MASTERING BIO CH9 (ACTUAL 2025/2026) QUESTIONS AND
VERIFIED CORRECT ANSWERS| GRADED A+
A red snapdragon (RR) is crossed with a white snapdragon (rr). R is
known to be incompletely dominant to r. Members of the F1
generation are then crossed. What is the ratio of flower colors in the
F2 generation? - ---Answers_-----1 red: 2 pink: 1 white
Fur color in dogs is a/an ________. Black fur on a Labrador retriever
is a/an ______. The black fur is the result of the interaction between
two _____. - ---Answers_-----character: trait: alleles of a gene
Imagine that four genes on a single chromosome in a mutant
phenotype of Drosophila cross over at half the normal rate as in the
wild-type phenotype. How, if at all, would genetic maps of that
chromosome differ between this mutant and the wild-type fly? - ---
Answers_-----The order of genes would be the same, but the four
genes in the mutant would be closer together than in the wild type.
Which of the following is the best definition of a "wild-type" trait? - -
--Answers_-----a trait that is most common in nature
In a family pedigree to trace a trait of interest, an empty circle
represents a/an _______. A blackened square represents a/an
_______. ("Affected" means "has trait of interest"; "unaffected"
means "Does not have trait of interest.") - ---Answers_-----unaffected
woman: affected man
, In Labrador retrievers, black coat is dominant to chocolate, normal
vision is dominant to progressive retinal atrophy (PRA), and normal
hip joint is dominant to hip dysplasia. The alleles for all of these traits
assort independently. Two dogs that are heterozygous for alleles of all
three genes are crossed. Using the rules of probability (not a Punnett
square), what is the chance that the first pup born to these dogs will be
black, have PRA, and have hip dysplasia? - ---Answers_-----3/64
Which of the choices most accurately summarizes Mendel's law of
segregation as expressed using modern genetic terminology? - ---
Answers_-----Alleles separate from each other (segregate) during
gamete formation.
Which of the following did Mendel NOT investigate in his extensive
studies of heredity? - ---Answers_-----the effects of the environment
Crossing over of genes on homologous chromosomes during meiosis
leads to which of the following? - ---Answers_-----gametes that are
different from the parental gametes
Which of the following prenatal diagnostic tests involves the least risk
to the mother or fetus AND is most informative regarding genetic
disorders? - ---Answers_-----tests of fetal cells or DNA in mother's
blood
What are the main signs or symptoms of the most common lethal
genetic disorder in the United States? - ---Answers_-----excess
mucous production that affects the lungs, liver, and other organs
VERIFIED CORRECT ANSWERS| GRADED A+
A red snapdragon (RR) is crossed with a white snapdragon (rr). R is
known to be incompletely dominant to r. Members of the F1
generation are then crossed. What is the ratio of flower colors in the
F2 generation? - ---Answers_-----1 red: 2 pink: 1 white
Fur color in dogs is a/an ________. Black fur on a Labrador retriever
is a/an ______. The black fur is the result of the interaction between
two _____. - ---Answers_-----character: trait: alleles of a gene
Imagine that four genes on a single chromosome in a mutant
phenotype of Drosophila cross over at half the normal rate as in the
wild-type phenotype. How, if at all, would genetic maps of that
chromosome differ between this mutant and the wild-type fly? - ---
Answers_-----The order of genes would be the same, but the four
genes in the mutant would be closer together than in the wild type.
Which of the following is the best definition of a "wild-type" trait? - -
--Answers_-----a trait that is most common in nature
In a family pedigree to trace a trait of interest, an empty circle
represents a/an _______. A blackened square represents a/an
_______. ("Affected" means "has trait of interest"; "unaffected"
means "Does not have trait of interest.") - ---Answers_-----unaffected
woman: affected man
, In Labrador retrievers, black coat is dominant to chocolate, normal
vision is dominant to progressive retinal atrophy (PRA), and normal
hip joint is dominant to hip dysplasia. The alleles for all of these traits
assort independently. Two dogs that are heterozygous for alleles of all
three genes are crossed. Using the rules of probability (not a Punnett
square), what is the chance that the first pup born to these dogs will be
black, have PRA, and have hip dysplasia? - ---Answers_-----3/64
Which of the choices most accurately summarizes Mendel's law of
segregation as expressed using modern genetic terminology? - ---
Answers_-----Alleles separate from each other (segregate) during
gamete formation.
Which of the following did Mendel NOT investigate in his extensive
studies of heredity? - ---Answers_-----the effects of the environment
Crossing over of genes on homologous chromosomes during meiosis
leads to which of the following? - ---Answers_-----gametes that are
different from the parental gametes
Which of the following prenatal diagnostic tests involves the least risk
to the mother or fetus AND is most informative regarding genetic
disorders? - ---Answers_-----tests of fetal cells or DNA in mother's
blood
What are the main signs or symptoms of the most common lethal
genetic disorder in the United States? - ---Answers_-----excess
mucous production that affects the lungs, liver, and other organs
