biology multiple choice

Project Description:

question 1 (1 point)
what are alleles?question 1 options:
genes for different traits, such as hair color and eye color
alternative forms of a gene for a single trait, such as blue eyes or brown eyes
the locations of genes on a chromosome
recessive forms of a kind of characteristic carried by genes
dominant forms of a kind of characteristic carried by genes

question 2 (1 point)
which is not true according to mendel's law of segregation?question 2 options:
each individual contains two factors for each trait.
one factor must be dominant and one factor recessive in each individual.
factors separate from each other during gamete formation.
each gamete contains one copy of each factor.
fertilization restores the presence of two factors.

question 3 (1 point)
in humans, brown eyes (b) is a simple dominant trait over blue eyes (b). a brown-eyed woman who has a blue-eyed child would have the genotypequestion 3 options:

question 4 (1 point)
in humans, widow's peak (w) is dominant over straight hairline (w). if a heterozygous male marries a female with a straight hairline, what percent of their children can be expected to have widow's peak?question 4 options:
50 %
can't be determined

question 5 (1 point)
what will the genotypic ratio be of a monohybrid cross of two individuals who are heterozygous for a trait?question 5 options:
100% homozygous dominant
100% homozygous recessive
50% homozygous dominant, 50% homozygous recessive
25% homozygous dominant, 50% heterozygous, 25% homozygous recessive
50% homozygous dominant, 50% heterozygous

question 6 (1 point)
in a testcross, an organism with a dominant phenotype, but unknown genotype is crossed with which of the following to establish its genotype?question 6 options:
homozygous dominant
homozygous recessive
heterozygous dominant
monohybrid dominant

question 7 (1 point)
computer simulations are sometimes used to demonstrate the outcome of monohybrid fruit fly crosses, where a student can run generation after generation of fruit flies with 100 offspring produced each generation, half male and half female, and a 3-to-1 phenotype ratio (or 75 to 25) in the f1 generation. compared to real genetics results, which of the following is not true?question 7 options:
rarely would exactly 100 fly offspring be produced or survive.
an exact balance between males and females would be rare.
a precise 3-to-1 ratio would be uncommon.
it is usually possible to have exactly 100 offspring, half male and half female, and a 3-to-1 phenotypic outcome in real life.
ratios and outcomes will not be exact but will be very close to the expected numbers.

question 8 (1 point)
in 1940, two researchers named weiner and landsteiner discovered that about 85 percent of the human population sampled possessed a blood cell protein called the rh factor. the presence of rh factor was labeled rh positive (rh+) and was found to be dominant over the absence of the blood factor (rh-). under normal mendelian inheritance, which of the following statements is/are false?question 8 options:
two rh+ parents could have an rh- child.
two rh- parents could have an rh+ child.
an rh- child would require that both parents be carriers of at least one rh- allele.
it is possible with just one pair of parents to have children where some siblings are rh- and some are rh+.
two rh+ parents can have rh- or rh + children.

question 9 (1 point)
in humans, assume red hair is recessive to dark hair. what are the chances of a dark-haired couple having a red-haired child if each had a red-haired parent?question 9 options:

question 10 (1 point)
if the probability of event a is 3/4 and the probability of event b is 1/4, then the probability of both a and b occurring at the same time isquestion 10 options:
1 or absolute certainty.

question 11 (1 point)
if the genotype of an organism is yysstt, then yst would representquestion 11 options:
the genotype of the offspring.
a possible phenotype of the offspring.
a gamete of the parent.
a possible zygote.
the p generation.

question 12 (1 point)
in which kind of cross would you expect to find a ratio of 9:3:3:1 among the f2 offspring?question 12 options:
monohybrid cross
dihybrid cross
test cross
homozygous recessive x homozygous dominant
homozygous dominant x heterozygous

question 13 (1 point)
in guinea pigs, b = black, b = brown, s = short hair, s = long hair. a dihybrid reproduces with a dihybrid. the expected results arequestion 13 options:
9 black long hair, 3 black short hair, 3 brown long hair, 1 brown short hair.
9 black short hair, 6 black long hair, 3 brown long hair, 1 black short hair.
9 black short hair, 3 black long hair, 3 brown short hair, 1 brown long hair.
9 brown short hair, 3 black long hair, 3 brown long hair, 1 black short hair.
1 black short hair, 1 black long hair, 1 brown short hair, 1 brown long hair.

