26 Questions
What did Mendel observe about the first hybrid generation of offspring from crossing a pea variety with purple flowers to one with white flowers?
All had purple flowers, like one of the parents
What did Mendel observe among the second generation of offspring when he self-pollinated the first-generation hybrid plants?
Plants with both purple and white flowers
Why did Mendel propose that blending theory would not work in explaining his observations?
Because it predicts a uniform group of first-generation hybrid plants with light purple flowers
What did Mendel propose about the factors that control traits based on his observations?
They act like particles and do not blend together
How many copies of the gene that controls flower color did Mendel propose each individual pea plant to have in each cell of the plant body?
Two copies
What did Edward Tatum and George Beadle propose about genes?
Genes encode enzymes that carry out biochemical functions within cells
Where are Mendel's genes located?
On chromosomes
What is the physical nature of genes?
Deoxyribonucleic acid (DNA)
What was Fisher's insight about the inheritance of continuously variable traits?
Continuous traits are each controlled by multiple Mendelian genes
How do DNA molecules store information?
In the form of a double helix with sugar and phosphate groups
What did Mendel observe among the second generation of offspring when he self-pollinated the first-generation hybrid plants?
Plants with purple flowers as well as plants with white flowers
Why did Mendel propose that the blending theory would not work in explaining his observations?
It fails to account for the reappearance of the white flower trait in the second generation
According to Mendel, what are the factors that control traits similar to?
Particles
How many copies of the gene that controls flower color did Mendel propose each individual pea plant to have in each cell of the plant body?
Two
What did Mendel observe about the first hybrid generation of offspring from crossing a pea variety with purple flowers to one with white flowers?
All had purple flowers, just like one of the parents
Why would blending theory not work based on Mendel's observations?
It predicts a blend of purple and white flowers in the first-generation hybrid plants
Which scientist proposed that the gene for flower color comes in two gene variants, one for purple and one for white?
Gregor Mendel
Who demonstrated that continuously variable traits are controlled by multiple Mendelian genes, a concept known as the multifactorial hypothesis?
Ronald Fisher
Which scientists proposed the one-gene–one-enzyme hypothesis, suggesting that genes encode enzymes that carry out biochemical functions within cells?
Edward Tatum and George Beadle
Where did Edward Tatum and George Beadle conduct their experimental work on genes encoding enzymes using bread mold as their organism?
In bacteria
What is the physical nature of genes according to the information presented?
Deoxyribonucleic acid (DNA)
Which is the correct statement about how genes function inside cells to control different states for a trait such as flower color?
Genes encode proteins that control cell functions
What is the location of Mendel’s genes according to the chromosome theory of inheritance?
Chromosomes
What did Fisher propose about the inheritance of continuously variable traits?
Traits are each controlled by multiple Mendelian genes
Where did Tatum and Beadle conduct their experiments on gene encoding enzymes?
In bread mold
What did Mendel observe about the first hybrid generation of offspring from crossing a variety with purple flowers to one with white flowers?
They had a mix of purple and white flowers
Test your knowledge of Gregor Mendel's famous pea plant experiments and the principles of genetics. Questions may cover topics such as dominant and recessive traits, hybridization, and the laws of inheritance.
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