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This quiz contains 14 questions from a mix of 1 subtopics.
What does the term 'allele' refer to?
an organism's physical characteristics as determined by its genotype and environment
different versions of the same gene, coding for variants of a characteristic
a sequence of bases on a DNA molecule that codes for a protein, which results in a characteristic
an organism's genetic makeup
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What is the definition of genotype?
an organism's genetic makeup - its alleles
an organism's physical characteristics as determined by its genotype and environment
different versions of the same gene, coding for variants of a characteristic
a sequence of bases on a DNA molecule that codes for a protein, which results in a characteristic
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What does the term 'phenotype' refer to?
a sequence of bases on a DNA molecule that codes for a protein, which results in a characteristic
an organism's physical characteristics as determined by its genotype and environment
an organism's genetic makeup - its alleles
different versions of the same gene, coding for variants of a characteristic
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What is a dominant allele?
an allele that is not expressed in the presence of another dominant allele
an allele that is expressed only when two copies are present
an allele only expressed if two copies are present
an allele that is expressed even when only one copy is present
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What is a locus?
an allele that is expressed when only one copy is present
an organism with two different alleles for a trait
the specific position of a gene on a chromosome
an organism with two identical alleles for a trait
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What is a homozygous organism?
an organism with two different alleles for a trait
the specific position of a gene on a chromosome
an allele that is expressed when only one copy is present
an organism with two identical alleles for a trait
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What is a heterozygous organism?
an organism with two different alleles for a trait
an organism with two identical alleles for a trait
an allele that is expressed when only one copy is present
the specific position of a gene on a chromosome
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What is the F1 generation?
offspring from a cross between two heterozygous F1 individuals
offspring from a cross between individuals with homozygous dominant and heterozygous genotypes
offspring from a cross between individuals with homozygous recessive and heterozygous genotypes
offspring from a cross between individuals with homozygous dominant and homozygous recessive genotypes
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What is the F2 generation?
offspring from a cross between two heterozygous F1 individuals
offspring from a cross between individuals with homozygous recessive and heterozygous genotypes
offspring from a cross between individuals with homozygous dominant and heterozygous genotypes
offspring from a cross between individuals with homozygous dominant and homozygous recessive genotypes
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What is a test cross?
a cross between two organisms with unknown genotypes
a cross between an organism with a dominant phenotype but an unknown genotype and an organism that is homozygous recessive
a cross between an organism with a dominant phenotype but an unknown genotype with an organism that is homozygous dominant
a cross between an organism with a recessive phenotype but an unknown genotype with an organism that is homozygous recessive
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What is the outcome of a test cross if all the offspring are heterozygous?
the unknown parent’s genotype is homozygous recessive
the unknown parent’s genotype remains unknown
the unknown parent’s genotype is heterozygous
the unknown parent’s genotype is homozygous dominant
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What is the outcome of a test cross if half of the offspring are heterozygous and half are homozygous recessive?
the unknown parent’s genotype is unknown
the unknown parent’s genotype is homozygous recessive
the unknown parent’s genotype is homozygous dominant
the unknown parent’s genotype is heterozygous
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What are the offspring genotypes if a short pea plant (tt) is bred with a pea plant of an unknown genotype to produce 50% short pea plants and 50% tall pea plants?
tt and Tt
tt and tt
tt and TT
TT and Tt
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What is the unknown genotype of the parent if a short pea plant (tt) is bred with a pea plant of an unknown genotype to produce 50% short pea plants and 50% tall pea plants?
unknown
TT
tt
Tt
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