?
Length of DNA, codes for polypeptide
What is the locus?
Position of gene on DNA strand
What is an allele?
Different forms of genes
What are codominant alleles?
Both contribute to phenotype
What are multiple alleles?
More than two alleles
What is pure breeding?
Organisms have two of the same alleles for a gene
What is a ratio?
A proportion
Why are the predicted results rarely the same as the observed results?
Only a prediction
Chance
Small sample
What is dihybrid inheritance?
Looking at how two genes on different chromosomes are inherited
How do you work out a dihybrid cross?
Do the same as a normal cross but include both genes
Which genotypes result in blood group A?
IA, IA or IA, IO
Which genotypes result in blood group B?
IB, IB or IB, IO