8th Grade Unit 1 Review Question Preview (ID: 48633)


Review Of Unit 1 8th Grade In AACPS. TEACHERS: click here for quick copy question ID numbers.

What are the X shape structures which contain DNA called?
a) Gene
b) DNA
c) Chromosome
d) Allele

What is the greatest advantage of being a sexual organism?
a) All offspring are genetically different and can survive a new virus, bacteria or environmental change
b) All offspring are genetically identical and can survive a new virus, bacteria or environmental change
c) If one dies they all die
d) All organisms are identical

The Aztecs and Maya Tribes of Mexico where some of the first humans to slowly change wild corn to the corn we know today. What process did these tribes use?
a) Natural Selection
b) Artificial Selection
c) Genetic Engineering
d) Gene Therapy

What is the definition of natural selection?
a) Genes that are chosen by humans such as farmers and ranchers
b) Dogs and Wolves
c) Organisms that are chosen by environmental pressures such as climate, available food, predators and habitat.
d) Genes that are chosen by scientist and academics.

Sources of variations include _______ and ______?
a) sexual reproduction, mutations
b) biological evolution, genetics
c) asexual reproduction, mutations
d) biological evolution, genetics

Which of the following is homozygous recessive?
a) Tt
b) TT
c) tt
d) T

Heterozygous is when...
a) the alleles are the same
b) the alleles are different
c) the alleles are absent
d) the alleles are present

In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a) recessive
b) dominant
c) lower case letter
d) both

The passing of physical characteristics from parent to offspring is called ________.
a) recessive
b) dominant
c) heredity
d) brown eyes

The genetic material of an offspring of sexually reproducing organisms is best described as–
a) identical to that of the other offspring
b) a copy of the genetic material of the father
c) a copy of the genetic material of the mother
d) genes from both parents, in unique combinations

When comparing the offspring of sexually and asexually reproducing organisms, we would expect the genetic material (DNA) of the sexually reproducing organism to -
a) contain fewer mutations
b) be simpler overall
c) be lesser in quantity
d) show more variation

If two organisms reproduce sexually, then their offspring will exhibit a genetic makeup that is -
a) identical to only one parent
b) a unique combination of traits
c) identical to all of its siblings
d) the recessive traits of each parent

How many parents does asexual reproduction involve?
a) One
b) Two
c) Three
d) Four

The offspring from asexually reproduced organisms are?
a) Different than their parents
b) Identical to parents
c) Like a combination from both parents
d) A different species

Scientists insert a human gene for insulin into the DNA of bacteria. This causes the bacteria to produce human insulin. The insulin is used to treat diabetes in humans. This is an example of:
a) Mutation
b) Genetic Engineering
c) Selective Breeding
d) Sexual Reproduction

A scientist cloned a goat. Which of these is a true statement about the goat?
a) It has new genes and traits.
b) It lacks the genes for reproduction.
c) It has genes that are identical to the original goat.
d) It looks the same as the original goat but has different genes.

The colors and scents of plants attract helpful insects and repel insects that feed on them. The production of the proteins that provide these colors and scents is the direct result of
a) behavior learned from parent plants
b) presence of specific genes
c) the genetic makeup of the surrounding vegetation
d) inability of plants to move as animals do

What is one advantage of being an asexual organism?
a) You need a mate to reproduce
b) Only bacteria are asexual
c) You can reproduce at any time without a mate
d) asexual and sexual is the same thing

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