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WorksheetsScience 8 Final Exam REVIEW 3Q
Total questions: 40
Worksheet time: 2hrs 0mins
A _ is a relationship between two different number that is often expressed as a fraction.
Probability
Ratio
Incomplete Dominance
Alleles
Chromosomes that carry the same set of genes is called...
Homologus chromosomes
Sex chromosomes
Y chromosomes
X chromosomes
Deoxyribonucleic acid stands for...
(a)
Adenine always pair with...
Thymine
Cystosine
Uracil
Guanine
Which of these are consequences of mutations?
Improved trait
No change
Can detect errors not quickly
Harmful trait
What is an organism's appearance or chracteristic that is detectable?
genotype
phenotype
genes
alleles
In _, X-rays are aimed at the DNA molecule.
(a)
The two sides of the ladder are made of alternating...
base and sugar parts
phosphate and base parts
sugar and phosphate parts
cytosine and thymine parts
In _, organisms with desirable characteristics are mated.
true-breeding
cross-pollinating
self-pollinating
selective breeding
In asexual reproduction, only _ parent cell(s) is/are needed.
1
2
3
4
Which is true about genes?
One gene can influence multiple traits.
Many genes can influence one trait.
Genes contain a string of nucleotides.
Genes are a set of instructions for an inherited trait.
_ is a diagram that shows the occurence of a genetic trait in several generations of a family.
(a)
DNA is copied every time...
genes divide
a cell divides
a protein divides
a nucleus divides
A tobacco plant that contains firefly genes to glow is an example of _.
(a)
A _ is a diagram used to determine and organize all the possible combinations of offspring from parents.
Punnett square
Pedigree
Alleotype
Probability Chart
The dominant-to-recessive ratio in Mendel's experiment is...
3:1
1:3
4:16
16:4
For sex chromosomes, human males have...
2 X chromosomes
1 Y chromosome and 1 X chromosome
2 Y chromosomes
None
A mirrorlike copy of the DNA segment is called...
transfer RNA (tRNA)
messenger RNA (mRNA)
ribonucleic acid (RNA)
ribosomic RNA (rRNA)
Any physical or chemical agent that can cause a mutation is DNA is called _.
(a)
The rules that say that each base has a equal amount of it to another base is called _.
(a)
Sex cells are also called...
parent cells
sex chromosomes
gametes
genetic cells
When a genotype of ZZ and zz will breed, what is the probability of the offspring?
100% Zz
50% Zz; 50% zz
25% ZZ; 75% zZ
100% ZZ
Bacteria usually reproduce by a type of cell division called...
binary fission
budding
mating
fragmentation
Which of these is a(n) ADVANTAGE(S) of asexual reproduction?
genetic variation
increased survival rate
reproduce a large number of knowledge
reproduce offspring quickly
When a egg is fertilized by a sperm cell, a new cell is formed called a _.
(a)
During replication, a DNA is...
split down the middle
make new amino acids
make new proteins
form new bases
The genes for certain disorders are carried on X chromosomes. These disorders are called...
(a)
_ is a copying process that produces cells with 1/2 the usual number of chromosomes.
(a)
How did Mendel make sure that plants cross-pollinated and not self-pollinate?
He removed the anthers of both plants.
He removed the stigma of 1 plant.
He removed the anthers of 1 plant.
He removed the ovary of bothy plants.
A plant with two dominant or recessive alleles is said to be...
heterozygous
homozygous
homologus
hezozygous
The manipulation of individual genes within organisms is called...
genetic engineering
DNA fingerprinting
clone
insertion
Amino acids...
are joined to make a protein
are building blocks of protein
are contained with nucleotides
are made when DNA splits
T/F. In sexual reproduction, two parents are needed to reproduce a offspring.
True
False
When a cell is ready to divide, it packages the chromatin into...
chromatids
proteins
chromosomes
DNA
The organisms that are newly reproduced by parents or are the young versions of parents are...
first-generation organisms
offspring
animals
babies
For EXAMPLE, when a human egg cell has 24 chromosomes, and a sperm cell has 24 chromosomes, the new cell forms when they combine has...
half the amount combined (24)
numbers combined (48)
eliminated all (0)
twice the amount combined (96)
Dominant alleles are represented by a...
(a)
A _ is an exact copy of another organism's genes in a new organism.
(a)
A mutation that has the base LEFT OUT is called...
(a)
A mutation that has the base IS NOT USED PROPERLY is called...
(a)
