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50 terms

Bio Test 3

STUDY
PLAY
Human males have a dark spot on the edge of the nucleus (bar body) identifying the inactive x chromosome
False
Humans have 22 paits of autosomes and 2 pair of sex chromosomes
False
A carrier of a recessive genetic disorder usually does not express any symptomes of the disease
True
Linked genes are genes for different traits located on the same chromosome
True
The father actually dertermines the gender of the child
True
Mitosis followed by cytokinesis is teresponsible for all of the following except
Production of egg and sperm
Which phrase is marked by the arrival of chromosomes at the poles?
telophase
If you view a cell in which gentic material is beginning to be visible as seperate bodies, and the nuclear envelope has disappeard from view, you may surmise that the cell is in
prophase
The process that actually divides that parent cell into two daughter cells is called
cytokinesis
Spindle fibers
are used to ogranize and move chromosomes during mitosis
At the end of meiosis 1, the resulting two cells are
haploid and genetically different
What seperates in anaphase 1 of meiosis
homologus chromosomes
DNA replication occurs
between the gap phases of interphase
A diploid cell has
has two of each type of chromosome
Chromosomes that come from different parents yet are the same size and have the same genetice composition are
homologus chromosomes
The segeregation principle explains how each gamete
has only one copy of each gene
Which of the following does NOT produce genetic variation
Asexual reproduction
Which of the following molecules controls progress of the cell cycle?
growth factor controls
Crossing over
increases variablity in gametes
All but one of the following are characteristc of cancer cells choos the EXCEPTION
Essentially normal funcioning cells.. they just have lost control of cell division
The spread of cancer from one site to the others in the body is known as
metastasis
Sexual reprodution
results in new combinations of genetic traits
A leading cause of human reproductive failure and miscarriages is due to the fetus having an ancorrect number chromosomes whish is the cause
nondisjunction of chromosomes in meiosis 1 or 2
Different forms of a gene are known as
alleles
Homozygous dominant (AA) homozygous recessive (aa) and heterozygous (Aa) are terms used to describe and individuals
geneotype
Carriers are
heterozygous
Type AB blood is an example of ___ which means that the heterozygous display two phenotypes at the same time
codominace
Usually, an egg cell from a human female contains
one X chromosome
In a Punnett square, the letters with the little boxes represent
offspring genotypes
Recessive phenotypes
are only seen in homozygous recessive individuals
Duchenne muscular dystrophy is inherited from an X-linked recessive allele. What is the probability that a son with Duchenne MD inherited this disease from his biological father
0
An allele is ____ if its effects masks that of a ___ allele paired with it.
dominant, recessive
If short hair (L) is dominat to long hair (l), animals LL and Ll Have the same
phenotypes
If a pure-breeding long tail cat is crossed with a pure breeding cat with no tail, cand a cat with a chort tail, is produced the simplist explinaition is
an incompletely dominat gene
If one parent has type a blood and the other parent has type b then which of the following is possible in the children
A, B, AB, and O
Traits such as human eye color and height demonstrate continuous variations bc
they are influenced by several genes
Which of the following would be the LEAST satisfactroy orgainsm for genetic research?
Humans
Most genetic disorders in humans are the result of
X-linked inheritance
Which of the following can be determined by and individuals karyotype?
The number and structual composition of an individuals chromosomes
Occurs in somtic cells...
mitosis
gives rise to gametes...
meiosis
generally produces 4 daughter cells...
meiosis
required chromosome replicaiton must be complete before hand...
mitosis and meiosis
produces gentically identical daughter cells...
mitosis
increase genetic diversity in offspring...
meiosis
LL...
homozygous
Ll...
heterozygous
Long-Stemed plant...
phenotype
L and l...
alleles
Determines plant height...
gene