when the alleles for a gene are both expressed at the same time, we refer to this type of inheritance as?
incomplete dominance
the number of alleles/genes is
several
all normal humans have ___ chromosomes of each and every type
2
a man with type A blood marries a woman with type A blood. What are the chances of them having a child with type AB blood?
o%
in which kind of cross would you expect to find 9/3/3/1 ration in the F2 offspring?
dihybrid cross
two individuals are crossed: Aa x Aa. The recessive phenotype would be found in ____ of the offspring
25%
a man with type A blood marries a woman with type O blood. All the children have type O blood. Is this possible?
no, A blood is a dominant gene
a man with type AB blood marries a woman with type O blood. They have 2 children and adopt a 3rd. Which child is adopted?
if they put blood type it is the child with O blood otherwise, not enough info
dominant alleles are always expressed?
true
galactosemia is a genetic disorder involving the inability to metablize the sugar galactose. The disease (phenotype) is recessive, if one parent is a carrier (Aa) and the other is normal (AA), what are the chances of them having a galactosemic child?
0%
In a dihybrid cross between 2 individuals both heterozygous for 2 traits carried on non homologous chromosomes (AaBb x AaBb) What are the chances of having a homozygous recessive in the progeny?
1/16= 6.25%
a 3/1 ratio in the F2 generation is a ____ ratio
phenotypic
the human genome is composed of approximately ____ genes
25,000 - 27,000
biologically, cancer is uncontrolled ____
mitosis
RNA molecules leave the nucleus via the?
mRNA
DNA replication requires
DNA polymerase to catalyze enzymes
knows instructions
which type of nucleic acid is not found in both the cytoplasm and the nucleus?
RNA
the process of translation does not require
DNA template
the UV used in tanning booths is not carcinogenic?
false
which genetic disorder is a lysosomal disease?
tay sachs
In human genetics, x linked recessive traits are always expressed in males. This means the defective gene is carried on the Y chromosome. T OR F?
false
a galactosemic individual cannot metabolize ____ normally
lactose milk sugar
which genetic disorder is characterized by late on set of the symptoms?
huntingtons disease
the defective gene that causes hemophilia A is carried on the autosome (somatic chromosome) T OR F?
false, carried on x linked chromosome
thymine dimmers form by exposing DNA to a UV light T OR F
true
in a trihybrid cross (AaBbTt x AaBbTt), how many individuals would you predict would be homozygous dominant for all three traits?
3/4 x 3/4 x 3/4 = 27/64
a jewish man and woman fall in love, get married and are thinking about having children. Tay sachs disease is known in the man's family and is unknown in the woman's family. Do they have to be concerned about having a tay sachs child?
yes, the women could have a history with it
eye color in humans is controlled by a single gene, with two alleles T OR F
false, 15 genes
susceptibility to skin cancer is directly related to the complexion type, ie light skinned individuals have a lower risk than darker skinned individuals
false due to melanin
genes are?
inheritable traits
found at a specific location on a chromosomes
sequences of nucleotides on a DNA molecule
test crosses are required to determine the genotype of homozygous recessive individuals, t or f
false, dominant
dominant alleles are?
always expressed
which technique can be used to separate the components of a complex mixture of relatively small organic molecules from each other?
thin layer of chromatography
which technique is used to separate proteins from each other on basis of molecular mass?
electrophoresis
in the electrophoresis exercise, the protein profiles of the red and yellow shelled glyptodonts were the same, t or f?
false
a gene can have ___ alleles
several
dominant traits are inherently desirable, t or f?
true
recessive traits are inherently undesirable?
true
genotype refer to ____ an organism possesses with respect to some particular trait
genes
if two red shelled glyptodonts have a yellow shelled offspring....
each parent has a a recessive allele for shell color
in glyptodonts, shell color is an inherited trait, t or f
true
when two yellow shelled glyptodonts mate, their offspring will always have yellow shells, t or f
true
in glyptodonts, shell color is under control of ___ gene
1
in glyptodonts, the gene controlling shell has ___ alleles
2
based on the results of your chromatography experiments, does the gray pigment appear to be under control of the gene for shell color?
no
recessive alleles are always expressed, t or f?
false
red shelled glyptodonts are always homozygous dominant for shell color, t or f?
false
what is the probability of two yellow shelled glyptodonts having a red shelled offspring?
0%
if a female parent is a carrier, due to the presence of one copy of the recessive hemophilia A allele being carried on the X chromosome, what are the odds that she could have an affected male child?
50%
if all 13 CODIS markers are used to compare DNA samples, the chances that a match is due to chance is approx.?
50%
if both parents exhibit a recessive trait, what is the chance that their offspring will exhibit the dominant phenotype?
0%
in a dihybrid cross, between two individuals both heterozygous for two traits carried on nonhomologous chromosomes (AaBb x AaBb), what are the chances of having progeny that exhibit both dominant phenotypes?
9/16 = 56%
A 1/2/1 ratio in the F2 generation is a ____ ratio
genotypic
phenotype determines genotype, t or f?
false
crossing over occurs during?
prophase I
human sperm cells carry ____ chromosomes of each and every type
1
crossing over tends to ___ genetic diversity
increase
after meiosis, each haploid gamete carries one allele for each inherited trait
true
a recessive phenotype is only expressed in the __ condition
homozygous
when is the phenotypic ratio of the F2 is identical to genotypic ratio?
when the alleles are incompletely dominant
alleles are?
alternative forms of the same gene
oogenesis and spermatogenesis utilize
meiosis
mendel concluded that genes were particulate units of inheritance
true
if the probability of event A happening is 80%, you can expect the event to occur four times out of ?
5
bacteria divide by
binary fission
rabies is a bacterial disease, t or f?
false
in the urey/miller experiment, primordial life was created
false
most heterotrophic bacteria are involved in the process of decomposition, t or f?
