Name:______
Take Home Exam
Due: Friday March 3rd, 2017
1. The two genes or alleles that combine to determine a trait would be the organism's ______.
2. Type AB blood, having two genes dominant for a trait, is an example of ______.
3. ______dominance results in the blending of genes in the hybrid. Give an example using flower color.
4. The ______is the physical feature such as round peas that results from a genotype.
5. The two genes for a trait represented by capital & lower case letters are called ______.
6. If both alleles are the same, is the genotype homozygous or heterozygous? Write an example.
7. The genes for sex-linked traits are usually carried on which chromosome?
8. Describe how you can determine whether a disorder is sex-linked or autosomal given a pedigree.
9. The father is Type A. The mother type B. They have a child with type O blood. This is possible? Explain. Show the Punnett square proving or disproving it.
10. Colorblindness is sex-linked. If a female carrier mates with a normal male, what is the probability they have color blind child?
11. Define polygenic inheritance and give an example in humans
12. When crossing a homozygous recessive with a heterozygote, what is the chance of getting an offspring with the homozygous recessive phenotype?
13. In rabbits, the allele for long hair (h) is recessive to the allele for short hair (H). When a short-haired female was mated with a long-haired male, the offspring consisted of five short-haired and three long-haired rabbits. The genotypes of the parent rabbits must be:
14. In snapdragons, heterozygotes have pink flowers, whereas homozygotes have red or white flowers. When plants with red flowers are crossed with plants with white flowers, what proportion of the offspring will have pink flowers?
15. Homozygous dominant guinea pigs are white. Homozygous recessive guinea pigs are black. Heterozygous guinea pigs are spotted with both black and white. This is an example of…
16. In 1944 Charlie Chaplin was involved in a legal battle over the paternity of a child born to Joan Berry, a young starlet. The baby was blood type B, the mother A, and Chaplin O. From what you know about the inheritance of blood types, could Chaplin have been the father of the child? (At the time of the trial, blood group evidence was not admissible in California courts. Charlie Chaplin was declared responsible for the child's support.)
17. During one of Mendel’s experiments, •Generation I, true-breeding, long-stemmed pea plants were crossed with true-breeding, short-stemmed pea plants. •In Generation II all the plants were long-stemmed. When the Generation II plants were cross-pollinated among themselves, the percentage of short-stemmed pea plants in Generation III was likely to be…
18. The trait for tall pea plants is (T) and the trait for short pea plants is (t). The trait for smooth peas is (S) and the trait for wrinkled is (s). Two plants are crossed yielding an F1 generation with 612 tall plants with smooth peas and 188 short plants with wrinkled peas. What is most likely the genotype of the parent generation?
19. The gene for Rh+ blood is dominant over the gene for Rh- blood. An Rh- woman whose mother was Rh- marries a Rh+ man, both of whose parents were Rh+. What percentage of their children will be expected to be Rh+?
20. Hemophilia is a genetic disease that has plagued the royal houses of Europe since the time of England's Queen Victoria, who was a carrier. Her granddaughter Alexandra married Nicholas II, the last Tsar of Imperial Russia. Alexandra was a carrier of the gene for hemophilia; Nicholas was normal. Their son, the Tsarevich Alexis, was afflicted with the disease. Alexis and his four sisters are all thought to have been killed at the outbreak of the Revolution of 1917. Who is likely a carrier?
21. Theoretically, if a carrier hemophiliac married a normal male, what percentage of their male offspring would be expected to be carriers?
22 .True/False-Use “T” for True and “F” for False
1. ______You have two alleles for every trait
2. ______In blood type, A and B alleles are incompletely dominant to each other
3. ______Women are more likely to get X-linked recessive diseases than men
4. ______The father is responsible for determining the sex of the child
5. ______When alleles are incompletely dominant, there are four possible phenotypes
6. ______. If a woman is Bb, then ¼ of the eggs she produces should have B
7. ______XX is the genotype for a man
23.Use the pedigree below to answer questions
1. What is the genotype of the son of the first generation parents?
a. NN b. Nn c. XNXn d. XnYn e. XnY
2. What is the probability of person 1 passing on the color blind trait?
a. 0% b. 25% c. 50% d. 75% e. 100%
3. Person 5 is color blind. However, his sons do not have this condition. What accounts for this?
a. Sons receive gene for color blindness from mother
b. Sons receive gene for normal vision from mother c. male children cannot be color blind d. mutation occurred d. cannot determine from this diagram
4. Person 6 is __?
a. homozygous dominant b. homozygous recessive
c. heterozygous d. color blind
5. What is the phenotype of individual 4?
a. Normal female b. color blind female
c. colorblind male d. Nn e. XNXn
6. Which of the following is true of the trait shown in the pedigree?
a. It is dominant b. It is dominant, Y-linked
c. It is recessive, Y-linked d. It is incompletely dominant
e. It is recessive, X-linked
7. What is the relationship between person #2 and person #11
a. grandmother, granddaughter b. uncle, nephew
c. grandmother, grandson d. grandfather, granddaughter
8. What is the relationship between person 4 and person 6?
a. sisters b. sister, brother c. sisters-in-law d. brothers-in-law
9. Which of the following is true about the trait shown in the pedigree?
a. It follows the rule of dominance b. It shows incomplete dominance
c. It shows co-dominance d. It cannot be predicted