Test your basic knowledge |

CSET Genetics

Instructions:

Answer 33 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Same BB
homo
hetero
Both parents carried at least one recessive gene for that trait
alleles

2. 6 fingers F
Heterozygous for that trait
example of dominant trait
25% black - 50% gray - 25% white
homozygous

3. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
AA x aa
to show dominant trait only need
Heterozygous for that trait
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

4. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
homozygous
Polydactyly
P is dominant
segregation

5. When a mouse with black fur is crossed with a mouse with white fur - all f1 generation offspring have gray fur. Which phenotypic results can be expected in the F2 generation.
Heterozygous for that trait
25% black - 50% gray - 25% white
example of dominant trait
WW x ww

6. If a breeder wanted to discover whether a black guinea pig was homozygous (BB) or heterozygous (Bb) for a coat color - the animal in question would be crossed with an individual of what genotype?
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
WW x ww
chances a child would be polydactly
Bb

7. Term used to refer to an organism that has two identical alleles for a particular trait BB
to show dominant trait only need
Both parent horses are heterozygous for hair color
homozygous
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

8. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
recessive
example of dominant trait
23
WW x ww

9. P is reccessive
P is dominant
autosomes
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
alleles

10. An organism with a dominant allele for a particular form of a trait will always exhibit that form of the trait. (ex. Bb --- The big B would be dominant B
example of dominant trait
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
dominance
One is homozygous dominant and the other is heterozygous

11. In guinea pigs - black coat color is dominant over white coat color. The offspring of a mating between 2 heterozygous black guinea pigs would probably show a genotype ratio of...
Both parent horses are heterozygous for hair color
segregation
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
independent assortment

12. One capitol letter W
AA x aa
recessive
25% black - 50% gray - 25% white
to show dominant trait only need

13. Dominance B
Bb
example of dominant trait
when a strain of fruit flies homozygous for light body color is crossed with a strain of fruit flies homozygous for dark body color - all of the offspring have a light body color. This illustrates the principle of?
chances a child would be polydactly

14. Threadlike structures made of DNA molecules that contain the genes.
example of dominant trait
chromosomes
Both parents carried at least one recessive gene for that trait
incomplete dominance

15. In peas - flowers located along the stem (axial) are dominant to flowers located at the end of the stem (terminal). Let A represent the allele for axial flowers and a represent the allele for terminal flowers. When plants with axial flowers are cross
AA x aa
alleles
when a strain of fruit flies homozygous for light body color is crossed with a strain of fruit flies homozygous for dark body color - all of the offspring have a light body color. This illustrates the principle of?
autosomes

16. A cross between 2 pea plants hybrid for a single trait produces 60 offspring. Approximatley how many of the offspring would be expected to exhibit the recessive trait?
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
P is dominant
when a strain of fruit flies homozygous for light body color is crossed with a strain of fruit flies homozygous for dark body color - all of the offspring have a light body color. This illustrates the principle of?
pure

17. Explain how organisms can have the same phenotypes and different genotypes.
dominance
chances a child would be polydactly
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
example of dominant trait

18. Kids heterozygous Ww
WW x ww
dominance
Bb
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

19. Creates a blended phenotype; one allele is not completely dominant over the other
incomplete dominance
autosomes
hetero
independent assortment

20. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
chances a child would be polydactly
homo
Heterozygous for that trait
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

21. 2 organisms may show the same trait - yet have different genotypes for that phenotype
autosomes
Both parent horses are heterozygous for hair color
One is homozygous dominant and the other is heterozygous
to show dominant trait only need

22. Term used to refer to an organism that has two different alleles for the same trait Bb
heterozygous
autosomes
Bb
hetero

23. States that genes for different traits can segregate independently during the formation of gametes and helps account for the many genetic variations observed in pants - animals - and other organisms
independent assortment
25% black - 50% gray - 25% white
example of dominant trait
Both parents carried at least one recessive gene for that trait

24. In horses - black color is dominant over chestnut color. 2 black horses produce both black and a chestnut colored offspring. If coat color is controlled by a single pair of genes - it can best be assumed that...
Both parents carried at least one recessive gene for that trait
23
example of dominant trait
Both parent horses are heterozygous for hair color

25. Different Bb
AA x aa
pure
hetero
homo

26. An organism's physical appearance - or visible traits
Both parents carried at least one recessive gene for that trait
dominance
phenotype
homozygous

27. How many pairs of chromosomes do humans have?
Polydactyly
recessive
Heterozygous for that trait
23

28. In cabbage butterflies - white color (W) is dominant and yellow color (w) is recessive. If a pure white cabbage butterfly mates with a yellow cabbage butterfly - all the resuting (F1) butterflies are heterozygous white. Which cross represents the gen
25% black - 50% gray - 25% white
chances a child would be polydactly
WW x ww
chromosomes

29. The appearnce of a recessive trait in offspring of animals most probably indicates that...
recessive
to show dominant trait only need
Both parents carried at least one recessive gene for that trait
pure

30. Different forms of a gene
homo
Heterozygous for that trait
autosomes
alleles

31. A characterstic in which a person has 6 fingers per hand. Polydactlyl is dominant over the trait for 5 fingers. If a man who is heterozygous for this trait marries a woman withthe normal number of finger
homo
homozygous
P is dominant
Polydactyly

32. Having two like genes
independent assortment
pure
WW x ww
AA x aa

33. Chromosomes that do not determine the sex of an individual
autosomes
25% black - 50% gray - 25% white
hetero
WW x ww