Download Name: ________ Date: _________ Period: ____ Intermediate

Name: _________________________________ Date: ______________ Period: ____
Intermediate Science
Mr. Vorstadt
Heredity Open Book Test
Part 1
______ 1- A section of DNA that controls a specific trait is called?
(1) atom
(2) molecule (3) chromosome (4) gene
______ 2- Human sex cells or Gametes are
(1) large (2) triploid
(3) monoploid
(4) diploid
______ 3- When a red snapdragon is crossed with a white snapdragon the
offspring are
(1) pink
(2) red (3) white (4) yellow
______ 4- Mendel crossed a homozygous tall pea plant with a homozygous short
pea plant and the result was that the offspring were
(1) B all short (2) height all medium
(3) all tall (4) they all died.
______ 5- Human body cells normally have how many chromosomes?
(1) 24
(2) 46
(3) 96
(4) 36
______ 6- A human egg cell contains
(1) only one Y chromosome..
(3) two X chromosomes..
(2) only one X chromosome.
(4) one X & one Y chromosome
______ 7- An organism with two of the same alleles of a certain gene
(1) heterozygous (2) a homozygous
(3) genotype
(4) the phenotype
______ 8- The form of a trait that prevents the expression of its companion in a pair is
An (a)
(1) hybrid
(2) recessive
(3) dominant (4) allele
______ 9- The science that explains the similarities and differences among parent and
their offspring
(1) evolution
(2) genetics
(3) physiology
(4) anatomy.
______ 10- If twins are a boy and a girl, you know they are
(1) carrying the same genes
(2) fraternal
(3) the result of crossing over (4) identical
______ 11- Color-blindness is
(1) dominant.
(3) most common in women.
______ 12- Down syndrome is caused by
(1) an extra chromosome.
(3) a broken chromosome
(2) recessive.
(4) Y-linked.
(2) the loss of a chromosome.
(4). all of the above are correct.
1
Use the diagram to answer question 13-17 write the correct answer (s) on the line.
A
Two fetuses
B
Two fetuses
13- Diagram _______________ represents the development of fraternal twins.
14- The twins in diagram _______________ have the same genotype.
15- Diagram _______________ represents the development of identical twins.
16- The twins that develop in diagram _______________ cannot be different sexes.
17- In diagram __________ one twin can be male and the other twin can be female.
Part 2
Column 1
______ 18- Organisms that have two different
alleles of gene pair.
______ 19- Type of allele that is hidden in a hybrid.
______ 20- Genetic makeup of an organism.
______ 21- Organisms that have two of the same
alleles of gene pair.
______ 22- Physical appearance of an organism.
______ 23- Process that produces sex cells in humans.
______ 24-Type of allele that is visible in a hybrid.
______ 25- Cells with two sets of chromosomes.
______ 26- Also known as cell division.
______ 27- The exchange of DNA during meiosis.
______ 28- Study of similarities and difference
among parent an offspring
Column 2
A- Genetics
B- Incomplete Dominance
C- Meiosis
D- Phenotype
E- Monoploid
F- Mitosis
G- Dominant
H- Homozygous
I- Diploid
J- Heterozygous
K- Recessive
L- Crossing Over
M- Genotype
______ 29- Cells with only one set of chromosomes.
______ 30- Condition in which two different alleles in a gene pair blend together.
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Part 3
31-33 Use the P-square below and cross a hybrid female (Rr) with a pure recessive
male pea plants (rr). (wrinkled (R) is dominant)
%Phenotype
%Genotype
_______ wrinkle
_______ homozygous
_______ smooth
_______ heterozygous
34-36 Use the P-square below to cross two guinea pigs one pure White haired bb and
one hybrid black haired Bb. (Black (B) is dominant)
%Phenotype
%Genotype
_______ Black
_______ homozygous
_______ White
_______ heterozygous
37-39 Use the P-square below to cross hybrid pink (WR) snapdragon with a pure Red
(RR) snapdragon plant
%Phenotype
%Genotype
_______ Red (RR)
_______ Homozygous
_______ White (WW)
_______ Heterozygous
_______ Pink (WR)
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Part 4
Pedigree Chart for Colorblindness
40. The pedigree chart above shows a family’s pedigree for colorblindness. Which sex
can be carriers of colorblindness and not have it? ______________________
41. With this in mind, what kind of trait is colorblindness (use your notes)?
___________________________________________________________________
42. Why does individual IV-7 have colorblindness?_____________________________
__________________________________________________________________
43. What two IV generation numbers represent colorblind males. __________________
44. What does it mean when a line connects two symbols horizontally?_____________
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45-46 Cross a carrier (heterozygous) XBXb woman with normal vision with a colorblind
man XbY.
Legend
XBXB –normal girl
XBXb – normal (carrier) girl
XbXb - colorblind girl
B
Parents
Cross it
Genotype
XBXb
x
X bY
X Y - normal boy
XbY - colorblind boy
47-48 Bill and Bertha want to know if they have a chance at passing on colorblindness
to their kids. Bill and Bertha are not colorblind. However, Bertha’s father was
colorblind (she’s a carrier).
Legend
XBXB –normal girl
X X – normal (carrier) girl
B
Parents
Cross it
Genotype
XBXb
b
XbXb - colorblind girl
B
x
XBY
X Y - normal boy
XbY - colorblind boy
49 & 50- Who is the father of Genetics? ____________________________________
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