8th Grade Science Test Review

25 Questions  I  By Monicada on May 21, 2011
This is a practice test designed to help you with your test on Tuesday.

  
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Question Excerpt

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1.  A nucleotide is composed of
A.
B.
C.
D.
2.  A feature that has different forms in a population.
3.  The instructions for an inherited trait.
A.
B.
C.
D.
4.  This is an image of a _________________.
A.
B.
C.
D.
5.  A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What are the genotypes of the parents? R= Round r=wrinkled
6.  Identify the  following: Dd
A.
B.
C.
D.
7.  A trait or allele expressed only when two recessive alleles for the same characteristic are inherited.
8.  DNA is made of subunits called
9.  A genetic disorder caused from an added chromosome to chromosome 21.
A.
B.
C.
10.  An organelle enclosed in a membrane that contains DNA.
A.
B.
C.
D.
11.  GG = gray hair Gg = gray hair gg = white hair BB = black eyes Bb = black eyes bb = red eyes  A male rabbit with the genotype GGbb is crossed with a female rabbit with the genotype ggBb Question: How many out of 16 have white fur and black eyes? ________
12.  The outer boundary of the cell designed to regulate what comes and out of the cell.
A.
B.
C.
13.  The different forms of a gene.
A.
B.
C.
D.
14.  In rabbits, grey hair is dominant to white hair.  Also in rabbits, black eyes are dominant to red eyes. These letters represent the genotypes of the rabbits: GG = gray hair Gg = gray hair gg = white hair BB = black eyes Bb = black eyes bb = red eyes  A male rabbit with the genotype GGbb is crossed with a female rabbit with the genotype ggBb The square is set up below. Fill it out and determine the phenotypes and proportions in the offspring. Question: How many out of 16 have grey fur and black eyes? ________
15.  Scientist which contributed to the discovery of the DNA structure were: James Watson, Francis Crick, and Rosalind Franklin.
A.
B.
16.  The genetic material that determines inherited characteristics.
A.
B.
C.
D.
17.  The passing of traits from parents to offspring.
A.
B.
C.
D.
18.  Rr x rr R= Round r= wrinkled What percentage of the offspring will be round? ___________
A.
B.
C.
D.
19.  The combination of inherited alleles together form an organism’s .
20.  Different forms of a characteristic.
21.  A cross of two traits.
A.
B.
C.
22.  An organism’s appearance is known as its
23.  Identify the following: rr
A.
B.
C.
D.
24.  Used to organize all the possible genotype combinations of offspring from particular parents.
A.
B.
C.
25.  Erwin Chargaff's base pairing rule state that ___________ has an equal proportion to ___________, and ____________ to _____________.
A.
B.
C.
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