Ch. 9 Bio Test

30 Questions  I  By RachelDobrin

  
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1.  How did Mendel's studies in genetics differ from earlier studies of breeding and inheritance?
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2.  A true breeding fruit fly would be ___ for a certain characteristic.
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3.  When looking at the inheritance of a single characteristic, Mendel found that a cross between two- true breeding peas (between purple and white, for example) always yielded a ___ in the F2 generation.
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4.  Alternative forms of genes for a particular characteristic are called
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5.  A fruit fly has two genes for eye color, but each of its sperm cells has one. This illustrates
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6.  Mendel made some crosses where he looked at two characterisitcs at onece- round yellow peas crossed with wrinkled green peas, for example. He did this because he wanted to find out
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7.  A 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 located
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8.  When an indididual has both Ia and Ib blood group alleles, both genes are expressed and the individual has group AB blood. This is an example of 
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9.  How many genes are there on one chromosome?
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10.  Which of the following is not true of linked genes?
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11.  Morgan and his students were able to map the relative positions of genes on fruit-fly chomosomes by
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12.  Most sex-linked traits in humans are carried on the __ chromosome, and the recessive phenotypes are seen most often in 
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13.  The most lethal genetic disease in the USA is 
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14.  Which of the following human genetic disorders is sex-linked?
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15.  A brown mouse is mated with a white mouse. All of their offspring are brown. If two of these brown offspring are mated, which fraction of these offspring will be white?
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16.  Suppose you wanted to know the genotype of one of the brown F2 mice in the previous question. The easiest way to do it would be to
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17.  Some dogs bark while trailing; others are slient. The barker gene is dominant, the silent gene recessive. The gene for normal tail is dominant over the gene for screw (curly) tail. A barker dog with a normal tail who is heterozygous for both characteristics is mated to another dog of the same genotype. Which fraction of their offspring will be barkers with screw tails?
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18.  Two heterozygous tall pea plants with purple flowers are crossed. The probability that one of their offspring will have white flowers is 1/4. The probability that one of their offspring will be short is 1/4. What is the probability that one of their offspring will be short with white flowers?
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19.  A young unmarried woman had a baby and wished to collect child support from the father. Her blood group is AB. The baby's blood group is A. There are two possible fathers: Jim is group A, and Michael is group O. Which man could be the father?
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20.  Which of the following illustrates pleiotropy?
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21.  When two gray-bodied fruit flies are mated, their offspring total 86 gray-bodied males, 81 yellow-bodied males, and 165 gray-bodied females. The allele for yellow body is
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22.  Red-green color blindness is a human recessive sex-linked trait. A man and a woman with normal vision have a color-blind son. What is the probability that their next child will also be a color-blind son?
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23.  On a pedigree tracking the inheritance of PKU, a horizontal line joins a black square and a hlaf black circle. What fraction of this couple's children would you expect to suffer from PKU?
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24.  Duchenne muscular dystrophy (DMD) is caused by a sex-linked recessive. Its victims are invariably boys, who usually die before the age of 20. Why is this disorder almost never seen in girls?
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25.  Which of the following would be most useful for preventing a particular genetic disease?
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26.  Edward was found to be heterozygous (Ss) for sickle-cell trait. The alleles represented by S and s are
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27.  Whether an allele is dominant or recessive depends on
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28.  Two fruit flies with eyes of the usual red color are crossed, and their offspring are as follows: 77 red-eyed males, 71 ruby-eyed females, 152 red-eyed females. The allele for ruby color is 
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29.  In some of his experiments, Mendel studied the inheritance patterns of two characteristics at once-folower color and pod color, for example. He did this to find out
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30.  A man who has B blood type and a woman who has A blood type could have children of which of the following phenotypes?
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