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. Term used to refer to an organism that has two identical alleles for a particular trait BB
chances a child would be polydactly
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
homozygous
25% black - 50% gray - 25% white

2. 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
dominance
Heterozygous for that trait
P is dominant
23

3. An organism's physical appearance - or visible traits
Both parents carried at least one recessive gene for that trait
incomplete dominance
chances a child would be polydactly
phenotype

4. Creates a blended phenotype; one allele is not completely dominant over the other
Polydactyly
WW x ww
incomplete dominance
25% black - 50% gray - 25% white

5. 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
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
Polydactyly
One is homozygous dominant and the other is heterozygous
autosomes

6. Different Bb
AA x aa
hetero
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?
P is dominant

7. 6 fingers F
chromosomes
example of dominant trait
One is homozygous dominant and the other is heterozygous
hetero

8. 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?
Polydactyly
incomplete dominance
recessive
Bb

9. Threadlike structures made of DNA molecules that contain the genes.
chromosomes
Polydactyly
pure
independent assortment

10. 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...
Polydactyly
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
Both parents carried at least one recessive gene for that trait
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

11. Explain how organisms can have the same phenotypes and different genotypes.
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
heterozygous
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
25% black - 50% gray - 25% white

12. Having two like genes
WW x ww
Polydactyly
pure
chromosomes

13. 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...
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
Bb
Both parent horses are heterozygous for hair color
Heterozygous for that trait

14. Term used to refer to an organism that has two different alleles for the same trait Bb
independent assortment
homozygous
One is homozygous dominant and the other is heterozygous
heterozygous

15. Chromosomes that do not determine the sex of an individual
autosomes
heterozygous
25% black - 50% gray - 25% white
23

16. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
Heterozygous for that trait
Bb
chances a child would be polydactly
recessive

17. Kids heterozygous Ww
example of dominant trait
phenotype
chances a child would be polydactly
WW x ww

18. Dominance B
independent assortment
23
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

19. 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
alleles
Heterozygous for that trait
autosomes
AA x aa

20. 2 organisms may show the same trait - yet have different genotypes for that phenotype
One is homozygous dominant and the other is heterozygous
chromosomes
recessive
alleles

21. The appearnce of a recessive trait in offspring of animals most probably indicates that...
23
One is homozygous dominant and the other is heterozygous
example of dominant trait
Both parents carried at least one recessive gene for that trait

22. Different forms of a gene
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
alleles
Both parent horses are heterozygous for hair color
to show dominant trait only need

23. One capitol letter W
to show dominant trait only need
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
Heterozygous for that trait
Both parent horses are heterozygous for hair color

24. 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?
heterozygous
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
autosomes
recessive

25. P is reccessive
incomplete dominance
recessive
dominance
P is dominant

26. Same BB
segregation
Bb
Polydactyly
homo

27. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
Both parent horses are heterozygous for hair color
segregation
25% black - 50% gray - 25% white
recessive

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
WW x ww
heterozygous
segregation
chromosomes

29. 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.
alleles
dominance
25% black - 50% gray - 25% white
P is dominant

30. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
P is dominant
chromosomes
Heterozygous for that trait
recessive

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

32. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
Heterozygous for that trait
segregation
One is homozygous dominant and the other is heterozygous
hetero

33. 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
AA x aa
chances a child would be polydactly
independent assortment
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?