inheritance - monohybrid croses

what is the basic structure of DNA ?

a double helix and it is contained in chromosomes

what is the genome ?

the entire DNA of an organism

what is a gene ?

a section of a molecule of DNA that codes for a specific protein

what are the 2 types of inheritance ?

monohybrid and polygenic inheritance

what is monohybrid inheritance ?

the inheritance of characteristics controlled by a single gene

what is polygenic inheritance ?

when more than one gene will code for a characteristic

define genotype

the alleles that an organism has

define homozygous

both alleles for one gene are the same

define heterozygous

the alleles for one gene are different

define recessive

both alleles are needed to be expressed in the phenotype

define phenotype

what the organism looks like

define dominant

if the allele is present, it will always be expressed in the phenotype

define allele

alternative forms of the gene

define chromosome

structure in the nucleus in the DNA

define DNA

the chemical molecule

how do genes exist in alternative forms ?

they are called alleles which give rise to differences in inherited characteristics

what is polydactyl caused by ?

dominant allele

what is cystic fibrosis caused by ?

recessive allele