Module 3

Question 1

Mendel’s conclusions were not incorrect, but they have had
to be modified

Answer 1

Mendel was studying simple dominance
* The idea of just two alleles per trait is too restrictive
* Various genes work together
* Environmental influence

Question 2

Variations on Mendel-Considerations

Answer 2

Dominance relations affect phenotype and have no bearing on the
segregation of alleles
* Alleles still segregate randomly
* Therefore, Mendel’s law of segregation still applies
* But–interpretation of phenotype/genotype relation is often more
complex than Mendel reported
* Gene products control expression of phenotypes differently

Question 3

mendel was looking at

Answer 3

complete dominance

Question 4

single gene inheritence

Answer 4

incomplete dominance. , recessive lethal allels

Question 5

pleiitropy

Answer 5

he production by a single gene of two or more apparently unrelated effects.