types of eggs eggs classified according to the amount or distribution of yolk. according to the...

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Types of eggs Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk , the egg arranged into the following: 1. Alecithal : Without yolk. eg. mammal 2. Oligolecithal : Small amount. eg. amphioxus 3. Mesolecithal: Moderate amount. eg. toad 4. Polylecithal : Large amount . eg. Bird According to distribution of yolk : 1. Homolecithal: The yolk equally distributed throughout the cytoplasm. Eg. Amphioxus. 2. Centrolecithal: The yolk concentrated in a net like structure arround the nucleus. Eg. Insects. 3. Telolecithal: The yolk deposited in vegetal pole. Light telolecithal type with moderate amount of yolk (eg. Toad). Heavy lellecithal type with large amount of yolk (eg. Bird).

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Page 1: Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk, the egg arranged into the following: 1.Alecithal

Types of eggsTypes of eggsEggs classified according to the amount or distribution of yolk.According to the amount of yolk , the egg arranged into the following:1. Alecithal : Without yolk. eg. mammal2. Oligolecithal : Small amount. eg. amphioxus3. Mesolecithal: Moderate amount. eg. toad4. Polylecithal : Large amount . eg. Bird

According to distribution of yolk :1. Homolecithal: The yolk equally distributed throughout the

cytoplasm. Eg. Amphioxus.2. Centrolecithal: The yolk concentrated in a net like structure arround

the nucleus. Eg. Insects.3. Telolecithal: The yolk deposited in vegetal pole. Light telolecithal

type with moderate amount of yolk (eg. Toad). Heavy lellecithal type with large amount of yolk (eg. Bird).

Page 2: Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk, the egg arranged into the following: 1.Alecithal

1. Holoblastic cleavage: a. Equal holoblastic: The zygote gives two

equal blastomeres. Eg. Amphioxus. b. Unequal holoblastic: The zygote give two

unequal blastomeres. Eg. Toad.2. Superficial cleavage: The nucleus divides into

several ones which migrate toward the surface which surround by cytoplam .eg. Insects.

3. Discoidal cleavage : Localized in germinal disc. Eg. Birds.

Pattern of cleavagePattern of cleavage

Page 3: Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk, the egg arranged into the following: 1.Alecithal

Page 4: Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk, the egg arranged into the following: 1.Alecithal

Page 5: Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk, the egg arranged into the following: 1.Alecithal

Page 6: Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk, the egg arranged into the following: 1.Alecithal

Page 7: Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk, the egg arranged into the following: 1.Alecithal

Page 8: Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk, the egg arranged into the following: 1.Alecithal

Superficial CleavageBirds

Page 9: Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk, the egg arranged into the following: 1.Alecithal

Page 10: Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk, the egg arranged into the following: 1.Alecithal

Page 11: Types of eggs Eggs classified according to the amount or distribution of yolk. According to the amount of yolk, the egg arranged into the following: 1.Alecithal

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