In a species showing sporophytic incompatibility, which type(s) of pollen could successfully fertilize an S2S3 flower? (A) S1 pollen from an S1S3 flower (B) S2 or S3 pollen from an S2S3 flower (C) S3 pollen from an S1S1 flower (D) S1 pollen from an S1S1 flower

In angiosperms, are sperm and eggs produced by mitosis or meiosis? Which cells are spores? Which structures are gametophytes?

Match questions 3–8 with options a–f. 3. Attracts pollinator 4. Develops into seed 5. Protects flower before it opens 6. Produces sperm 7. Produces pollen 8. Houses ovules a. pollen grain b. ovule c. anther d. ovary e. sepal f. petal

Some plant species produce male and female individuals in which the males have an XY genotype and the females have an XX genotype. After double fertilization, what would be the genotypes of the embryos and endosperm nuclei? (A) embryo XY/endosperm XXX or embryo XX/endosperm XXY (B) embryo XX/endosperm XX or embryo XY/endosperm XY (C) embryo XX/endosperm XXX or embryo XY/endosperm XYY (D) embryo XX/endosperm XXX or embryo XY/endosperm XXY

Some dioecious species have the XY genotype for male and XX for female. After double fertilization, what would be the genotypes of the embryos and endosperm nuclei?a. embryo XY/endosperm XXX or embryo XX/endosperm XXYb. embryo XX/endosperm XX or embryo XY/endosperm XYc. embryo XX/endosperm XXX or embryo XY/endosperm XYYd. embryo XX/endosperm XXX or embryo XY/endosperm XXY

A small flower with green petals is most likelya. bee-pollinated.b. bird-pollinated.c. bat-pollinated.d. wind-pollinated.

What are the advantages and disadvantages of self-fertilization versus those of outcrossing?

DRAW IT Draw and label the parts of a flower.

Make a sketch of a simplified flower with all four organs, and indicate how the pattern of expression for just two genes (e.g., 'D' and 'E') could, hypothetically, regulate the development of each organ. Consider that what's important is whether a gene is on or off and that a structure can be specified when neither gene is expressed.