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38 Cards in this Set
- Front
- Back
Alleles of a gene are found at _____ chromosomes |
the same locus on homologous |
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all of the offspring of a cross between a black-eyed beetle and an orange-eyed beetle have orange eyes. This means that the allele for the black eyes is _____ the allele for the orange eyes |
recessive to |
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all the offspring of a cross between a black-eyed rabbit and a red-eyed rabbit have black eyes. what is the expected phenotypic ratio of a cross between two red-eyed rabbits |
0 black-eyed: 4 red-eyed |
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all the offspring of a cross between a red-flowered plant and a white flowered plant have pink flowers. This means that the allele for red flowers is ____ to the allele for white flowers |
Incomplete Dominant |
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a color-blind woman carries a man who is not color blind. all of their sons, but none of their daughters, are color-blind. which of the following statements correctly explains these results? |
the gene for color vision is linked to the X chromosome. |
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Dr. Smith's parents have normal hearing. However, Dr. Smith has an inherited form of deafness. Deafness is a recessive trait that is associated with the abnormal allele d. the normal allele at this locus, associated parents could have which of the following genotypes? |
Dd and Dd |
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the expression of both alleles for a trait in a heterozygous individual (ex. person with AB blood) illustrates |
codominace |
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if A is dominant to a and B is dominant to b, what is the expected phenotypic ratio of the cross: AaBb x AaBb? |
9:3:3:1 |
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a mono-hybrid cross is |
a breeding experiment in which the parents differ in only one character |
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two chromosomes in a nucleus that carry loci for the same traits in the same positions on the chromosomes but specify different versions of some traits constitute a pair of |
homologous chromosomes |
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Using two six-sided die, what is the probability of rolling a 5 and a 6? |
1/6 x 1/6 = 1/36 |
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what is the excepted phenotypic ratio of the F2 generation of a mono-hybrid cross? |
3:1 |
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which of the following terms to the situation where a single phenotypic characteristics is determined by the addictive effects of two or more genes? |
polygenic inheritance |
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what are genetically linked genes? |
genes whose loci are nearer to each other are less likely to be separated onto different chromatids during chromosomal crossover |
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what does Mendal's 1:2:1 ratio describe? |
Genotype |
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What does it mean when " a man and woman have children, the man determines the sex of the child? |
a women will always donate the X chromosome to the zygote, while the male can neither donate another X chromosome to make the child a female or a Y chromosome to make the child a male |
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What is a di-hybrid cross? |
mating between to heterozygous organisms (Pp) |
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what is a dominate allele? |
will express its's phenotype of that of a recessive allele |
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what is a dominant genetic disorder? |
individuals who are homozygous recessive are symptom free |
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what is a genotype? |
genetic makeup of an organism (PP) |
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what is karyotype? |
image of individuals chromosomes arranged from longest to shortest |
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what is mono-hybrid cross? |
mating between two individuals with different alleles at one genetic locus of interest |
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what is an allele? |
different versions of the game gene (P or p) |
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what is a phenotype? |
appearance or expression of a characteristics (purple) |
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what is a recessive allele? |
will only express it's phenotype when paired with another recessive allele |
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what is a recessive genetic disorder? |
individuals who get the disorder are homozygous recessive |
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what is a testcross? |
mating between an individual of unknown genotype and a homozygous individual |
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what is complete dominance? |
if 2 alleles have a complete dominance relationship, the phenotype of the heterozygote will be indistinguishable from the phenotype of the homozygous dominant. |
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what is heterozygous? |
has two different alleles (Pp) |
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what is homozygous? |
has identical alleles (PP or pp) |
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what is hybrid? |
cross fertilization offspring of 2 different varieties |
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what is incomplete dominance? |
heterozygous differ from homozygous phenotypes example: colors -- (pink, red, white) |
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what is Mendal's Law of Segregation? |
2 copies of agent seperate in meiosis and end up in different gametes. Gametes carry only one allele for each gene |
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what is pleiotropy inheritance? |
one gene controls more than one phenotypic trait example: sickle cell |
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what is polygenic inheritance? |
many genes influence one trait example: skin color |
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what is Codominance? |
heterozygotes express 2 dominant alleles example: blood types |
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What is true breeding? |
self-fertilization produces offspring identical to parent |
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what is the significance of Mendel's 3:1 ratio? |
Phenotype |