bio 1404 jaffe exam 5
phenotype due to change in gene regulation
A chromosomal inversion is most likely to affect
IAi
A persons has type A blood. one of the parents has O type blood. That persons genotype must be
aneuploidy
Trisomy 21 is an example of
0%
Two genes are located the farthest from each other on a single chromosome assuming no crossing over recombination frequency for these genes is expected to be
development
X inactivation occurs during
barr bodies
X inactivation results in
gene expression
a chromosomal deletion is most likely to affect
true breeding pink flowering plant
a flowering plants obeys mendelian genetics where the yellow flower is dominant over pink flowers you are given a yellow flowering plant. what type of plant would you use to perform a test cross with thus plant to determine its genotype
polyploidy and aneuploidy
a karyotype can used to most readily identify
homozygous for that trait
a recessive will be observed in an individual who is
16
an organsim with the genotype PpTtRrSs can ________ different gametes
an orange fur phenotype
cat fur color is located on x chromosome. Because of X inactivation a cat that is homozygous for orange fur color will have
more distant from each other on same chromosome
crossing over is more likely between two genes at are
non disjunction
down syndrome is typically the result of
1/32
for a cross between a pear plant with the genotype PpYyRr and with another PpyyRr the probability of the offspring having the genotype ppYyrr is
fertilization, crossing overn IA
genetic variation can occur as a result of
16
given 4 different charateristics assuming independent assortment how many different types of gamestes are possible
males are hemizygous for the X chromosome
hemophilia is recessive sex linked disorder where a persons blood does not clot properly. Males are more likely affected by this disorder than females because
dipliod
human somatic cells are
EC
humans have 2 unlinked genes one for unattached or attched earlobes (E or e) and the other for the ability to curl the tounge (C or c) if someones genetype is ECc which of the following is possible gamete phenotype of that person
no effect is observed because it only produces an effect between non homologous chromosomes
if reciprocal translocation occurs between homologous pairs of chromosomes
on the same chromosome
if two genes are linked they are
25%
in horses, black is dependent upon a dominant gene, B, and chestnut upon its recessive alle;e, b. the trotting gait is due to a dominant gene,T, the pacing gait to its recessive allele, t,. If a heterozygous black trotter (BbTt) is mated to a homozymgous chestnut trotter (bbTT) how many of the F1 generation will be heterozygous black trotter (BbTt)
0
in pea plants tall is dominant to short. if a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will short
the genes for cinnabar eye color and crooked leg shape are on the same chromosome and very close to each other
in some fruit flies, the mutant cinnabar eye color always inherited another mutations crooked legs. there never appears to be any recombination of these traits with wild type traits this observation is best explained by which of the following
chromosomal inversion
in which of the following is there no gain or loss of DNA
meiosis
independent assortment occurs during
the arrangement to homologous pairs of chromosomes during metaphase 1 of meiosis
mendels law of independent assortment relates to
the seperation of homologous chromosomes during anaphase 1 of meiosis
mendels law of segregation arises from
haploid
normal gamates produced by homozygous individual are always
1/2
pea plant flower colors may be purple or white. if purple is dominant when a heterozygous plant is crossed with ahomozygous white flowering plant what is probability that the offspring will be
create a genetic map
recombination frequency for several mutant phenotypes located on the same chromosomes can be used to
the physical distance between 2 alleles on the same chromosomes
recombination frequency is a function of
the same phenotypic and genotypic ratios
snapdragons exhibit incomplete dominance crossing a red true vbreedimg plant with a white true breeding plant yields a pink F1 gen. self pollination of the f1 gen yields f2 offspring with
25%
suppose the brown allele for eye color (B) is completely dominant over the blue allele for eye color (b) what is the prob. that two heterozygous brown eyed parents produce a child tht is blue eyed
incomplete dominance
the cross of two individuals resuslts in offspring with 1:2:1 phenotype ratio for a pat. trait. what does this suggest
the parents were heterozygotes
the cross of two results in offsring with 3;1 ratio for a particular trait assuming mendelian genetics what does this suggests
located on different chromosomes
the fact tht all characteristics mendel studied exhibited independent assortment implies tht each of these alleles were
phenotype
the obervable trait of an organism is called its
25%
the pedigrees above track duchenne muscular DMD through several generations. DMD is an X linked recessive trait. Males are square symbols and females are circles. Affected imdividuals are filled symbols. If individuals I-1 and I-2 had another son, what is the chance that he would have DMD
50%
the probability tht 2 carriers of an autosomal recessive allele have offspring expressing the phenotype
the same phenotype as the parents, the same genotype as the parents
true breeding blue flowering plants always have progeny tht are
epistasis
when one gene affects the expression of another gene, this is generally referred to as
pleiotropy
when one gene has multiple phenotypic effects we call this
dividing white blood cells
which cell would be best to use for determining the karyotype of an idividual
sex linked traits
which of the following concepts is not attributable to mendel
it may result in gametes with n+1 chromosomes and it may result in gmaetes with n-1 chromosomes
which of the following is true regarding non disjunction
the white allele is recessive
white flowering plants were not observed in the F1 generation following a cross of true breeding purple and white flowering plants in Mendels monohybrid cross experiment because
traits are easily identifies, short lifecycle
why are pea plants a good model system for studying genetics
mutation
you have a set of plant that are true breeding for green seeds. after 20 generations, you find offspring tht have yellow seeds. this occurred because
