A green budgie is crossed with a blue budgie. E. All of these are possible, but with different probabilities. Two blue budgies were crossed. There is much genetic variation in garden peas. B. Traits are inherited in discrete units, one from each parent.
Dominant genes occur more frequently than recessive ones.
An organism that is homozygous for many recessive traits is at a disadvantage. The advantage of chorionic villi sampling over amniocentesis is that CVS a. detects chromosomal abnormalities not detected by amniocentesis. B. can give results earlier in the pregnancy than amniocentesis. The fact that all seven of the garden pea traits studied by Mendel obeyed the principle of independent assortment means that the a. haploid number of garden peas is 7. D. seven pairs of alleles determining these traits behave as if they are on different chromosomes.