Biology Topic Practice

Mendel's Genetics Experiments

Gregor Mendel carried out breeding experiments on pea plants, laying the foundations of modern genetics.

What did Mendel refer to as "units" of inheritance?

What is Mendel's Genetics Experiments?

"Mendelian genetics is a set of primary tenets relating to the transmission of hereditary characteristics from parent organisms to their children."

Question 1

How many times does the cell divide during meiosis?

Question 2

Why is understanding the human genome important for modern medicine?

Question 3

Which group belongs to the domain Archaea rather than true bacteria?

Question 4

If both parents are heterozygous (Bb) for a recessive trait (b), what is the probability their child will express the trait?

Early Genetics

In the mid-19th century, Mendel observed that characteristics are determined by "units" that are passed on unchanged.

Mendel's work was not recognised during his lifetime as DNA and genes were not yet discovered.

In the late 19th and early 20th centuries, scientists observed chromosomes during cell division, supporting Mendel's units.

Exam Tip

The "units" Mendel described are what we now call genes.

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