Genetics BIO-351 Test #1 QUESTIONS WITH CORRECT ANSWERS| LATEST UPDATE
GUARANTEED SUCCESS
The stage of mitosis when sister chromatids separate from each other and migrate to opposite
poles of a cell is called ___________. Anaphase
During which of the following stages of the cell cycle would a chromosome consist of only a
single chromatid? G1
Which of the following stamens applies to homologous chromatids? They contain the same
genes in the same order but may have different alleles of some genes.
Drosophila melanogaster has four Paris of chromosomes. Super from this specifies are formed
by a meiotic process in which homologous chromosomes pair and segregate by do not undergo
crossing over. How many genetically different kinds of sperm could be produced by a
drosophila melanogaster male? 16
Nondisjunction can occur at either the first or second division of meiosis. XYY humans would
most likely arise from nondisjunction at the ___________ meiotic division in the ___________.
second, father
Nondisjunction can occur at tier the first or second division of meiosis. XXY humans could arise
from nondisjunction at the ___________ meiotic division in the ___________. First, Mother
Second, Mother
,First, Father
Second, Father
Crossing over between homologous chromosomes occurs at which stage of meiosis?
Prophase 1
Humans have 22 pairs of autosomes plus one sex chromosome pair. How many autosomes are
present in a normal human primary spermatocyte? 44
Pre-meiotic germ cells that divide mitotically in females are referred to as ___________.
Oogonia
The cells in which meiosis occurs in males are referred to as ___________. Spermatocytes
A chromosome with two arms of equal length is referred to as ___________; Metacentric
At which stage of meiosis would homologous chromosomes be paired? Prophase of Meiosis
1 OR Metaphase of Meiosis 1
The mitotic stage during which chromosomes being attached to spindle fibers and moving
randomly and reversibly to the centrosomes is ___________. Pro-Metaphase
,If a geneticists were to closely examine the make-up of a single autosomal chromosome from
one of your cells, that chromosome would be found to be ___________. A mosaic of genes
derived from just two of your grandparents - either your maternal grandparents, or your
paternal grandparents.
If you are a male, your X chromosome contain genes derived from ___________. Both your
maternal grandfather and grandmother
The chromosomal structure to which spindle fibers attach during the mitotic divisions is
referred to as ___________. Kinetochore.
Microtubules that attach to centrosomes but not chromosomes and that interdigitate with
microtubules emanating from the centrosome at the opposite pole are known as ___________.
Polar Microtubules
Mitosis results in ___________ in chromosome number while meiosis results in ___________
chromosome number. no change in, a reduction by half in
Cells said to be in the G0 state: Are in an extended G1 phase and no longer cycling.
Cells in G2 state of the cell cycle have ___________ as cells of the same species in the G1 stage.
twice as many chromosomes
, A cross between a white-eyed female fruit fly and a red-eyed male would generate which of the
following types of progeny? Red-eye females and white-eyed males.
A female fruit fly with singled bristles was mated with a male from a true-breeding wild-type
stock with long bristles. All of the F1 females had wild-type bristles and all fo the F1 males had
singled bristles. If the F1 flies are intercrossed, the expected ration of long to single bristles in
the F2 flies is: 1:1 in both sexes
Red-green color blindness is controlled by an X chromosomal gene in humans. A normal man
and women whose fathers are both color-blind marry. What is the probability that their first
child will be color-blind. 1/4
Hemophilia is caused by an X-linked mutation in humans. If a woman whose parental uncle
(father's brother) was a hemophiliac married a man whose brother is also a hemophiliac, what
is the probability of their first child have hemophilia (note: assume no other hemophilia in the
pedigree and no hidden carriers). 0
A white-eyed female fruit fly is mated to a red-eyed male. One of their progeny is a white-eyed
female. What is the likely karyotype of this white-eyed daughter? XXY
A white-eyed female fruit fly is mated to a red-eyed male. One of their progeny is a white-eyed
female. This white-eyed daughter likely arose from nondisjunction of the sex chromosomes
during ___________ in the ___________. Meiosis I or II, Mother
GUARANTEED SUCCESS
The stage of mitosis when sister chromatids separate from each other and migrate to opposite
poles of a cell is called ___________. Anaphase
During which of the following stages of the cell cycle would a chromosome consist of only a
single chromatid? G1
Which of the following stamens applies to homologous chromatids? They contain the same
genes in the same order but may have different alleles of some genes.
