Plant and animal breeding Flashcards
Selection of treatments
To ensure fair comparisons
Number of replicates
To take account of the variability within the sample.
Randomisation of treatments
To eliminate bias when measuring treatment effects.
What is inbreeding
Related planes bred for several generations until bred true due to ELIMINATION OF HETEROZYGOTES
What is the negative result of inbreeding
Inbreeding depression which is an increase in the frequency of individuals who are homozygous for deleterious alleles.
How can inbreeding depression be avoided
By outbreeding
What are self pollinating plants less susceptible to inbreeding depression
Deleterious alleles are eliminated in natural selection.
Example of an improved characteristic as a result of cross breeding
Increased vigour
Increase disease resistance
Increased growth rate
What can the two parent breeds in cross breeding do
Maintained to produce more crossbred animals showing improved characteristic
What do F1 hybrids produce
A relatively uniform heterozygous group.
Problem with F2 generation
Show too much variation.
What is recombinant DNA technology used for
Produce crops that contains genes that make them resistant to herbicides.
