8th Grade Science Test Review

25 Questions  I  By Monicada
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 8th Grade Science Test Review
This is a practice test designed to help you with your test on Tuesday.

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