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23 Cards in this Set
- Front
- Back
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How many chromosomes are there in a person's body cells?
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46
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Each form of a gene is called a?
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allele
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Blood groups are determined by
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multiples alleles
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Which chromosome carries few genes for traits other than gener?
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Y
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An example of a sex linkedtrait is?
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male-pattern baldness
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Why are there more colorblind males than there are colorblind females?
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a female has to inherit 2 recessive genes for colorblindness to be colorblind. A male has to inherit only 1 gene for colorblindness to be colorblind.
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What combination of alleles must a person inherit to have group O blood?
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OO
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The failure of chromosome pairs to seperate during meiosis is called?
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nondisjunction
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The disorder in which the blood does not clot normally is?
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hemophilia
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In amniocentesis
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cells in the fluid surrounding the baby are tested for genetic disorders
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Most differences between identical twins are a result of
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environmental factors
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In down syndrome, there is an extra chromosome on the?
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21 pair
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Identical twins?
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develop from the same fertilized egg.
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Sex linked traits are carried on the?
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X chromosome
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A chart that shows the relationship among individuals in a family is called a?
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pedigree
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An example of a sex-influenced trait is?
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male-pattern baldness
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Which of the following shows the size, number, and shape of all the chromoses in an organism?
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karyotype
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A pair of alleles that are equally dominant are?
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codominant
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Human blood groups are determine by?
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3 alleles
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XO is what gender combination of genotypes?
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female
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What gender combination of genotypes is XXY
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male
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What is trisomy-21?
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down syndrome
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Are sex influenced traits carried on the X chromosome? What is the reason why sex influenced traits are expressed differently in males and females?
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No. Men have different hormones than women.
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