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Chapter 22: Development and Aging

Chapter 22: Development and Aging. Early Developmental Stages. Fertilization occurs when the sperm and egg interact to produce a zygote . During fertilization, the acrosome of a sperm releases enzymes that digest a hole in the corona radiata , then in the zona pellucida around the egg.

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Chapter 22: Development and Aging

Chapter 22: Development and Aging. Early Developmental Stages. Fertilization occurs when the sperm and egg interact to produce a zygote . Several sperm may penetrate the corona radiata , several may attempt to penetrate the zona pellucida , but only one sperm enters the egg.

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26.2 Chordate Evolution

26.2 Chordate Evolution. Embryo evidence suggests earliest chordates were related to echinoderms!. Pikaia - early chordate - has notochord, no bones (also called M ylokunmingia ). Cartilage - strong connective tissue more flexible than bone (came before bone)

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Nonvertebrate Chordates, Fishes, and Amphibians

Nonvertebrate Chordates, Fishes, and Amphibians. Ms. Moore 3-1-13. What is a Chordate?. Phylum: Chordata A chordate is an animals that has, for at least some stage of life, a dorsal, hollow nerve cord; a notochord ; pharyngeal pouches ; and a tail that extends beyond the anus.

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ANCESTRAL LIZARD (with limbs)

No limbs. Eastern glass lizard. Monitor lizard. Iguanas. ANCESTRAL LIZARD (with limbs). Snakes. No limbs. Geckos. Species: Panthera pardus. Genus: Panthera. Family: Felidae. Order: Carnivora. Class: Mammalia. Phylum: Chordata. Kingdom: Animalia. Domain: Bacteria. Domain:

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