question 14 (1 point)
in guinea pigs, b = black, b = brown, s = short hair, s = long hair. a hybrid black, shorthaired animal reproduces with a brown, longhaired animal. what is the expected phenotypic ration of the offspring?question 14 options:
1 black short hair, 1 black long hair, 1 brown short hair, 1 brown long hair
3 black short hair, 1 brown long hair, 3 black long hair, 1 brown short hair
9 black short hair, 3 black long hair, 3 brown long hair, 1 brown short hair
9 black short hair, 3 black long hair, 3 brown short hair, 1 brown long hair
9 black short hair, 6 black long hair, 3 brown long hair, 1 brown short hair.

question 15 (1 point)
a cross is made between two parents with genotypes aabb and aabb. if there are 32 offspring, how many of them would be expected to exhibit both dominant characteristics?question 15 options:

question 16 (1 point)
what are the chances that two individuals with wavy hair will have a curly-haired child? curly-hair and straight hair exhibit incomplete dominance.question 16 options:

question 17 (1 point)
if one parent has type b blood and the other has type ab, what type might the child have?question 17 options:
a or o only
b or o only
a or b only
a, b, ab only
a, b, o, or ab

question 18 (1 point)
traits that are controlled by several sets or pairs of alleles, such as skin color and height in humans, are the result of what form of inheritance?question 18 options:
incomplete dominance
multiple allele systems
simple mendelian inheritance

question 19 (1 point)
cold weather can change the ______ of a himalayan rabbit.question 19 options:

question 20 (1 point)
hydrangeas are a flowering plant with large showy blooms. when a plant is grown in aluminum rich soil it has blue flowers; if the same plant is transplanted into soil that is lacking aluminum the flowers produced will be pink. this is an example ofquestion 20 options:
incomplete dominance
environmental effects
polygenetic inheritance

question 21 (1 point)
all of the genes on a single chromosome arequestion 21 options:
a locus
a linkage map
a linkage group

question 22 (1 point)
based on figure: 24.05c, with which genes would you expect to find the highest incidence of linkage?question 22 options:
r and s
r and g
s and g
z and g

question 23 (1 point)
when homologous chromosomes fail to separate during meiosis, this is termedquestion 23 options:
linked genes.

question 24 (1 point)
which statement is true regarding the barr body?question 24 options:
it is found in the nuclei of females.
it is found in the nuclei of males.
it is found in the cytoplasm of males.
it is found in the cytoplasm of females.
it is a condensed inactive y chromosome.

question 25 (1 point)
which statement is not true about down syndrome?question 25 options:
it is caused by a third copy of chromosome 21.
greatly increased incidence occurs with fathers over age 40.
it is usually associated with chromosomal nondisjunction in meiosis.
characteristics include mental retardation and extra eyelid folds.
affected individuals display mental retardation.

question 26 (1 point)
genes on the ___ chromosome determine if the sex of a child will be male or female.question 26 options:

question 27 (1 point)
if an individual has a xyy genotype, they are classified as havingquestion 27 options:
down syndrome.
cri du chat syndrome.
turner syndrome.
klinefelter syndrome.
jacobs syndrome.

question 28 (1 point)
which refers to the loss of a portion of a chromosome?question 28 options:

question 29 (1 point)
the trait diagrammed in figure 24.1 is a(n)question 29 options:
dominant x-linked trait.
recessive x-linked trait.
autosomal recessive trait.
autosomal dominant trait.
dominant y-linked trait.

question 30 (1 point)
using the key in figure 24.1, suppose that the genotype of the first parents was xbxb and xb y. what would be the genotype of individual number 1?question 30 options:

question 31 (1 point)
if a woman is a carrier for the colorblind recessive allele and her husband is normal, what are their chances that a son will be colorblind?question 31 options:
none since the father is normal.
50%, since the mother is only a carrier.
100% because the mother has the gene.
25% because the mother is a hybrid.
none since the son will also be just a carrier.

question 32 (1 point)
a mother is a carrier for blue eyes (autosomal recessive) and for hemophilia (x-linked recessive). which of these is a correct statement?question 32 options:
all sons will have blue ey
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