Mendell's Study Guide #4

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how did mendel’s studies in genetics differ from earlier studies of breeding and inheritance

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mende’s work was more qunatitative

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a true-breeding fruit fly would be ____ for a certain characteristic

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homozygous dominant or recessive

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when looking at the inhertiance of a single characteristi , mendel found that aa cross between two true-breeding peas always yielded a ____ in the F2 generation

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3:1 phenotypic ratio

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mendel made some crosses where he looked at two characteristics at once-round yellow peas crossed with wrinkled green peas, for example. he did his because he wanted to fidn out

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whether different characteristics were inherited together or separtely

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a pea plant with purple flowers is heterozyous for flower color. its genotype is Pp. The P and p alleles in the pea plant’s cells are located

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at corresponding locations on homologous chromosomes

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how many genes are there on one chromosome

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thousnads

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a young woman had a baby. her blood group is AB. the babys blood group is A. there are two posible fathers: Jim is group A, and Michael is group O. which man could be the father

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either

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which of the following illustrates pleiotrohpy

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human cystic firosiss gene causes many symptoms, from respiratory distress to digestive problems

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when two gray bodied frruit flies are mated, tehri offspring total 86 gray bodied males, 81 yellow bodied males, and 165 gray bodied females. the allel for yellow body is

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sex linked and recessive

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red-green color blindness is a human recessive sex-linked trait. a man and a woman with normal vision hav e acolor blind son. what is the probability that their next child will also be a color blind son

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1/4

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which of the folowing would be most useful for preventing a particular genetic disorder

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being able to identify carriers

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which of the following is not ture of linked genes

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they are realitvely rare, most genes are unliked

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T.H. Morgan and his students were able to map the relative positions of genes on fruit fly chromosomes by

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loking at crosses that showed independt assortment

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most sex-linked traits in humans are carried on the ____ chromosome, and the recessive phenotypes are seen most often in___

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X…. men

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the most common fatal genetic disease in US is

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cystic fibrosis

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the Y chromsome is useful for tracing ancestory becasue

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it is passed on virtually unchanged

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which of the following human genetic disorders is sex linked

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hemophilia

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a brown mouse is mated with a white mouse. all of their offspring are brown. if two of these brown offspring are mated, what fraction of their offspring will be white

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1/4

Question 1

two heterozygou stall pea plants with purpole flowers are crossed. the probability that one of theri offspring will have white flowers is 1/4. the proabilty that one will be short is 1/4. wht is the probability that one of their offspring will be short with white flowers

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1/16