Genetics Test 5
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- in pedigree analysis, the individual marked with an arrow is
- the 1st affected family member to be identified
- if a trait is inherited in an autosomal recessive fashion, what is not true
- two affected individuals can have an unaffected child
-
parents with normal pigmentaton have an albino chil
what is the chance that their next child wll have normal pigmentation? - 75%
- almost all cases of cystic fibrosis arise as a result of mating between 2 unaffected parents. why?
- the gene is very common
- in sickle cell anemia, homozygotes produce
- an abnormal form of hemoglobin
- in autosomal dominant inheritance
- 2 affected individuals may have unaffected children
- if a man expresses an x-linked recessive trait, we can draw what conclusion
- his mother was heterozygous or homozygous
- y-linked traits are
-
hemizygous
known to skip alternative generations of males
carriers only by males and transmitted only in males - the genetic concept of linakge means
- 2 genes are on the same chromosome
-
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 - in continuous traits such as height, crossing a tall and short organism will produce F1 that is all
- intermediate height
- The tall and short phenotypes in pea plants are example of
- discontinuous traits
- which of the following is not a characteristic of continuous variation
- only a single gene pair contributes to the phenotype
- in assessing the interaction between genes and the environment, which statement is most correct?
- the phenotype is produced by interaction of genotype and the environment
- the heritability of a trait can be defined as
- the proportion of variability in a population that is caused by genetic variance
- if a trait has a heritability of 1.0 this means that
- all variations in the population is caused by genotypic differences
- why are fingerprints useful in the study of heritability
- they are objectively measured and do not change
-
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
- twins are said to be concordant for a trait when
- both twins exhibit the trait
- the phenomenon of regression to the mean that is observed in polygenic traits is brought about by
- dominance, additive effects, gene interaction, and environmental effects