Download Name: Date: Bell: Reviewing Concepts Multiple Choice Choose the

Name:
Date:
Bell:
Reviewing Concepts
Multiple Choice
Choose the letter of the best answer.
1. Which of the following states that heritable factors (genes) retain their identity generation after
generation?
a. blending hypothesis of inheritance
b. principle of independent assortment
c. principle of segregation
d. particulate hypothesis of inheritance
2. Which term describes an individual with two identical alleles for aparticular character?
a. homozygous
b. heterozygous
c. dominant
d. recessive
3. If you want to know the genotype of a pea plant that has purple flowers, which would you
perform?
a. dihybrid cross
b. genetic linkage
c. Punnett square
d. testcross
4. What is the predicted phenotypic ratio of the F2 generation of a dihybrid cross?
a. 1 : 3 : 1
b. 3 : 9 : 1 : 1
c. 1 : 9 : 9 : 1
d. 9 : 3 : 3 : 1
5. AB blood type in humans is a result of
a. intermediate inheritance.
b. codominance.
c. sex-linked inheritance.
d. environmental effects.
6. The farther apart the alleles for two genes are on the same chromosome, the more likely they
are to
a. separate during meiosis.
b. stay together during meiosis.
c. be inherited only by male offspring.
d. both be recessive.
7. How many alleles for a sex-linked (X-linked) gene does a male carry?
a. four
b. one
c. none
d. two
Short Answer
9. Suppose you have two fully grown pea plants, one tall and one dwarf. Dwarf height is a
recessive trait. Using T and t as the alleles, what is the dwarf plant's genotype? How could you
learn the tall plant's genotype?
Traits of 2 parents blend. Did not not explain how traits could disappear in F1 generation and
reappear in the F2 generation
10. List the possible combinations of alleles in the gametes of an individual with genotype AaBb.
AB, Ab, aB, ab
11. Explain Mendel's principle of independent assortment. When might this principle not apply?
2 or more traits appearing on 2 different chromosomes will sort themselves independently of one
another. This would not apply when 2 genes appear on the same chromosome.
12. If a father's blood type is B and a mother's blood type is A, is it possible that their child could
have blood type O? Explain your response.
Yes…Cross IBIi with IAIi
13. Define polygenic inheritance and give an example of a character that is polygenic.
Trait that is affected by 2 or more genes. Ex: Height, IQ, Hair color
14. Explain how a white-eyed male fruit fly can have a red-eyed father.
Eye color is sex-linked. If the gene is found on the X chromosome, this gene is given to a male
fly by his mother.
Visualizing Concepts
15. The Punnett square below represents the self-fertilization of a pea plant that is heterozygous
for yellow peas. Copy the diagram and fill in the missing alleles to predict the resulting offspring.
a. What fraction of the offspring are predicted to have yellow peas? Green peas?
b. What is the predicted phenotypic ratio of the offspring? The predicted genotypic ratio?
A.
B.
¾, 1/4
3:1, 1:2:1
16. Draw a Punnett square to show how the 1 : 2 : 1 ratio of black : blue : white chickens is
predicted for the F2 offspring shown in Figure 10-9.
See me in class if not certain.
Applying Concepts
Analyzing Information
17. Analyzing Data The table below shows the results of a cross of two red-eyed fruit flies.
Some of the offspring have "ruby"-colored (deep pink) eyes instead of the usual red-colored eyes.
a. Are ruby-colored eyes dominant or recessive? Recessive
b. How do the results of the cross indicate that ruby eye color is sex-linked?
Ruby only
shows up in male flies.
c. Using XR for the dominant allele and Xr for the recessive allele, write the genotypes of the two
parents.
XRXr, XRY
d. Do the female offspring all have the same genotype? List the likely genotype(s) of the female
offspring.
No. Half are XRXR and half are XRXr
e. List the genotype of the red-eyed males and the genotype of the ruby-eyed males.
XRY = Red
XrY = Ruby
18. Analyzing Diagrams The diagram shows three gene loci on a pair of homologous
chromosomes.
a. Of the three genes found on this pair of homologous chromosomes, which two are most likely
to be separated from each other by a crossover event? Explain. D and B are farther apart than any
other genes. The farther apart 2 genes are the more likely they are to be separated by a crossing
over event.
b. If no crossovers occurred between any of the genes, list the possible combinations of alleles in
this individual's gametes.
A. D and B (or d and b)
B. DaB and dAb
Critical Thinking
19. Evaluating Models Explain how the table of outcomes for the pennies presented in Concept
10.2 helps explain the outcome of a cross of two F1 offspring. What do the two sides represent?
Sides of a penny represent alleles of a gene.
Each penny is like a Heterozygous organism.
20. Problem Solving Tim and Christine have freckles (a dominant trait that is not sex-linked),
but their son Michael does not. Show with a Punnett square how this is possible.
See me in class.
Tim and Christine are expecting a baby. What is the probability of freckles in that child?
75% with freckles
21. Analyzing Scientific Explanations Suppose a friend in biology class says: "There are just
two alleles for every gene." Another of your friends says: "There are many alleles for some
genes." In what way are they both correct? Explain.
Individuals are diploid (2 copies of each gene or 2 alleles)
Populations may have more than 2 types of alleles (ie: blood types)
22. What's Wrong With These Statements?
Briefly explain why each statement is inaccurate or misleading.
a. If the first time you flip a penny you see a tail, the next flip is more likely to show a head.
50/50 every time.
b. If you buy two plants of the same species that have different-colored flowers, they must have
different genotypes.
Environment could play a role…genotypes may be the same but phenotype may be
affected by temp., pH, etc.
REVIEW TONIGHT:
1.
Monohybrid crosses
2.
Dihybrid crosses
3.
Intermediate inheritance = incomplete dominance
4.
Sex-linked traits
5.
Blood types
6.
Mitosis
7.
Meiosis