Question 1
Flower homoeotic genes encode: ________.
◦ MADS box genes
◦ homeobox genes
◦ pair-rule genes
◦ housekeeping genes
◦ morphogen genes
Question 2
Holoprosencephaly is a highly variable condition in mammals, including humans. Its effects range from an absence of brain areas, mid-face disorders, and cyclopia to slight dental abnormalities. One form, HPE3, is caused by null mutations in
Shh. Familial cases are inherited as a dominant trait. Which of the following do you expect?
◦ HPE3 is actually a multigene complex.
◦ Each type of malformation is due to a different HPE3 allele.
◦ HPE3 expression is modified by genetic background.
◦ HPE3 individuals also share a common environmental exposure.
◦ All mutations in
Shh that result in HPE3 are due to frameshifts.