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Biology Multiple Choice Questions homework.........................




Question;1 of 20AABB x AAbb represents aDihybrid cross.Homozygous condition.Monohybrid cross.Heterozygous condition.2 of 20What is the condition called when an expressed trait is somewhere between homozygous dominant and homozygous recessive?Incomplete Dominance3 of 20Which of the following refers to the genetic make-up of an individual?PhenotypeAlleleGenotypeParental generationQuestion4 of 20Which of the following examples illustrates pleiotropy?In fruit flies, the genes for scarlet eyes and hairy body are located on the same chromosome.The human cystic firbrosis gene causes many symptoms, from respiratory distress to digestive problems.Matings between earless sheep and long-eared sheep always result in short-eared sheep.Wheat kernels can range from white to red in color, a trait controlled by several genes.Question5 of 20A true-breeding plant that produces yellow seeds is crossed with a true-breeding plant that produces green seeds. The F1 plants have yellow seeds. What is the expected phenotypic ratio of seed color of the offspring of an F1 ? F1 cross?1:2:12:13:19:3:3:1Question6 of 20A brown mouse is mated with a white mouse. All of their offspring are brown. If two brown offspring are mated, what fraction of their offspring will be white?AllNoneone-halfone-fourthQuestion7 of 20Mendel crossed true-breeding purple-flowered plants with true-breeding white-flowered plants, and all of the resulting offspring produced purple flowers. The allele for purple flowers issegregated.monohybrid.dominant.recessive.Question8 of 20Kelly is blood group AB, Jacob is blood group B, and their daughter is blood group B. Given this information, it would be impossible for the couple to have a child with which of the following blood groups?OABABQuestion9 of 20Attached earlobes are recessive to free earlobes. What is the probability of having a child with attached earlobes when an individual with attached earlobes mates with an individual heterozygous for free earlobes?0%%50%100%Question10 of 20Which of the following human genetic disorders is sex-linked?PKUHemophiliaCystic fibrosisAll of the aboveQuestion11 of 20In humans, the presence or absence of dimples is a trait controlled by a single gene. What is the genotype of an individual who is heterozygous for dimples?DDddDIDdQuestion12 of 20Mendel made some crosses where he looked at two characteristics at once: round yellow peas crossed with wrinkled green peas, for example. He did this because he wanted to find outwhether different characters were inherited together or plants and animals adapt to their new characters originated.whether the characters influence each other, for example, whether color affects degree of roundness.Question13 of 20An individual with the genotype AaBb produces four different gametes in equal proportions. This is a demonstration oflinkage.Mendel's law of independent assortment.Mendel's principle of segregation.crossing over.Question14 of 20Most sex-linked traits in humans are carried on the ________ chromosome, and the recessive phenotypes are seen most often in __________.X, womenX, menY, womenY, menQuestion15 of 20Chromosomes that are not sex chromosomes are calledcentrosomes.allosomes.dominant.autosomes.Question16 of 20A pea plant with purple flowers is heterozygous for flower color. Its genotype is Pp. The P and p alleles in the pea plant's cells are locatedat corresponding locations on homologous chromosomes.on the X and Y to each other on the same different locations on the same chromosome.Question17 of 20Hypohosphatemia (vitamin D-resistant rickets) is inherited as a sex-linked dominant trait. The relevant gene is found on the X chromosome. What is the expected outcome of a cross between a homozygous recessive woman and a man with hypophosphatemia?Fifty percent of their daughters and 50% of their sons exhibit hypophosphatemia.Seventy-five percent of their offspring exhibit hypophosphatemia.All of their daughters and none of their sons exhibit hypophosphatemia.All of their sons and none of their daughters exhibit hypophosphatemia.Question18 of 20When looking at the inheritance of a single character, Mendel found that a cross between two true-breeding peas (between purple and white, for example) always yielded a ______ in the F2 generation.1:1 phenotypic ratio3:1 genotypic ratio1:1 genotypic ratio3:1 phenotypic ratioQuestion19 of 20Which genotype would result in an individual with the recessive phenotype?aa onlyAa onlyAa or aaAA onlyQuestion20 of 20How many different types of gametes can be generated by an individual with genotype AaBB?1248


Paper#62719 | Written in 18-Jul-2015

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