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35 Cards in this Set
- Front
- Back
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A gene located on a sex chromosome
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sex linked
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Greeding by self-pollination
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line breed
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A gene that exerts its influence only in the presence of certain sex hormones
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sex limited
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A protein substance on the surface of red blood corpuscles
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agglutinogen
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the founder of modern plant breeding
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Luther Burbank
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The condition of having a multiple of the normal number of chormosomes
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polyploied
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A gene that is dominant in one sex and recessive in the other
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sex influenced
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A condition in which blood does not clot
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hemophilia
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Twins who develop from separate ferilized eggs
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fraternal twins
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The man who discoverd the A-B-O blood groups
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Landsteiner
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The artificial crossing of two different varieties to produce a new one
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hybridation
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careful choosing of parents from a great number on individuals
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mass selection
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a drug that produces polyploidy
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colchicine
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twins who develop from a single fertilized egg
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identical
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a condition resulting from the presence of an extra 21st chormosome in humans
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down syndrome
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The Shasta daisy, plumcot and spineless cactus were developed by?
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Burbank
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Polyploidy can be produced artificially by using the drug?
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colchicine
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An example of a cross between two entirely different species is?
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beefalo= buffalo/horse
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A pink rose on a white rose bush is the result of what kind of mutation?
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bud mutation or sport
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If cleavage were halted during mitosis, while nuclear division continued, the result would be?
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polyploied
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Nondisjunction during meiosis in humans seems to produce?
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down syndrome
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New characteristics can appear very suddenly as a result of?
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mutation
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Inbreeding is also referred to as?
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line breeding?
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The number of chormosomes in humans is?
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46 or 23 pairs
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The blood type that is always evidence of a heterozygous condition is?
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AB
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A person who has neither of the two basic types of agglutinogens on his red corpuscles has blood type?
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O
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Population genetics is based on determinations of?
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gene frequencies
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Any differences existing between identical twins are due to thier
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environment
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The incidence of down syndrome tends to increase with the age of the?
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parents
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phenylketonuria (PKU) is an inherited condition resulting from the absence of a single?
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corresponding enzyme?
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A condition of uneven polyploidy, such as 3n or 5n would result in interference with?
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gamete production
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Uneven segregation of chromosomes during meiosis, resulting in an abnormal number of chromosomes in gametes is?
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nondisjunction
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A human with sex chromosomes XXX would probably be?
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fertile female, tall, well developed, retarted
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If an newborn baby has inherited two recessive genes for phenylketonuria, placing him on a diet free of phenylalanine would?
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prevent the expression of the genetic defect
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In the case of the sex-linked trait hemophilia, which of the following would have been impossible? (Who passing what to the son)
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for the father to pass it on to the son
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