23 Questions
What is a characteristic feature of spiral and determinate cleavage?
Asymmetrical lines or planes of cleavage
What is the fate of each blastomere in spiral and determinate cleavage?
Predetermined roles in embryo formation
Which groups of organisms exhibit spiral and determinate cleavage?
Mollusks and annelids
Match the following cleavage types with their characteristics:
Spiral and determinate cleavage = Predetermined roles for all blastomeres in embryo formation Radial and indeterminate cleavage = Contrasts with spiral and determinate cleavage
Match the following cleavage types with the groups of organisms they are characteristic of:
Spiral and determinate cleavage = Characteristic feature of certain groups of organisms Radial and indeterminate cleavage = Not a characteristic feature of certain groups of organisms
Match the following statements with the cleavage type they describe:
Asymmetrical lines or planes of cleavage = Spiral and determinate cleavage Contrasts with radial and indeterminate cleavage = Spiral and determinate cleavage Characteristic feature of certain groups of organisms = Spiral and determinate cleavage Not a characteristic feature of certain groups of organisms = Radial and indeterminate cleavage
____ and determinate cleavage is characterized by asymmetrical lines or planes of cleavage. Cleavage lines are diagonal to the polar axis, resulting in unequal cells around the axis of polarity. All blastomeres in spiral and determinate cleavage have predetermined roles in embryo formation. The fate of each blastomere is predetermined in this type of cleavage. This type of cleavage contrasts with radial and indeterminate cleavage. It is a characteristic feature of certain groups of organisms, such as mollusks and annelids.
Spiral
Spiral and determinate cleavage is characterized by asymmetrical lines or planes of cleavage. Cleavage lines are diagonal to the polar axis, resulting in unequal cells around the axis of polarity. All blastomeres in ____ and determinate cleavage have predetermined roles in embryo formation. The fate of each blastomere is predetermined in this type of cleavage. This type of cleavage contrasts with radial and indeterminate cleavage. It is a characteristic feature of certain groups of organisms, such as mollusks and annelids.
spiral
Spiral and determinate cleavage is characterized by asymmetrical lines or planes of cleavage. Cleavage lines are diagonal to the polar axis, resulting in unequal cells around the axis of polarity. All blastomeres in spiral and determinate cleavage have predetermined roles in embryo formation. The fate of each blastomere is predetermined in this type of cleavage. This type of cleavage contrasts with radial and indeterminate cleavage. It is a characteristic feature of certain groups of organisms, such as ____ and annelids.
mollusks
Spiral and determinate cleavage is characterized by symmetrical lines or planes of cleavage
False
All blastomeres in spiral and determinate cleavage have predetermined roles in embryo formation
True
Spiral and determinate cleavage is a characteristic feature of certain groups of organisms, such as mollusks and annelids
True
What is the characteristic feature of spiral and determinate cleavage?
Asymmetrical lines or planes of cleavage
Which type of cleavage contrasts with spiral and determinate cleavage?
Radial and indeterminate cleavage
What is the fate of each blastomere in spiral and determinate cleavage?
Predetermined roles in embryo formation
____ and determinate cleavage is characterized by asymmetrical lines or planes of cleavage
spiral
All blastomeres in spiral and ______ cleavage have predetermined roles in embryo formation
determinate
In spiral and determinate cleavage, the cleavage lines are diagonal to the polar axis, resulting in:
Unequal cells around the axis of polarity
What is the fate of each blastomere in spiral and determinate cleavage?
Predetermined in embryo formation
Which groups of organisms exhibit spiral and determinate cleavage?
Mollusks and annelids
Spiral and determinate cleavage is characterized by symmetrical lines or planes of cleavage.
False
In spiral and determinate cleavage, the fate of each blastomere is predetermined.
True
Spiral and determinate cleavage is a characteristic feature of certain groups of organisms, such as arthropods and echinoderms.
False
Study Notes
Spiral and Determinate Cleavage
- Characterized by asymmetrical lines or planes of cleavage
- Cleavage lines are diagonal to the polar axis, resulting in unequal cells around the axis of polarity
- All blastomeres have predetermined roles in embryo formation
- The fate of each blastomere is predetermined in this type of cleavage
- Contrasts with radial and indeterminate cleavage
- Characteristic feature of certain groups of organisms, such as mollusks and annelids
Test your knowledge of embryology with this quiz on spiral and determinate cleavage. Learn about the asymmetrical lines and predetermined roles of blastomeres in embryo formation. Compare this type of cleavage with other forms to deepen your understanding of early embryonic development.
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