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