Unit 4 Mendelian Genetics and Punnett
Squares UPDATED ACTUAL Exam
Questions and CORRECT Answers
homozygous dominant - CORRECT ANSWER - Both alleles for a trait are the same and
dominant (AA).
homozygous recessive - CORRECT ANSWER - Both alleles for a trait are the same and
recessive (aa).
heterozygous - CORRECT ANSWER - One allele for a trait is dominant and the other
allele is recessive.
genotype - CORRECT ANSWER - An organism's genetic makeup. The Punnet Square
"code letters."
phenotype - CORRECT ANSWER - An organism's physical appearance, or visible traits.
Punnett Square - CORRECT ANSWER - A chart that shows all the possible combinations
of alleles that can result from a genetic cross.
gene - CORRECT ANSWER - A segment of DNA on a chromosome that codes for a
specific trait.
allele - CORRECT ANSWER - An alternative form of a gene.
dominant allele - CORRECT ANSWER - An allele whose trait always shows up in the
organism when the allele is present.
Squares UPDATED ACTUAL Exam
Questions and CORRECT Answers
homozygous dominant - CORRECT ANSWER - Both alleles for a trait are the same and
dominant (AA).
homozygous recessive - CORRECT ANSWER - Both alleles for a trait are the same and
recessive (aa).
heterozygous - CORRECT ANSWER - One allele for a trait is dominant and the other
allele is recessive.
genotype - CORRECT ANSWER - An organism's genetic makeup. The Punnet Square
"code letters."
phenotype - CORRECT ANSWER - An organism's physical appearance, or visible traits.
Punnett Square - CORRECT ANSWER - A chart that shows all the possible combinations
of alleles that can result from a genetic cross.
gene - CORRECT ANSWER - A segment of DNA on a chromosome that codes for a
specific trait.
allele - CORRECT ANSWER - An alternative form of a gene.
dominant allele - CORRECT ANSWER - An allele whose trait always shows up in the
organism when the allele is present.
