Unit 6 Review

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Unit 6 Test
Review
1. Look at the chart. It describes the genes
of tomato plants and how the environment
may affect the final appearance. What
gene seems to be influenced by the
environment?
Gene A
2. In lady bugs, a single gene determines
the bug’s markings. The pattern allele is
dominant to the plain allele. A plain lady
bug is crossed with a homozygous
patterned lady bug. What percentage of
the offspring from this cross are expected to
be patterned?
100%
3. Define homozygous.
Carries the same alleles,
2 dominate or 2
recessive
4. Define heterozygous.
Carries different alleles, 1
dominate and 1 recessive.
5. Define genotype
The alleles, or genes, an
organism has
6. Define phenotype.
The physical appearance of
an organism, descriptive
7. What parents most likely
produced the offspring
shown in the punnett square?
Tt and Tt
8. How many chromosomes
do humans have?
46
9. How many chromosomes
do you get from your
mother?
23
10. How many chromosomes
do you get from your father?
23
11. In fruit flies, the gene for eye color is
located on the X chromosome. The red eye
allele (R) is dominant to the white eye allele
(r). A female fly with genotype XRXr is mated
with a male fly with genotype XRY. What
are the possible percentages of the
genotypes of their offspring?
XRXR
XRXr
XRy
Xry
25%
25%
25%
25%
12. Can a person with AB
blood type produce a child
with O blood?
NO
13. A parent with blood type
A and a parent with blood
type B have kids. What are
the possible blood types of
their kids?
A, B, AB, or O
14. X-linked traits are usually
more common in males than
females, why?
Males inherit from their mothers
because they only have one X
chromosome
15. If a mutation occurs on
the DNA, what could occur
with the mRNA and then the
protein that gets produced?
A mutation in the DNA can
cause a mutation in the
mRNA and then a mutation
in the protein.
16. This is a reproductive cell
of a parent. What are the
possible combinations of
alleles this parent could give
to their offspring?
ST, St, sT, st
17. What two things does a
karyotype show?
Gender and chromosome
mutations
18. B=black fur, b=white fur, S=short
hair fur, s=long hair fur. Cross a
parent that is heterozygous for both
traits with a parent that homozygous
recessive for both traits. What
percentages of their offspring would
be white and long fur?
25%
19. Using the gel
electrophoresis picture,
which suspect do you
think committed the
crime?
Suspect C
20. What is DNA Fingerprinting?
DNA fingerprinting is a technique
in which sequences of bases in
DNA unique to an individual
organism are discovered and
then compared to other DNA
sequences from a different
organism of the same species.
21. Why is DNA fingerprinting
used?
Solve crimes, discover who
someone’s relatives are
22. Attached
earlobes is a
recessive trait.
Using the clues
from the key,
determine the
genotype of all
the individuals in
the pedigree in
#22.
Person 1ff, 2Ff, 3F?, 4ff, 5F?,
6F?, 7F?, 8Ff, 9Ff, 10ff, 11ff,
12ff, 13ff, 14ff
23. How many
males in the
pedigree above
have attached
earlobes?
4
24. How many
females in the
pedigree above
have attached
earlobes?
3
25. What does the word haploid
mean?
Half the number of
chromosomes
26. What does the word diploid
mean?
The full or regular amount of
chromosomes
27. What does “2n” and “n” mean?
2n means diploid, n means
haploid
28. In what types of cells does
meiosis occur?
Gametes or reproductive cells
29. What process
is shown in this
picture?
meiosis
30 . What is crossing over?
When the chromosomes
exchange genes
31. When does crossing over
occur?
Prophase 1 of meiosis
32. Why does crossing over
occur?
So the daughter cells
produced are genetically
different, increases variation
33. How are the daughter cells in
mitosis different from the
daughter cells in meiosis?
Mitosis produces 2 genetically
identical daughter cells, Meiosis
produces 4 genetically different
daughter cells
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