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November 19, 2015
Biology I
CSI Worksheet 11 KEY
1. How many unique gametes could be produced through independent assortment by an individual with the
genotype AaBbCCDdEE?
A) 64
B) 16
C) 32
D) 4
E) 8
2. During which phase of meiosis would the cell first become haploid because homologous chromosomes
separate?
A) anaphase I
B) anaphase II
C) telophase II
D) metaphase I
3. Homologous chromosomes _____.
A) carry the same alleles
B) carry information for the same traits
C) align on the metaphase plate in meiosis II
D) are identical
4. Assume that a black guinea pig crossed with an albino guinea pig produced 5 black offspring. When the albino
was crossed with a second black guinea pig, 4 black and 3 albino offspring were produced. What genetic
explanation would apply to these data?
A) albino = dominant; black = incompletely dominant
B) albino and black = codominant
C) albino = recessive; black = recessive
D) albino = recessive; black = dominant
E) None of the answers listed is correct.
Use the following information to answer the questions below.
Two true-breeding stocks of pea plants are crossed. One parent has red, axial flowers and the other has white,
terminal flowers; all F1 individuals have red, axial flowers. The genes for flower color and location assort
independently.
5. 5) If 1,000 F2 offspring resulted from the cross, approximately how many of them would you expect to have red,
terminal flowers?
A) 565
B) 250
C) 750
D) 190
E) 65
6. 6) Among the F2 offspring, what is the probability of plants with white axial flowers?
A) 3/16
B) 9/16
C) 1/4
D) 1/8
E) 1/16
COLORADO SCHOOL OF MINES
Corinne I Core Supplemental Instruction Facilitator | Biology I
Center for Academic Services & Advising
7.
In humans, blue eyes are inherited as a recessive autosomal trait and color blindness is an X-linked recessive
trait. A woman with blue eyes and normal color vision whose father was color blind marries a man who also has
normal color vision. He has brown eyes but his mother had blue eyes. Which of the following do you expect to
be true for their daughters?
A) One-fourth of their daughters will be color blind and have blue eyes, 1/4 of their daughters will be color blind
and have brown eyes, 1/4 of their daughters will have normal color vision and blue eyes, 1/4 of their daughters
will have normal color vision and brown eyes.
B) Their daughters will all have normal color vision and have blue eyes.
C) One-half of their daughters will be color blind and have blue eyes; 1/2 their daughters will be color blind and
have brown eyes.
D) Their daughters will all have normal color vision and brown eyes.
E) One-half of their daughters will have normal color vision and brown eyes; 1/2 of their daughters will have
normal color vision and blue eyes.
8. Independent assortment of chromosomes is a result of
A) The random nature of the fertilization of ova by sperm.
B) The random distribution of the sister chromatids to the two daughter cells during
anaphase II.
C) the random and independent way in which each pair of homologous chromosomes lines up at the metaphase
plate during meiosis I, the random nature of the fertilization of ova by sperm, the random distribution of the
sister chromatids to the two daughter cells during anaphase II, and the relatively small degree of homology
shared by the X and Y chromosomes.
D) the random and independent way in which each pair of homologous chromosomes lines up at the
metaphase plate during meiosis I.
E) the relatively small degree of homology shared by the X and Y chromosomes.
9. The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes awry and
she produces one of her eggs with an extra chromosome (25). The most probable source of this error would be a
mistake in which of the following?
A) telophase II of one meiotic event
B) telophase I of one meiotic event
C) mitosis in her ovary
D) either anaphase I or II
E) metaphase I of one meiotic event
10. Which of the following is true of a species that has a chromosome number of 2n = 16?
A) A gamete from this species has four chromosomes.
B) Each cell has eight homologous pairs.
C) The species has 16 sets of chromosomes per cell.
D) The species is diploid with 32 chromosomes per cell.
E) During the S phase of the cell cycle there will be 32 separate chromosomes.
COLORADO SCHOOL OF MINES
Corinne I Core Supplemental Instruction Facilitator | Biology I