All flashcards
Flashcard 1: Identify the best conclusion: fish and human embryos both have pharyngeal pouches early on.
Answer: Fish and humans share a vertebrate common ancestor. Pharyngeal pouches are a shared vertebrate trait from evolution.
Flashcard 2: Identify the best conclusion: two species have very similar embryos until late development.
Answer: They are more closely related than species whose embryos diverge earlier. Late divergence indicates recent shared ancestry.
Flashcard 3: Identify the best conclusion: species A and B share early embryo traits, but adults look very different.
Answer: Adult differences can result from later developmental changes after shared ancestry. Evolution modifies later development while preserving early patterns.
Flashcard 4: Which statement best summarizes embryological evidence for evolution in one sentence?
Answer: Similar early development in different species supports common ancestry. Shared embryonic features reveal evolutionary relationships.
Flashcard 5: What is embryology in the context of evidence for evolution?
Answer: The study of embryo development used to compare species. Compares developmental stages across species to reveal evolutionary relationships.
Flashcard 6: What is an embryo?
Answer: An early developmental stage of an organism before birth or hatching. Develops after fertilization but before the organism can survive independently.
Flashcard 7: What does it suggest when different species have similar early embryos?
Answer: They likely share a common ancestor. Similar developmental patterns indicate shared evolutionary origins.
Flashcard 8: Which embryological pattern best supports common ancestry: early similarities or late similarities?
Answer: Early similarities. Shared early traits diverge later as species-specific features develop.
Flashcard 9: What is meant by a homologous structure in embryology?
Answer: A shared developmental structure inherited from a common ancestor. Same embryonic origin indicates evolutionary relationship.
Flashcard 10: What is a pharyngeal pouch (pharyngeal arch) in a vertebrate embryo?
Answer: A throat-region structure that can form gills or parts of the ear and jaw. These pouches develop differently in fish (gills) vs mammals (ear/jaw).
Flashcard 11: What embryological feature in vertebrates is often described as a "tail"?
Answer: A post-anal tail present during early development. Present in all vertebrate embryos, even those without adult tails.
Flashcard 12: Which group is best known for showing pharyngeal pouches and post-anal tails as embryos?
Answer: Vertebrates. All vertebrates share these embryonic features from their common ancestor.
Flashcard 13: What is the notochord in an embryo?
Answer: A flexible rod that supports the body and helps form the spine. Precursor to the vertebral column in all vertebrates.
Flashcard 14: What is a shared vertebrate embryonic trait that later becomes the backbone in many species?
Answer: The notochord (and its development into the vertebral column). All vertebrates develop this structure, showing shared ancestry.
Flashcard 15: What is the main evolutionary idea supported by shared embryonic structures?
Answer: Descent with modification from a common ancestor. Species inherit and modify ancestral developmental patterns.
Flashcard 16: Which provides stronger evidence of close relatedness: embryos that stay similar longer or diverge very early?
Answer: Embryos that stay similar longer. Longer similarity indicates more recent common ancestry.
Flashcard 17: Which option best explains why embryological similarities can indicate ancestry rather than coincidence?
Answer: They reflect inherited developmental pathways from an ancestor. Developmental programs are inherited, not randomly similar.
Flashcard 18: What is the key difference between embryological evidence and adult anatomy evidence for ancestry?
Answer: Embryology compares early developmental stages; anatomy compares mature structures. Timing differs: embryology studies early forms, anatomy studies final forms.
Flashcard 19: Which embryological feature is commonly shared among many vertebrate embryos: pharyngeal pouches or flower petals?
Answer: Pharyngeal pouches. All vertebrates develop these structures early in development.
Flashcard 20: What does the presence of a post-anal tail in many vertebrate embryos indicate?
Answer: Shared ancestry among vertebrates. All vertebrates descend from ancestors with tails.
Flashcard 21: Identify the best interpretation: Human and fish embryos both have pharyngeal pouches.
Answer: They inherited similar developmental instructions from a common ancestor. Different species share ancient developmental programs.
Flashcard 22: What is the strongest embryological evidence for close relatedness: very similar early embryos or very different early embryos?
Answer: Very similar early embryos. Greater similarity indicates more recent common ancestor.
Flashcard 23: What is the most accurate statement about embryological evidence and evolution?
Answer: Similar embryos support descent with modification from common ancestors. Species inherit then modify ancestral developmental patterns.
Flashcard 24: What does it suggest if embryonic development differs greatly from the earliest stages in two species?
Answer: They are likely more distantly related. Different development suggests longer evolutionary separation.
Flashcard 25: What is meant by embryological similarity between two species?
Answer: Similar early developmental structures and patterns in their embryos. Shared features during development indicate common ancestry.
Flashcard 26: Which option best supports common ancestry: shared embryonic structures or shared habitat only?
Answer: Shared embryonic structures. Developmental patterns are inherited, not environmental.
Flashcard 27: What is the relationship between embryological similarities and DNA similarities?
Answer: Both can indicate shared genetic instructions from common ancestry. Similar genes produce similar developmental patterns.
Flashcard 28: What is the key reason embryos can reveal ancestry better than adult appearance alone?
Answer: Early development is more conserved than many adult traits. Ancient genes controlling development change slowly.
Flashcard 29: Identify the correct claim: Embryological similarity is evidence for common ancestry or for identical lifestyles?
Answer: Evidence for common ancestry. Development reflects ancestry, not current environment.
Flashcard 30: Which comparison best indicates closer common ancestry: similar embryo stages or similar adult behaviors?
Answer: Similar embryo stages. Development is inherited; behavior can be learned.