Evolutionary Theories Since Darwin

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What did Jan Swammerdam's Preformation Theory propose?

Ova contain adult organisms in miniature form (correct)

Eggs provide nourishment for the developing embryo

The act of fertilization causes genetic mutations

Sperm cells contain adult organisms in miniature form

According to Caspar Friedrich Wolff, where did he conclude the preformed embryo is not found?

In the developing embryo

In the egg or sperm (correct)

In the adult organism

In the external environment

How did Caspar Friedrich Wolff's observations impact the preformation theory?

He disproved the existence of preformed embryos in eggs and sperm (correct)

He confirmed that the miniature embryo exists in the egg and sperm

He discovered the process of fertilization

He proposed the Preformation Theory

What did Jean-Baptiste Lamarck propose as a mechanism for evolution?

Inheritance of acquired characteristics Signup and view all the answers

How did Charles Darwin explain the origin of new species?

Through natural selection Signup and view all the answers

Which scientist proposed the theory of Epigenesis to replace the Preformation Theory?

Caspar Friedrich Wolff Signup and view all the answers

What remains unanswered despite the well-documented theory of the Biochemical Origin of Life by Oparin and Haldane?

The origin of sex Signup and view all the answers

Why is sexuality so widespread in nature based on the text?

To ensure survival through genetic variability Signup and view all the answers

What is one of the major unsolved problems of evolution related to sexuality according to the text?

How did maleness and femaleness arise? Signup and view all the answers

What is a major challenge in tracing the relationships between existing phyla and past phyla?

Lack of transitional forms between phyla Signup and view all the answers

Why does disagreement exist about present-day phyla?

Incomplete fossil records and unknown transitional forms Signup and view all the answers

What is one of the reasons cited for mass extinction events according to the text?

Asteroids Signup and view all the answers

What theory did Darwin propose to explain how characteristics are transmitted from parents to offspring?

Theory of Pangenesis Signup and view all the answers

In Darwin's Theory of Natural Selection, what is the main driving force behind evolution?

Natural Selection Signup and view all the answers

Which theory did Darwin propose to explain the variations in species that were not adequately explained by natural selection?

Theory of Sexual Selection Signup and view all the answers

What did Darwin believe was a common feature in mating competitions among males?

Attractiveness to females Signup and view all the answers

According to the Pangenesis theory, where do the gemmules or pangene accumulate in the body?

Blood Signup and view all the answers

What did Darwin propose as the mechanism through which characteristics from all parts of the body are transmitted to offspring?

Pangenesis Signup and view all the answers