8th Grade Science Test Review

25 Questions  I  By Monicada
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.  Erwin Chargaff's base pairing rule state that ___________ has an equal proportion to ___________, and ____________ to _____________.
A.
B.
C.
2.  Identify the  following: Dd
A.
B.
C.
D.
3.  A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What are the genotypes of the parents? R= Round r=wrinkled
4.  A nucleotide is composed of
A.
B.
C.
D.
5.  The genetic material that determines inherited characteristics.
A.
B.
C.
D.
6.  A cross of two traits.
A.
B.
C.
7.  The different forms of a gene.
A.
B.
C.
D.
8.  An organelle enclosed in a membrane that contains DNA.
A.
B.
C.
D.
9.  Scientist which contributed to the discovery of the DNA structure were: James Watson, Francis Crick, and Rosalind Franklin.
A.
B.
10.  DNA is made of subunits called
11.  Used to organize all the possible genotype combinations of offspring from particular parents.
A.
B.
C.
12.  The passing of traits from parents to offspring.
A.
B.
C.
D.
13.  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? ________
14.  This is an image of a _________________.
A.
B.
C.
D.
15.  The outer boundary of the cell designed to regulate what comes and out of the cell.
A.
B.
C.
16.  Different forms of a characteristic.
17.  Identify the following: rr
A.
B.
C.
D.
18.  A trait or allele expressed only when two recessive alleles for the same characteristic are inherited.
19.  An organism’s appearance is known as its
20.  The instructions for an inherited trait.
A.
B.
C.
D.
21.  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? ________
22.  Rr x rr R= Round r= wrinkled What percentage of the offspring will be round? ___________
A.
B.
C.
D.
23.  A feature that has different forms in a population.
24.  A genetic disorder caused from an added chromosome to chromosome 21.
A.
B.
C.
25.  The combination of inherited alleles together form an organism’s .
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