AP Bio Mendelian Genetics

Which of the following crossover events would be most difficult to detect in offspring?

• A crossover occurring in the region between gene A and G
• A crossover occurring in the region between gene G and T
• A crossover occurring in the region between gene T and B
• A crossover occurring in the region between gene A and T

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A wide range of phenotypic variations occur in the trait for human height.  Which of the following accounts for these variations?

• Polygenic Inheritance
• Codominance
• Incomplete dominance
• Multiple Alleles

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Map relative position of the four genes on a chromosome from the data on crossover frequencies.

• ABCD
• ADCB
• CABD
• CBAD

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Examine the image.  Which of the following would be the respective autosomal chromosome count for each organism?

• 46, 48, 50, 78
• 44, 46, 48, 76
• 23, 24, 25, 39
• 92, 96, 100, 156

The pedigree shown indicates the expression pattern of VHL in a specific family. Genetic counselors told the affected female that she and her non-carrier husband had a 50% chance of producing children with VHL.  Based on this information, which of the following best describes the inheritance pattern for this disorder?

• X-linked recessive
• Incomplete dominance
• Autosomal dominance
• Autosomal recessive

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Australian Shepherds are a breed of dogs whose coat color is directly impacted by two different genes. The gene that determines basic coat color exhibits a dominant allele (B) for black coat color and a recessive allele (b) for red coat color. Additionally, these dogs can have a solid coat color (mm) or a mixed pattern coat color called merle (Mm). The homozygous dominant coat color is called a lethal white (MM) which produces pups that are deaf and blind. What is the probability that two red Australian shepherds will produce a black pup?

• 0
• 1/4
• 1/2
• 3/4

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The Australian Shepherds of America Club discourages from mating two merles. Which of the following best explains why merle to merle matings are undesirable?

• The cross has the probability of producing litters with 50% solid coat color pups.
• The cross produces all homozygous recessive pups
• The cross has the probability of producing litters with 25% merle coat pups.
• The cross has a 25% chance of producing homozygous dominant pups.

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The diagram depicts an experiment in which ice packs were strapped to a hair-free patch on a species of rabbits. The new hair that grew in the patch exposed to cold was black.Which of the following statements is supported by the results of this experiment?

• The rabbits’ genomes have a flexible response to environmental stimuli.
• The rabbits change their phenotypes to attract mates.
• Rabbits whose coat color does not change represent a more evolved species
• Increased ultraviolet light can alter the genome of these rabbits.

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In horses, the grey coat color (G) is dominant to non-grey coat color (g). Additionally, some horses have a genetic disorder called hyperkalemic periodic paralysis or HYPP. HYPP is an inherited autosomal dominant disorder that affects the sodium channels in muscle cells. HYPP (H) is dominant to the normal condition (h). If a non-grey, normal stallion sires a foal that is not grey and does not have HYPP, which of the following genotypes are possible genotypes for the mother?

• GGhh and ggHH
• ggHH and GgHh
• GGHH and GGHh
• GgHh and gghh

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Many plant species are capable of producing offspring through self-pollination. In self-pollination, gametes formed by meiosis and are used to fertilize egg cells from the same plant. Which of the following statements describes why offspring produced through self-pollination can exhibit genetic diversity?

• The genes found in each gamete will be genetically identical to one another.
• The self-pollination gametes are produced through meiosis and have undergone DNA replication.
• Homologous chromosomes were sorted into different gamete cells causing separation of allele pairs.
• Gametes involved in self-pollination only travel a short distance prior to becoming involved in fertilization.

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