B incomplete dominance and is explained by the

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B. Incomplete dominance and is explained by the presence of 50% enzyme in the heterozygote leading to ~50 % of pigment formation. C. Co-dominance and is explained by the presence of 100% enzyme in the heterozygote leading to ~50 % of pigment formation. D. Incomplete dominance and is explained by the presence of 100% enzyme in the heterozygote leading to ~50 % of pigment formation. E. Co-dominance and is explained by the presence of 100% enzyme in the heterozygote leading to 100 % of pigment formation.
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10. Two individuals show two different traits each by controlled by single gene. The male A shows an X-linked dominant trait (with complete penetrance in both sexes), whereas female B shows an autosomal dominant trait that is fully penetrant. Individual B is heterozygous for trait allele. The chance that their female offspring shows both traits is ______ and that their male offspring shows both traits is _________ percent. A. 100% for female and 0% for male B. 100% for female and 50% for male C. 25% for female and 75% for male D. 50% for female and 0% for male E. 66% and 33% 11.Phenylketonuria is an autosomal recessive disorder due to mutations in the gene encoding the enzyme: A. Alcohol dehydrogenase B. Phenylalanine isomerase C. Telomerase D. Phenylalanine hydroxylase E. Phenylalanine synthase 12. Extensions of Mendelian inheritance such as incomplete penetrance, incomplete dominance, co-dominance suggest that in these cases: A. only law of segregation of alleles is applicable B. only law of independent assortment is applicable C. both laws are not applicable D. both laws are still applicable E. none of the above is correct 13. The Arctic fox changes its pigmentation according to the season. In the cold winter it is white and in warm summer it is mostly brown. This is most likely due to : A. change in the sunlight and variable tanning B. temperature sensitive nature of the enzyme making pigment C. change in its diet D. none of the above
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14. The two alleles for flower colors in four-o’clock plants C R and C W show incomplete dominance. A pink-flowered four-o’clock plant (C R C W ) is crossed to a red-flowered plant (C R C R ). What is the expected outcome for the offspring? A. All pink B. All red C. 1 red: 2 pink: 1 white D. 1 red: 1 pink E. none of the above 15. A person with type AB blood has a child with a person with type AB blood. What are the possible blood types of the child? A. either A or B B. either A, B or O C. either A, B or AB D. AB only E. O only 16. A baby has type B blood. If the mother has blood type A, what are the possible blood groups for the father. A. A type only B. B type only C. B or O type only D. B, AB or O type E. B or AB type 17. It is usually safe to transfuse blood from an individual who is O Rh+ to an individual who is AB Rh- A. True B. False 18. A new species of cats was discovered in Europe. Four possible coat patterns were observed for this species as shown below. Top Hat Question
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19. Analyze the two pedigrees shown below and choose the statement that is CORRECT. 20. Which of the following inheritance pattern cannot be represented by the pedigree shown below: A. Autosomal recessive B. Autosomal dominant C. X-linked recessive D. X-linked dominant E. None of the above A. Pedigree 1 may represent autosomal dominant inheritance but not autosomal recessive inheritance B.
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  • Fall '15
  • Gene B, Zygosity, Sex linkage

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