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20 Cards in this Set
- Front
- Back
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in pedigree analysis, the individual marked with an arrow is
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the 1st affected family member to be identified
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if a trait is inherited in an autosomal recessive fashion, what is not true
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two affected individuals can have an unaffected child
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parents with normal pigmentaton have an albino chil
what is the chance that their next child wll have normal pigmentation? |
75%
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almost all cases of cystic fibrosis arise as a result of mating between 2 unaffected parents. why?
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the gene is very common
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in sickle cell anemia, homozygotes produce
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an abnormal form of hemoglobin
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in autosomal dominant inheritance
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2 affected individuals may have unaffected children
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if a man expresses an x-linked recessive trait, we can draw what conclusion
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his mother was heterozygous or homozygous
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y-linked traits are
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hemizygous
known to skip alternative generations of males carriers only by males and transmitted only in males |
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the genetic concept of linakge means
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2 genes are on the same chromosome
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a child born is born with a lethal dominant allele.
this would seem to be impossible since either parent, had they possessed this allele, would have suffered its lethal effects. wat are the possible explanations? |
a) spontaneous mutation
b) varying expressivity and not always lethal c) delayed onset |
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in continuous traits such as height, crossing a tall and short organism will produce F1 that is all
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intermediate height
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The tall and short phenotypes in pea plants are example of
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discontinuous traits
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which of the following is not a characteristic of continuous variation
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only a single gene pair contributes to the phenotype
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in assessing the interaction between genes and the environment, which statement is most correct?
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the phenotype is produced by interaction of genotype and the environment
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the heritability of a trait can be defined as
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the proportion of variability in a population that is caused by genetic variance
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if a trait has a heritability of 1.0 this means that
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all variations in the population is caused by genotypic differences
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why are fingerprints useful in the study of heritability
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they are objectively measured and do not change
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it has frequently been observed that musical ability runs in familes.
this indicates that musial ability is |
no determinations can be made from these facts alone
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twins are said to be concordant for a trait when
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both twins exhibit the trait
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the phenomenon of regression to the mean that is observed in polygenic traits is brought about by
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dominance, additive effects, gene interaction, and environmental effects
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