Lecture 2

Question 1

what is self incompatibility

Answer 1

pollen produced by a plant is not capable of fertilizing the ovules of the same plant

Question 2

how does self incompatibility work

Answer 2

matching alleles (pollen = pistil) result in incompatibility, but different alleles can overcome the incompatibility

Question 3

2 types of self incompatibility

Answer 3

Gametophytic and sporophytic

Question 4

what is gametophytic incompatibility

Answer 4

male gametes can fertilize the ovule IF it has a S allele that differs from both alleles in the pistil (occurs after meiosis)

Question 5

what is a mechanism of gametophytic incompatibility and how does it work

Answer 5

Immunological reaction between pollen and pistil
Style produces RNase with hypervariable region and pollen tube produces a targeting molecule (SLF) that can bind to the HV region. if SLf has different alleles it can bind to RNase and if it has same allele, it cannot and gets degraded

Question 6

how does sporophytic incompatibility work

Answer 6

all gametes from a single male have the same ability to fertilize regardless of the genotype of the individual pollen grain (based on parental genotype and dominance) (occurs before meiosis)

Question 7

what is male sterility

Answer 7

plant is incapable of producing pollen

Question 8

what type of genes can control if a plant is male sterile

Answer 8

nuclear or cytoplasmic

Question 9

is male sterility via nuclear control typically dominant or recessive

Answer 9

recessive

Question 10

where does cytoplasmic male sterility inherit genes

Answer 10

it is a maternal inherited trait

Question 11

what influences the structure of populations

Answer 11

mode of reproduction
founding individuals
immigration and emigration
mutation
viability of genotypes
human selection