Introduction to Genetics

Gregor Mendel used pea plants to study

• flowering

• gamete formation

• the inheritance of traits

• cross-pollination

Offspring that result from crosses between parents with different traits

• are true-breeding

• make up the F2 generation

• make up the parental generation

• are called hybrids

The chemical factors that determine traits are called

• alleles

• traits

• genes

• characters

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Different versions of genes created by mutations are called

• alleles

• chromosomes

• nucleotides

• gametes

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The principle of dominance states that

• all alleles are dominant

• all alleles are recessive

• some alleles are dominant and some are recessive

• alleles are neither dominant or recessive

When Gregor Mendel crossed true-breeding tall plants (TT) with true-breeding short plants (tt), all the offspring were tall because

• the allele for tall plants is recessive

• the allele for short plants is dominant

• the allele for tall plants is dominant

If a pea plant has a recessive allele for green peas, it will produce

• green peas if it also has a dominant allele for yellow peas

• both green peas and yellow peas if it has a dominant allele for yellow

• green peas if it does not also have a dominant allele for yellow peas

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If you flip a coin, what is the probability that it will come up tails?

• 1/2 (50%)

• 1/4 (25%)

• 1/8 (12.5%)

• 1 (100%)

A heterozygous tall pea plant is crossed with a short plant. The probability that the F1 plant (the offspring) will be tall is

• 25%

• 50%

• 75%

• 100%

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Different versions of genes created by mutations are called

• alleles

• chromosomes

• nucleotides

• gametes

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