WorksheetsLCHS Unit 7 Review Biology
Total questions: 26
Worksheet time: 14mins
A recessive trait
is always a white flower.
is always expressed.
is never expressed.
is only expressed when there is no dominant allele.
What will the chromosomes look like after crossing over above?
Segregation (separation) in meiosis will result in
genetically identical cells.
gametes(N) with half the number of chromosomes that somatic cells have.
cancer cells.
a zygote.
A human has 46 chromosomes in its somatic cells. Gametes (sex) cells are different from the somatic (body) cells because they have
24 chromosomes.
22 chromosomes.
23 chromosomes.
92 chromosomes.
A diploid cell is
(N) half the number of chromosomes.
(2N) two full sets of chromosomes.
same as haploid cells.
All the answers.
Which of the following is characteristic of a dominant trait?
lowercase letters only
uppercase letters only
a trait that is expressed in the phenotype only when an organism has two dominant alleles
a trait that is expressed in the phenotype when an organism has at least one dominant allele
Where does telophase occur?
Transcription
Mitosis
Translation
S phase
What process is this and what type of cells does this produce?
Mitosis, gamete cells
Meiosis, somatic cells
Mitosis, somatic cells
Meiosis, gamete cells
The genotype expressed as its physical trait is called
phenotype.
mutation.
chromosomes.
genotype.
Why does sexual reproduction bring about greater genetic diversity than asexual reproduction?
New combinations of genes result from sexual reproduction.
Only mitosis has to occur in sexual reproduction.
Asexual reproduction results in increased genetic variation.
Binary fission occurs too slow for genetic variation.
Two alleles that are identical are called
dominant
homozygous
heterozygous
recessive
What will be the phenotypic ratio for the offspring?
RR: 50% Rr: 50%
Rounded seeds: 50% Wrinkled seeds: 50%
Rounded seeds: 100% Wrinkled seeds: 0%
RR: 100% Rr: 0%
A segment of DNA on a chromosome which codes for a particular trait is a/an
gene.
allele.
macromolecule
DNA
A person can have a widow's peak (above) or a straight hairline. The allele for widow's peak W, is dominant over the allele for straight hairline w. If a person is heterozygous for this gene, what are the possible alleles he has to pass on to his gametes?
W or w
W only
w only
none of these
Cross a tall flower (Tt) with a short flower (pp). What percentage of the offspring will have tall flowers (TT or Tt)?
0%
25%
50%
75%
A body cell is called
sex cells.
haploids.
somatic cells.
gametic.
Codominance
has one allele dominant over the other.
blends the two alleles.
has both alleles expressed at the same time.
has both recessive alleles.
What are all the possibilities of the offsprings' blood types?
A
AB
A, B, O
A, B, AB
Choose a recessive phenotype's genotype.
Ff
fF
FF
ff
What is the genotype for a long, smooth, yellow, grooved seed?
llwwYYrr
LlwwYyRr
LlwwYyrr
LlWWYYRR
Crossing over leads to increase of
your grade.
mitosis.
genetic variation.
haploids.
If a heterozygous black sheep is crossed with a white sheep, what are the genotypic ratios expected?
1 homozygous dominant : 2 heterozygous : 1 homozygous recessive
0 homozygous dominant : 3 heterozygous : 1 homozygous recessive
1 homozygous dominant : 3 heterozygous : 1 homozygous recessive
0 homozygous dominant : 2 heterozygous : 2 homozygous recessive
Which correctly lists the level of organization from most simple to most complex?
organ system, organism, organ, tissue, cell
organ, cell, molecule, Ms. Lee's dog
cell, tissue organ, organ system, organism
cell, organ, tissue, organism, Ms. Lee's dog
Is this karyotype a male or female?
male
female
Which best explains the difference between muscle cells and nerve cells?
Different genes are expressed in muscle cells than in blood cells.
IDK (don't pick this one -_-)
Muscle cells are produced by the brain, the nerve cells are produced by the heart.
Which is the correct combination of alleles to set up TtPp on the dihybrid chart?
Tt, Pp, Tp, TP
TP, Pp, tP, tp
TP, Tp, tP, tp
pt, tP, tt, pp
