MASTERING BIO CH9 ACTUAL QUESTIONS AND

MASTERING BIO CH9 (ACTUAL / ) 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 1 / 2

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

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