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Terms in this set (54)
Which if the following statements regarding hypothesis about inheritance is false?
The blending hypothesis suggests that all of the traits of the offspring come from either the mother or the father
Mendel conducted his most memorable experiment on
Which of the following statements regarding cross-breeding and hybridization is false?
The hybrid offspring of a cross are the P1 generation.
Which of the following statements regarding genotypes and phenotypes is false?
An organism with two different alleles for a single trait is said to be homozygous for that trait.
All the offspring of a cross between a black-eyed Mendelian and an orange-eyed Mendelian have black eyes. What is the expected phenotypic ratio of a cross between two orange-eyed Mendelian?
0 black-eyed:1 orange-eyed
The phenotypic ratio resulting from a dihybrid cross of two heterozygote individuals showing independent assortment is expected to be
a mating between an individual of unknown genotype and an individual homozygous recessive for the trait of interest.
Imagine that we mate two black Labrador dogs with normal vision and find that three of the puppies are like the parents, but one puppy is chocolate with normal vision and another is black with PRA (progressive retinal atrophy, a serious disease of vision). We can conclude that....
the alleles for color and vision segregate independently during gamete formation
Dr. Smith's parents have normal hearing. However, Dr. Smith has an inherited form of deafness. Deafness is a recessive trait that is associated with the abnormal allele d. The normal allele at this locus, associated with normal hearing, is D. Dr. Smith's parents could have which of the following genotypes?
Dd and Dd
Most people afflicted with recessive disorders are born to parents who were
not affected at all by the disease.
Which of the following statements regarding genetic testing is false?
Most human genetic diseases are treatable if caught early
Genes located close together on the same chromosomes are referred to as ________ genes and generally ________.
linked; do not sort independently during meiosis
The mechanism that "breaks" the linkage between linked genes is
What is the normal complement of sex chromosomes in a human male?
one X chromosome and one Y chromosome
Sex-linked conditions are more common in men than in women because
men need to inherit only one copy of the recessive allele for the condition to be fully expressed.
Justin has type A blood and his wife Brittany has type B blood. Justin's parents both have type AB blood, and Brittany's parents also both have type AB blood. What are the chances that Justin and Brittany's son Theodore has type A blood?
With the exception of identical twins, siblings who have the same two biological parents are likely to look similar, but not identical, to each other because they have
a similar but not identical combination of genes
Eukaryotic chromosomes differ from prokaryotic chromosomes in that they
are housed in a membrane-enclosed nucleus
Eukaryotic cells spend most of their cell cycle in which phase?
The genetic material is duplicated during:
the S phase
During which phase of mitosis do the chromosomes line up on a plane equidistant from the two spindle poles?
Which of the following statements regarding the function of mitosis is false?
Mitosis allows organisms to generate genetic diversity
Which of the following statements regarding mitosis and meiosis is false?
Mitosis produces daughter cells with half the number of chromosomes as the parent cell
During which stage of meiosis do synapsis and crossing over occur?
Without crossing over,
genetic recombination could not occur
can reveal alterations in chromosome number
Which of the following statements regarding Down syndrome is false?
Down syndrome is least likely to be seen in the infants of mothers over 40
Nondisjunction occurs when
members of a chromosome pair fail to separate
When observing a chicken skin cell in G2 under a microscope, you count 156 total chromatids. How many chromosomes does a male chicken have in its sperm cells?
You are a medical student and are reviewing a case study about a past patient. The patient was 4 feet 8 inches tall at age 38, was unable to have children, and had an above-average intelligence. The patient also had an irregular number of chromosomes. What diagnosis would you give the patient?
Which of the following people conducted the experiments that demonstrated that DNA is the genetic material of bacteriophages?
Hershey & Chase
The monomers of DNA & RNA are
Which of the following statements regarding RNA is false?
RNA uses the sugar dextrose.
How would the shape of a DNA molecule change if adenine paired with guanine and cytosine paired with thymine?
The DNA molecule would have irregular widths along its length.
The shape of a DNA molecule is most like
a twisted rope ladder
uses each strand of a DNA molecule as a template for the creation of a new strand
When one DNA molecule is copied to make two DNA molecules, the new DNA contains
50% of the parent DNA
Which of the following options best depicts the flow of information when a gene directs the synthesis of a cellular component
DNA → RNA → protein
Experiments have demonstrated that the "words" of the genetic code (the units that specify amino acids) are
In the genetic code:
many amino acids are specified by more than one codon.
Which of the following takes place during translation?
the conversion of genetic information from the language of nucleic acids to the language of proteins
Any change in the nucleotide sequence of DNA is called
Consider the following sentence: "The dog did not eat." Which of the following variations of this sentence is most like a base substitution mutation?
The doe did not eat
In the 1920s, Frederick Griffith conducted an experiment in which he mixed the dead cells of a bacterial strain that can cause pneumonia with live cells of a bacterial strain that cannot. When he cultured the live cells, some of the daughter colonies proved able to cause pneumonia. Which of the following processes of bacterial DNA transfer does this experiment demonstrate?
What is the transcription product of the sequence GCTAGCGATGAC?
The genes for the enzymes of glycolysis
are active in all metabolizing cells, but the genes for specialized proteins are expressed only in particular cell types
The tortoiseshell pattern on a cat
results from X chromosome inactivation
The coding regions of a gene are called
The cloning of Dolly the sheep
demonstrated that the nuclei from differentiated mammalian cells can retain their full genetic potential.
Which of the following statements regarding stem cells is false?
Adult, but not embryonic, stem cells can be grown in laboratory culture
When DNA from two sources is combined into one single piece of DNA, it is known as
cut DNA at specific sites
The polymerase chain reaction relies upon unusual, heat-resistant ________ that were isolated from bacteria living in hot springs
Gel electrophoresis sorts DNA molecules on the basis of their:
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