biology multiple choice (15 questions)

Project Description:

question 1
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
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
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 genotype
question 3 options:

bb.

bb.

bb.

bbb.

bbbb.

question 4
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:

0%

25%

50 %

100%

can't be determined

question 5
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
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

heterozygous

homozygous recessive

heterozygous dominant

monohybrid dominant

question 7
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
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
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:

0

25%

50%

75%

100%

question 10
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 is
question 10 options:

3/4.

1/4.

1 or absolute certainty.

1/2.

3/16.

question 11
if the genotype of an organism is yysstt, then yst would represent
question 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
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
in guinea pigs, b = black, b = brown, s = short hair, s = long hair. a dihybrid reproduces with a dihybrid. the expected results are
question 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
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
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:

32

24

16

8

0
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