Download 7th Grade science Genetics Review For each statement, write

7th Grade science
Genetics Review
For each statement, write advantage or disadvantage.
1.
2.
3.
4.
5.
Fewer genetic mutations occur to pass along bad traits. ________________
Many plants are produced, resulting in overcrowding and lack of nutrients. ________________
Dependent on agents of pollination. (Insects, wind, bats, ect.) _________________
Genetic information is shared by the two gametes in sexual reproduction, allowing for more genetic
variation in a species. ___________________
New organisms are genetically identical to their parents so a disease can wipe out the whole species.
_____________
Key: T = tall
t = short
(Height in corn plants)
6.
What is the dominant trait?
7.
What is the recessive trait?
8.
What would be the phenotype of Tt?
9.
What is the genotype of a heterozygous plant?
10. What two genotypes will give a tall plant?
11. What is the genotype of a homozygous tall plant?
12. What is the genotype of a short plant?
13. Create a Punnett square to cross two heterozygous plants. Give the percentage for genotype and
phenotype.
Multiple Choice
14. Which would result in the most diverse offspring?
a. Bees bringing pollen from the flower of one plant to the flower of another
b. An amoeba in a fresh water pond reproducing through binary fission
c. An orchid with a flower structure that forces self-pollination
d. Planting a cutting from a potato to grow a new potato plant
15. Some species of flowers have markings that are only visible to insects with the ability to see ultraviolet
light waves. These markings help the plant
a. Avoid parasitic insects
b. Attract pollen-gathering insects
c. Seek out moisture in the soil
d. Create a strong scent to attract bats
16. Jennifer’s brown and white dog had four puppies. Three of the puppies were solid brown and one
puppy’s coat was brown and white like the mother. Jennifer concluded that
a. Coat color is not a genetic trait
b. Brown is a recessive coat color
c. White is a dominant coat color
d. Brown is a dominant coat color
17. Mice can produce a litter of offspring as often as every 20 days. An elephant can produce one offspring
every two years. Which of the following BEST describes the advantage of having fewer offspring?
a. There are fewer offspring for hungry predators to eat
b. Parents can pay more attention to each offspring
c. Offspring receive only the best traits and adaptations
d. Parents are able to keep more of their genes
18. Students visiting a zoo see a poison dart frog. This bright red frog is about 2 centimeters long. If eats ants
and other small insects. The poison dart from secretes a poisonous chemical from its skin. It lives around
green tropical plants. What is the advantage of this frog having a bright red color in a green
environment?
a. It helps it to hide among plant leaves.
b. It helps it to sneak up on small insects.
c. It serves as a warning to hungry predators.
d. It prevents overheating in a tropical climate.
19. Many plants use brightly colored flowers to attract insect pollinators. Which is the MOST likely conclusion
about a plant that has very small flowers that are hard to see?
a. It contains edible seeds.
b. It does not produce seeds.
c. It only grows in gardens.
d. It is pollinated by the wind.
20. Most organisms have coloration that helps them blend into their surroundings. Male peacocks have
colorful, feathered tails. These conspicuous tails are used for –
a. Building nests
b. Attracting mates
c. Flying and balance
d. Avoiding predators
21. In a particular species of pea plant, yellow seeds are dominant over green seeds. If a plant has green
seeds, it must be –
a. Homozygous for green color
b. Heterozygous for green color
c. Homozygous for yellow color
d. Heterozygous for yellow color
22. African violets are plants that can be grown from leaf cutting. The cuttings form both roots and shoots.
How does the genetic material of the offspring of new plants grown from cutting compare to the genetic
material of the parent plant?
a. Equal in amount and identical
b. Less material then the parent plant
c. More material than the parent plant
d. Equal in amount, but with distinct differences
23. A plant breeder is MOST likely to produce offspring with new combinations of traits by –
a. Cutting one leaf from a plant and placing the leave in moist soil
b. Exchanging grains of pollen between two different colored roses
c. Grafting a branch from an apple tree onto the branch of a pear tree
d. Taking the young plants that grow on the runners of a strawberry plant
24. Which of the following is an advantage of sexual reproduction over asexual reproduction?
a. It produces many individuals quickly.
b. It ensures that all offspring will survive if disease strikes
c. It makes species more able to adapt to environmental changes
d. It passes genetic information from one parent to one offspring
25. In pea plants, tall plants were crossed with short plants, and all of the offspring were tall. The tall parent
plants most likely carry –
a. Two recessive traits
b. Two dominant traits
c. One trait for tallness and one trait for shortness
d. A mutated trait that prevents offspring from being short