Failed quiz questions: 6,7,12,4,18,19,22,8 Flashcards
Cytokinesis (cytoplasmic division) in animal cells
- begins with the deposition of a very rigid lipid bilayer, which is the major constituent of the cell wall
- all of these
- occurs when the plasma membrane is pulled inward by a ring of microtubules that has become attached to the cell plate
- begins with various deposits of material associated with vesicles and with groups of microtubules at each pole of the nucleus
- usually follows nuclear division
- usually follows nuclear division
Crossing over usually occurs in which of the following stages of meiosis?
prophase I
telophase II
anaphase II
metaphase I
interphase
Prophase I
The sequence of subunits in the DNA “backbone” is:
–sugar–base–sugar–base–sugar–base–sugar–base-
–base–sugar–phosphate–base–sugar–phosphate-
–phosphate–sugar–phosphate–sugar–phosphate–sugar
–base–phosphate–base–phosphate–base–phosphate-
–phosphate–sugar–phosphate–sugar–phosphate–sugar
James Watson and Francis Crick
established the principle of base pairing
established the double-stranded nature of DNA
all of these
explained how DNA’s structure permitted it to be replicated
proposed the concept of the double-helix
All of these
In mitosis, the centrioles move to opposite poles of the cell during prophase.
True
False
True
During meiosis II
Cytokinesis results in the formation of a total of two cells.
Homologous chromosomes separate.
Sister chromatids of each chromosome are separated from each other.
Sister chromatids exchange parts.
Homologous chromosomes pair up
Sister chromatids of each chromosome are separated from each other.
The DNA segment that carries information coding for a particular amino acid is a:
gene
triplet
nucleotide
deoxyribose sugar
phosphate group
triplet
The sister chromatids become separated during what phase of meiosis?
metaphase I
telophase I
anaphase I
anaphase II
prophase II
Anaphase II
Cri-du-chat is caused by a/an
inversion
translocation
duplication
autosomal dominant
deletion
deletion
A man who carries a harmful sex-linked (on the X chromosome) gene will pass the gene on to:
All of his sons
Half of his daughters
All of his daughters
Half of his sons
All of his children
All of his daughters
A couple has a daughter who is color-blind. The mother is not color-blind, but the father is. What is the genotype of the mother for this trait?
two dominant alleles
one abnormal Y chromosome, one normal X chromosome
two recessive alleles
three dominant alleles
one dominant allele, one recessive allele
One dominant allele, one recessive allele
If flower color of the offspring was 25% white and 75% red, and flower color were inherited by complete dominance, the parents genotypes must be
one homozygous recessive, the other heterozygous.
all red.
both homozygous dominant.
both heterozygous.
one homozygous dominant, the other heterozygous.
Both heterozygous
If a child has an AB blood type, the parents:
can have different blood types, but neither can be blood type O
must be A and B, but not AB
can be any blood type
must both have different blood types
must both be AB
can have different blood types, but neither can be blood type O
An X-linked carrier is a
homozygous dominant female
homozygous male
heterozygous male
heterozygous female
homozygous recessive female
heterozygous female
Cystic fibrosis is a genetic disorder that results from the inheritance of two recessive alleles. What is the chance that a child will inherit the disorder if one parent is heterozygous for this gene and one parent has cystic fibrosis?
25%
50%
0%
100%
75%
50%
Two brown dogs mated. Their offspring were five brown puppies and two white puppies. The most probable genotypes of the two brown dogs are
both Bb
both BB
Bb and bb
BB and Bb
BB and bb
Both Bb
Identify the mode of inheritance for each of the following traits: baldness
incomplete dominance
codominance
inheritance of a dominant-lethal allele
sex-influenced trait
X-linked inheritance
polygenic inheritance
sex-influenced trait
Alterations in chromosome number can occur with any chromosome, but most alterations are not seen in human populations because:
the genotype still represents a normal condition.
they are lethal during fetal development.
the phenotype is expressed in a continuous range in a given population and thus does not stand out.
the phenotype of homozygous recessive.
most are corrected during the first mitotic event in the fertilized egg.
they are lethal during fetal development
Codominance occurs when:
Offspring exhibit several different phenotypic expressions of a single trait
Expression of 2 different alleles alternates from one generation to the next
Both of the alleles in a heterozygote are expressed phenotypically in an individual
A heterozygote expresses an intermediate phenotype
Both of the alleles in a heterozygote are expressed phenotypically in an individual
Endocrine Module:
Match each of the following hormones to its target organ.
prolactin
stomach
muscles and bones
breasts
adrenal cortex
thyroid
ovary, testis
anterior pituitary
kidney
breasts
Endocrine Mod:
The adrenal medulla produces:
aldosterone
testosterone
epinephrine
cortisol
epinephrine
Endocrine Mod:
The body’s major metabolic hormone is called:
calcitonin
adrenaline
thyroid hormone
growth hormone
prolactin
thyroid hormone
Which gland releases FSH and LH?
Anterior pituitary
Which hormone controls the release of FSH and LH from anterior pituitary?
Gonadotropin hormone (GnRH) from the hypothalamus
Endocrine Mod:
Alcohol inhibits the secretion of:
prolactin (PRL)
oxytocin
parathyroid hormone (PTH)
glucagon
antidiuretic hormone (ADH)
antidiuretic hormone (ADH)