Genetics problems 1 A man who is blood type O has learned the blood types of the people he thought were his parents His mother is blood type A and his father is blood type B He is convinced that he is really adopted because he should be blood type AB Is he correct in his thinking Why or why not No mom could be IAi dad could be IB i 2 A man with blood type O can be excluded as the father of a child with blood type a A b B c AB d O e he cannot be excluded 3 A man with blood type AB can be excluded as the father of a child with blood type a A b B c AB d O e he cannot be excluded 4 A man with blood type A can be excluded as the father of a child with blood type a A b B c AB d O e he cannot be excluded 5 A man with group A blood marries a woman with group B blood Their child has group O blood What are the genotypes of these individuals What other genotypes and in what frequencies would you expect in offspring from this marriage Man IA i woman I B i child ii 6 Can a man who is Rh be excluded as the father of a child who is Rh no 7 Could a person of blood type O safely receive a blood transfusion of blood type B no 8 Could a person of blood type AB safely receive a blood transfusion of blood type B yes 9 A woman who is blood type B and is Rh has a daughter who is blood type O negative and a son who is blood type B positive Rh D is dominant to Rh d Which of the following is a possible blood type for the son A IAi dd B IAi Dd C IBIB dd D IBi Dd E ii dd 10 The Mother A IAi dd B IAi Dd C IBIB dd D IBi Dd E ii dd 11 The Daughter A IAi dd B IAi Dd C IBIB dd D IBi Dd E ii dd 12 What is a possible phenotype for the father A IAi dd B IAi DD C IBIB dd D IBi DD E IAIA DD 13 A man with blood type A goes to court for a paternity case the mother of the child has blood type A If the child were which of these blood types would exclude the man from paternity a O positive b AB positive c A positive d A negative 14 Da is co dominant with Db The PHENOTYPIC ratios of a cross between two heterozygous individuals would be a 1 2 1 b 3 1 c 1 1 d 1 1 1 1 e 9 3 3 1 15 Da is co dominant with Db The GENOTYPIC ratios of a cross between two heterozygous individuals would be a 1 2 1 b 3 1 c 1 1 d 1 1 1 1 e 9 3 3 1 16 Color patterns in a species of duck is determined by one gene with 3 alleles Alleles H and I are codominant and allele i is recessive to both How many phenotypes are possible in a flock of ducks that contains all the possible combinations of these 3 alleles 4 H I HI i 17 Flower color in snapdragons is an example of incomplete dominance If a red flowered plant is crossed with a white flowered plant the F1 generation has pink flowers If a pink flowered plant is crossed with a pink flowered plant the progeny plants will be a 100 pink b 100 red c 25 red 50 pink 25 white d 25 white 75 red 18 In humans it is the contribution of the dad which determines the sex of the child 19 In humans in an X linked or sex linked trait it is the contribution of the mom which determines whether a son will display the trait 20 A recessive allele on the X chromosome produces red green color blindness in humans A colorblind man marries a heterozygous normal woman What percentage of their SONS will be color blind a 0 b 25 c 50 d 75 e 100 21 A colorblind man marries a heterozygous normal woman What percentage of their DAUGHTERS will be color blind a 0 b 25 c 50 d 75 e 100 22 A normal man marries a colorblind woman What percentage of their SONS will be color blind a 0 b 25 c 50 d 75 e 100 23 A normal man marries a colorblind woman What percentage of their DAUGHTERS will be color blind a 0 b 25 c 50 d 75 e 100 24 In birds the chromosomal sex determination system is males are ZZ and females are ZW Assume that there is a form of red green colorblindness in birds It is caused by a Z linked recessive allele A colorblind male bird rooster is crossed with a normal female bird hen What percentage of their MALE OFFSPRING will be color blind a 0 b 25 c 50 d 75 e 100 25 A colorblind rooster is crossed with a normal hen What percentage of their FEMALE OFFSPRING will be color blind a 0 b 25 c 50 d 75 e 100 26 For each gene on the X chromosome there is a corresponding gene on the Y chromosome a True b False 27 Albinism is an autosomal recessive trait A man and his wife both have normal pigmentation but both had a parent with Albinism 28 What are the genotypes of the man and his wife Aa for both 29 What percentage of children with albinism that the couple will have 25 30 What percentage of their children will be carriers for Albinism 50 31 A black guinea pig crossed with an albino guinea pig produces 12 black offspring When the albino is crossed with a second black one 7 blacks and 5 albinos are obtained What is the best explanation for the genetic situation Case 1 black must be AA albino is aa Case 2 black is Aa albino is aa 32 In tigers a recessive allele causes an absence of fur pigmentation a white tiger and cross eyed condition If 2 phenotypically normal tigers that are heterozygous at this locus mated what of their offspring will be cross eyed 25 What will be white 25 33 A man has 6 fingers on each hand and 6 toes on each foot His wife and daughter have the normal number of digits Extra digits is a dominant trait What fraction of this couple s children would be expected to have extra digits 50 34 What is the percentage of chance that a son will inherit an X linked recessive disease from his father a 0 b 25 c 50 d 75 e 100 35 What is the percentage of chance that a son will inherit an X linked recessive disease from his mother a 0 b 25 c 50 d 75 …
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