all of the offspring display only one form of a particular trait

(a)  

first two individuals crossed in a breeding experiment

(a)  

offspring of the P generation

(a)  

offspring of the F 1 generation

(a)  

different versions of a gene

(a)  

factor that masks another form of a trait

(a)  

not expressed when the dominant from of the trait is present

(a)  

physical appearance of an organism

(a)  

when the two alleles in an gene are the same

(a)  

the alleles in a gene are different

(a)  

set of alleles that an indiviual has

(a)  

genetically determined variant of a characteristic

(a)  

a cross that considers two pairs of contrasting traits

(a)