8th Grade Science Test Review

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