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ACP Biology Unit -5 Exam Review (1
ACP Biology Unit -5 Exam Review (1
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ACP Biology Unit #5 Exam ReviewWhich of the following characteristics do homologous chromosomes exhibit? - ANS-They carry
information for the same traits.
Which of the following contributes to genetic variation in sexually reproducing species? -
ANS-Random fertilization, independent assortment, crossing over.
In a human karyotype, chromosomes are arranged in 23 pairs. If we choose one of these pairs,
such as pair 14, which of the following do the two chromosomes of the pair have in common? -
ANS-Length, centromere position, and staining pattern, and traits coded by for their genes.
Somatic cells of roundworms have four individual chromosomes per cell. How many
chromosomes would you expect ti find in an ovum from a roundworm. - ANS-Two.
Which of the following statements is true of a species that has a chromosome number of
2n=16? - ANS-Each diploid cell has eight homologous pairs of chromosomes.
PROBLEM QUESTION:
In humans, freckles are a trait that exhibits simple dominance. The two alleles for this trait are
freckles (A) and no freckles (a). A freckled man whose mother has no freckles marries a woman
with no freckles. What is the probability that their first child will have freckles? Use the Punnett
square to show your work. - ANS-50%- Aa
50%- chance child will have freckles
A.
Sickle cell anemia (SCA) is a human genetic disorder known to be caused by a recessive allele.
A couple plans to marry and wants to know the probability that they will have an affected child.
In the following scenarios, give the families the probabilities having a child with SCA. -
ANS-25%-SS-SCA
B.
The man is affecred by the disorder. The woman has no family history of SCA. - ANS-0%-SCA
A white (w) bird with a heterozygous long beak (L), mates with a homozygous black (W) bird
with a short beak (l). What would the resulting offspring look like? Write the genotype and
phenotype along with the probability of each possible genotype and phenotype. (HINT: this is a
dihybrid cross, determine which gamete combinations are possibilities). - ANS-50%-WwLl-Black
bird with long beak
50%-Wwll-Black bird with short beak
Homozygous for the "B" allele - ANS-I^B I^B
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