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Page 569
... gametophytes 555 Sperm H2O Antheridia MEIOSIS Spores Sporangium Gametophytes Protonema Developing gametophyte Diploid Haploid Figure 27.6 Life cycle of a moss . Most species of moss have separate male and female gametophytes , which ...
... gametophytes 555 Sperm H2O Antheridia MEIOSIS Spores Sporangium Gametophytes Protonema Developing gametophyte Diploid Haploid Figure 27.6 Life cycle of a moss . Most species of moss have separate male and female gametophytes , which ...
Page 579
... gametophyte . By the time eggs are ready to be fertilized , two sperm nuclei have developed in the male gametophyte and the pollen tube has grown through the nucellus to the female gametophyte . Fertilization occurs when one of the ...
... gametophyte . By the time eggs are ready to be fertilized , two sperm nuclei have developed in the male gametophyte and the pollen tube has grown through the nucellus to the female gametophyte . Fertilization occurs when one of the ...
Page 741
... gametophyte not yet mature . The female gametophyte is a structure called an embryo sac that develops within an ovule . It is these gametophytes that produce sperm nuclei and eggs , the gametes that unite during fertilization to form ...
... gametophyte not yet mature . The female gametophyte is a structure called an embryo sac that develops within an ovule . It is these gametophytes that produce sperm nuclei and eggs , the gametes that unite during fertilization to form ...
Contents
Themes in the Study of Life | 1 |
UNIT ONE The Chemistry of Life | 15 |
Atoms Molecules and Chemical Bonds | 20 |
Copyright | |
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active adaptive algae allele amino acids animals asexual atoms bacteria biology called Calvin cycle carbon cell walls cellular Chapter chemical chlorophyll chloroplasts chromosome complex covalent cycle cytoplasm diploid disease diversity electron transport chain embryo energy environment enzymes eukaryotic eukaryotic cells evolution evolutionary evolved example fertilization Figure flowers fossil function fungi gametes gametophyte gene pool genetic genome genotype glucose glycolysis haploid human hydrogen bonds inherited ions living meiosis metabolic microscope microtubules minerals mitochondria mitosis molecular mRNA multicellular mutations natural selection nitrogen nucleotide nucleus nutrients occurs organelles organic molecules oxidized oxygen pair pathway phage phenotype phosphate photosynthesis phylum plant cells plasma membrane polypeptide population produce prokaryotes protein protists proton reaction recombinant replication reproduction respiration ribosomes root seed sequence sexual soil solution speciation species sperm strand structure sugar synthesis tion tissue traits vascular vertebrates viruses xylem zygote