Reproduction at the Cellular Level, The Cellular Basis or Inheritance, Patterns of Inheritance
A deletion in chromosome 5
A baby born with nervous system abnormalities and a cry that sounds like a cat probably has
heterozygous for the trait and able
A carrier of a genetic disorder who does not show symptoms is most likely to be ___ to transmit offspring
An aneuploidy of the sex chromosomes
A child born with aneuploidy and no visible symptoms most likely has
duplication
A chromosome that has two copies of the same gene likely experienced a/an
1
A human gamete ___ sex chromosomes.
44
A human somatic cell has ___ auto-aimed in all.
Female
A tortoise shellcat is most certainly
homozygous recessive
An individual who expresses a recessive trait has a genotype that is
homozygous
An individual who possesses a homologous pair of chromosomes with matching alleles at a particular locus is ___ for the trait encoded by the gene of that locus.
phenotype
An individuals expressed traits is its
produces offspring that are genetically identical to each other
Asexual reproduction ___.
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
homologs separate
During anaphase I of meiosis I,
crossing over
During meiosis, sister chromatids no longer have the same combination of alleles due to ___.
Tetrads are aligned on the metaphase plate
During metaphase I of meiosis I,
homologous pairs align, forming a tetrad.
During synapsis of meiosis,
metaphase
During which phase of mitosis do the chromosomes line up in the middle of the cell.
telophase
During which phase of mitosis does the nuclear envelope re-form?
True
Each member of a homologous pair of chromosomes has the same genes.
Their parents' gametes.
From where does a persons genomic DNA originate?
False
Homologs are 100% identical to each other in every way with no variation ever.
inversion
If a homologous pair of chromosomes has a section where the genes cannot align because the genes are in reverse order from each other then one do the chromosomes likely experienced a/an
eoistasis
If the protein product of one gene affects the expression of another gene, this is an example of
a pair of homologs with their genes and centromeres aligned
In the context of meiosis, a tetrad is
one diploid, four haploid
Meios begins with ___ cells with ___ cells.
Which of the following statements best describes why dominant alleles that cause lethal (deadly) disorders are less common than recessive alleles that cause lethal disorders.
Most individuals carrying a lethal dominant allele have the disorder and die before they reproduce, whereas individuals carrying a lethal recessive allele are more likely to be healthy and reproduce.
sister chromatids
Prior to mitosis and after S phase, each chromosome of a eukaryotic cell consists of a pair of identical structures called
men need to inherit only one copy of the recessive allele for the condition to be fully expressed
Sex-linked conditions are more common in men than in women because
joined together at a centromere
Sister chromatids are
the same locus on homologous
The alleles of a gene are found at ___ chromosomes.
codominance
The expression of both alleles for a trait in a heterozygous individual illustrates
two diploid cells
The first round of meiosis produces,
the S phase.
The genetic material is duplicated during
DNA
The molecule that contains the encode for your trait
True
The number of chromosomes in a cell's nucleus is the same as the number of DNA strands in a cell's nucleus.
True
The number of chromosomes in a diploid cell is twice the number of chromosomes in a haploid cell.
True
The number of chromosomes in a gamete is half the number of chromosomesin a zygote.
True
The number of chromosomes in a zygote is twice the number of chromosomes in a gamete.
prophase
The phase of mitosis during which the mitotic spindle begins to form is
Chromatids with new combinations of Alleles
The result of crossing over is
four haploid cells
The second round of meiosis produces ___.
XX
The sex chromosome complement of a normal human female is
False
True or False: During metaphase I, the orientation of homologs of one tetrad is linked ot the orientation of the homologs of the other tetrads
A variation of a gene, which means a variation in a nucleotide sequence of a gene that results in a variation in the protein product of the gene.
What best describes an "allele"?
gametes with too few or too many chromosomes
What best describes the general consequences of a nondisjunction during meiosis?
A daughter with a monosomy of the sex chromosomes
What can result from fertilization between a euploid sperm and an egg missing a sex chromosome?
telophase and cytokinesis
What cellular events happen at the same time?
The cell will divide into two plant cells.
What event will immediately follow the event shown in the folowing image?
proto-oncogenes
What is a gene that regulates the cell cycle?
one X chromosome and one Y chromosome
What is the normal complement of sex chromosomes in a human male?
Karyotype
When examining the structure of a person's chromosomes under the microscope, you are seeing the person's
The embryo splits into two embryos.
Which is NOT a reason why siblings are genetically unique?
They provide the homologs for each of the zygote's homologous chromosome pairs.
Which is TRUE about gametes?
They have the same DNA as the zygote from which they arose.
Which is TRUE about human somatic cells?
They have all of the same genes on the same loci.
Which is true of homologs in a pair of homologous chromosomes?
It produces haploid cells.
Which statement is true of meiosis?
A cancerous tumor
You are asked to culture an unidentified sample of animal tissue. You notice that the cells seem to fail to exhibit density-dependent inhibition. The source of this tissue sample is most likely
is called a sex-linked gene
any gene located on a sex chromosome
All the offspring of across between a red-flowered-plant and a-white-flowered plant have pink flowers. This means that the allele for red flowers is ___ to the allele for white flowers.
incompletely dominant
