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Baldness is a recessive trait that generally occurs ONLY in males. What mode of inheritance would
this be?
• Sex linked
The 23rd pair of chromosomes that differ in males and females are called ____________
• Sex chromosomes
Which mode of inheritance would the alleles for a trait be written
as superscripts on only the X chromosome
• Sex linked trait
List 2 environmental (external) factors that can influence gene expression?
• Temperature• Radiation• Light• Chemicals• Virus/Bacteria
Why do sex-linked traits occur more often in males than females?
•Males are missing the part of the Y
chromosomes that has these traits
I.
II.
The following pedigree shows individuals with blue eyes. Blue
eyes are recessive to brown. What is the dad’s genotype?
• Bb
In a karyotype, chromosomes are matched according to ________, _______, and_____
•Size,•Banding Patterns,•Centromere location
I.
II.
The following pedigree shows individuals with blue eyes. Blue eyes are recessive to
brown. What is the sex of their oldest kid?
• boy
_____ is a mutation that occurs when a segment of a chromosome breaks off and
is reinserted backwards
Inversion
____ mutation causes an error in DNA that adds or deletes a single base that causes all the following
amino acids to be affected
Frame shift mutation
What type of inheritance has the phenotype of the heterozygous offspring showing BOTH traits of
the homozygous parents?
Codominance
What type of inheritance is shown when the trait occurs more frequently
in one sex than another?
Sex-Linked
Suppose you were looking at a pedigree and you saw an individual’s genotype was labeled “R?”. What does
that genotype represent?
Dominant phenotype. But, you do not know if the other
allele is dominant or recessive
What type of inheritance is exhibited when there
are more than 2 possible alleles for a certain trait
or phenotype?
Multiple alleles
A mother who is heterozygous for type A blood marries a
man who is homozygous for B blood. What are the blood genotypes of the children?
• 50% IAIB
• 50% IBi
What type of inheritance pattern would you use a prime (‘) to
notate the alternate form of an allele?
Incomplete dominance