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