Exam 1 Review
Red-green colorblindneess is an X-linked recessive trait in humans. If a woman who is a carrier (XBXb) for red-green color blindness marries a normal male (XBY) what percent of their daughters will be colorblind
0%
If you mate pea plants with the following genotype: TtYy x TtYy where alleles are T=Tall (dominant), t=short, Y=yellow seeds (dominant), y=green seeds, what ratio of short plants with green seeds would you expect?
1/16
Using mendel's flower color (purple is dominant, white is recessive), if a heterozygous plant (P/p) is crossed with a homozygous recessive (p/p), what is the probability that the first AND the second offspring will have purple flowers
1/4
in four o'clock plants, red flower color is dominant to white flower color. However, heterozygous plants have a pink color. If a pink-flowered plant is crossed with another pink-flowered plant, what will be the phenotypic ratios of their offspring?
1/4 red, 1/2 pink, 1/4 white
The pedigree below tracks Duchenne Muscular Dystrophy (DMD) through several generations. DMD is an X-linked recessive trait. If individuals I-1 and I-2 had another son, what is the chance he'd have DMD
100%
How many Barr bodies would an individual with a XXX genotype possess
2
If you mate pea plants with the following genotype: TtYy x TtYy where alleles are T=Tall (dominant), t=short, Y=yellow seeds (dominant), y=green seeds, what ratio of Tall plants with green seeds would you expect?
3/16
A human skin cell in G0 has _____ chromosomes.
46
immediately after S-phase of the cell cycle, your somatic cells are:
4n
If you mate pea plants with the following genotype: TtYy x TtYy where alleles are T=Tall (dominant), t=short, Y=yellow seeds (dominant), y=green seeds, what phenotypic ratio would you expect for this dihybrid cross? HINT: it obeys the traditional Mendelian inheritance
9:3:3:1
Phenylketonuria (PKU) is caused by _____
A defective enzyme
among different species, sex may be determined by ______
All of the above (differences in sex chromosomes, differencess in the number of sets of chromosomes, environmental factors)
gregor mendel, the greatest geneticist of all time, failed the exam to become a high school teacher twice and remained a substitute teacher through the resst of his life. Identify a major accomplishment by Gregor.
All of the above (was the first person to use quantitative analysis to describe heredity, discovered the law of independent assortment, discovered the law of segregation, identified the nature of alleles and classified them as dominant or recessive)
In Mirabilis jalapa (the four o'clock plant) leaves can be green, white or variegated (with both green and white sectors). If you matee a solid white female and a solid green male, what would you expect the progeny to look like? HINT: think about chloroplasts
All white
What is the reason for sexual reproduction
Creates variation without mutation
Male bees (drones) are ______
Diploid
jean baptiste lamarck postulated an absurd theory of evolution that species evolve, in part, based upon use and disuse of their anatomy....Which of the fields of study below suggest that Jean Baptiste lamarck was actually correct, at least in part, in his theory
Epigenetic inheritance
Human somatic cells in G0 (not proliferating) have 44 total chromosomes (21 pairss of autosomes and 1 pair of sex chromosomes)
False
Which of the following represents the correct order of events during the prophase I of meiosis
Leptotene - zygotene - pachytene - diplotene - diakinesis
In pea plants (and humans), how genes are passed to offspring is explained by ____ and how alleles are passed to offspring is explained by _____, respectively
Mendel's law of independent assortment; Mendel's law of segregation
If a gene is located on the X chromosome, but not the Y, it is said to be an example of ____
Sex-linkage
an individual with the type IAi blood and an individual with type IBIA blood mate and have offspring. what is the probability that they will have a type O child?
Zero
A photographic representation of the chromosomes of a cell is also known as _______
a karyotype
if the Igf2 gene is silenced in the allele donated by the mother, what would you expect the following mating to produce. [Igf2- is a mutant allele that when homozygouss results in dwarf pups]
all normal sized pups
a woman who is heterozygous for pattern baldness marries a man who i nonbald. Which of the following would be true of theie offspring?
all of the females would be nonbald, 1/2 of the males would be bald
A different version of the same gene in a species is a (an)
allele
in human blood groups, the fact that an individual can have an AB blood type is an example of
codominance
a neurological condition that travels in a family. A member of the family approachess you, the astute BIOL310 sstudent, for a diagnosis. What is the type of inheritance pattern shown in the pedigree below
dominant disease
With the exception of Barr bodies, chromosomes can be visualized by brightfield microscopy ______
during mitosis
what is the type of inheritance that is based on a reversible modification of genomic DNA that results in the alleles of only one parent being transcriptionally active
epigenetic
A Y-linked gene is passed from ____
father to son
Calico cats have a calico coat pattern that is only observed in
female cats that are heterozygous for the coat color alleles (B/b)
humans are ______
heterogametic
what is the explanation for reduced numbers of white-eyed recessive flies vs the expected number in the famous thomas hunt morgan experiment
lethal allele
during which phase of mitosis do the chromosomes line up in the center of the cell
metaphase
what is the molecular mechanism for imprinting a gene
methylation
Which of the following would contain genetic material that is 100% identical?
sister chromatids
where does erasure and imprinting occur
sperm cells and oocytes
Maternal effect (think snail shell twist) can be suggested when:
the phenotype of the progeny match the genotype of the mother
genetic variation is ultimately based upon which of the following
variations in nucleotide sequence of the DNA