Drosophila melanogaster has four Paris of chromosomes. Super from this specifies are formed
by a meiotic process in which homologous chromosomes pair and segregate by do not undergo
crossing over. How many genetically different kinds of sperm could be produced by a
drosophila melanogaster male? 16
Nondisjunction can occur at either the first or second division of meiosis. XYY humans would
most likely arise from nondisjunction at the ___________ meiotic division in the ___________.
second, father
Nondisjunction can occur at tier the first or second division of meiosis. XXY humans could arise
from nondisjunction at the ___________ meiotic division in the ___________. First, Mother
Second, Mother
,First, Father
Second, Father
Crossing over between homologous chromosomes occurs at which stage of meiosis?
Prophase 1
Humans have 22 pairs of autosomes plus one sex chromosome pair. How many autosomes are
present in a normal human primary spermatocyte? 44
Pre-meiotic germ cells that divide mitotically in females are referred to as ___________.
Oogonia
The cells in which meiosis occurs in males are referred to as ___________. Spermatocytes
A chromosome with two arms of equal length is referred to as ___________; Metacentric
At which stage of meiosis would homologous chromosomes be paired? Prophase of Meiosis
1 OR Metaphase of Meiosis 1
The mitotic stage during which chromosomes being attached to spindle fibers and moving
randomly and reversibly to the centrosomes is ___________. Pro-Metaphase
,If a geneticists were to closely examine the make-up of a single autosomal chromosome from
one of your cells, that chromosome would be found to be ___________. A mosaic of genes
derived from just two of your grandparents - either your maternal grandparents, or your
paternal grandparents.
If you are a male, your X chromosome contain genes derived from ___________. Both your
maternal grandfather and grandmother
The chromosomal structure to which spindle fibers attach during the mitotic divisions is
referred to as ___________. Kinetochore.
Microtubules that attach to centrosomes but not chromosomes and that interdigitate with
microtubules emanating from the centrosome at the opposite pole are known as ___________.
Polar Microtubules
Mitosis results in ___________ in chromosome number while meiosis results in ___________
chromosome number. no change in, a reduction by half in
Cells said to be in the G0 state: Are in an extended G1 phase and no longer cycling.
Cells in G2 state of the cell cycle have ___________ as cells of the same species in the G1 stage.
twice as many chromosomes
, A cross between a white-eyed female fruit fly and a red-eyed male would generate which of the
following types of progeny? Red-eye females and white-eyed males.
A female fruit fly with singled bristles was mated with a male from a true-breeding wild-type
stock with long bristles. All of the F1 females had wild-type bristles and all fo the F1 males had
singled bristles. If the F1 flies are intercrossed, the expected ration of long to single bristles in
the F2 flies is: 1:1 in both sexes
Red-green color blindness is controlled by an X chromosomal gene in humans. A normal man
and women whose fathers are both color-blind marry. What is the probability that their first
child will be color-blind. 1/4
Hemophilia is caused by an X-linked mutation in humans. If a woman whose parental uncle
(father's brother) was a hemophiliac married a man whose brother is also a hemophiliac, what
is the probability of their first child have hemophilia (note: assume no other hemophilia in the
pedigree and no hidden carriers). 0
A white-eyed female fruit fly is mated to a red-eyed male. One of their progeny is a white-eyed
female. What is the likely karyotype of this white-eyed daughter? XXY
A white-eyed female fruit fly is mated to a red-eyed male. One of their progeny is a white-eyed
female. This white-eyed daughter likely arose from nondisjunction of the sex chromosomes
during ___________ in the ___________. Meiosis I or II, Mother
