Biology 210A
Dr. Hurley
Sample Quiz - Chapters 11 & 14
Multiple Choice
1) What is the difference between a monohybrid cross and a dihybrid cross?
A) A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents.
B) A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny.
C) A monohybrid cross involves organisms that are heterozygous for a single character, whereas a dihybrid cross involves
organisms that are heterozygous for two characters.
D) A monohybrid cross is performed only once, whereas a dihybrid cross is performed twice.
2) Paracrine signaling
A) involves secreting cells acting on nearby target cells by discharging a local regulator into the extracellular fluid.
B) requires nerve cells to release a neurotransmitter into the synapse.
C) occurs only in paracrine yeast cells.
D) has been found in plants but not animals.
3) What is a genetic cross between an individual showing a dominant phenotype (but of unknown genotype) and a
homozygous recessive individual called?
A) a self-cross
C) a hybrid cross
B) a testcross
D) a dihybrid cross
4) Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. This suggests
A) that the parents were true-breeding for contrasting traits.
B) incomplete dominance.
C) that a blending of traits has occurred.
D) that the parents were both heterozygous.
5) A drug designed to inhibit the response of cells to testosterone would almost certainly result in which of the following?
A) lower cytoplasmic levels of cAMP
B) an increase in receptor tyrosine kinase activity
C) a decrease in transcriptional activity of certain genes
D) an increase in cytosolic calcium concentration
6) Given the parents AABBCc x AabbCc, assume simple dominance and independent assortment. What proportion of the
progeny will be expected to phenotypically resemble the first parent?
A) 1/8
C) 3/8
B) 1/4
D) 3/4
E) 1
7) The activation of receptor tyrosine kinases is always characterized by
A) dimerization and phosphorylation.
B) IP3 binding.
C) a phosphorylation cascade.
D) GTP hydrolysis.
8) In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr)
homozygotes. Which of the following crosses would produce offspring in the ratio of
1 red:2 roan:1 white?
A) red x white
C) white x roan
B) red x roan
D) roan x roan
E) The answer cannot be determined from the information provided.
9) At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under
the influence of changing concentrations of estrogens and other steroid hormones. How can one hormone, such as estrogen,
mediate so many effects?
A) Estrogen is produced in very large concentration and therefore diffuses widely.
B) Estrogen has specific receptors inside several cell types, but each cell responds in the same way to its binding.
C) Estrogen is kept away from the surface of any cells not able to bind it at the surface.
D) Estrogen binds to specific receptors inside many kinds of cells, each of which have different responses to its binding.
E) Estrogen can change shape to accomodate different shaped receptors for each of several cell types.
Matching – match the term/phrase from the right with its description/definition on the left; use each letter only once:
10) ____ In a non-allele context, one gene alters the phenotypic expression of another
11) ____ Results in a “blended” phenotype that is in between either phenotype of the parents
12) ____ 2 or more genes affect a single trait
13) ____ One gene influences more than one trait
A. incomplete dominance
B. pleiotropy
C. epistasis
D. polygenic inheritance
14.-16. What is the probability that each of the following pairs of parents will produce the indicated offspring? (Assume
independent assortment of all gene pairs – Be sure to show your work/reasoning for full credit):
_Parent #1 Genotype_
_Parent #2 Genotype_
_Offspring Genotype(s)_
14.
AABbCcDd
15.
AaBbCc
x
AaBbCc

16.
aaBbCC
x
AABbcc

x
AaBbCcDd

AABBCCDd
AaBbCc and aabbcc
AaBbCc or AabbCc
Probability