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. Having two like genes
Polydactyly
pure
Both parent horses are heterozygous for hair color
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?

2. 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
homo
AA x aa
Both parents carried at least one recessive gene for that trait
Polydactyly

3. Term used to refer to an organism that has two identical alleles for a particular trait BB
One is homozygous dominant and the other is heterozygous
Both parent horses are heterozygous for hair color
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
homozygous

4. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
chromosomes
recessive
P is dominant
chances a child would be polydactly

5. 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...
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
pure
Both parent horses are heterozygous for hair color
alleles

6. How many pairs of chromosomes do humans have?
23
AA x aa
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
heterozygous

7. 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.
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
AA x aa
alleles
25% black - 50% gray - 25% white

8. Kids heterozygous Ww
AA x aa
segregation
independent assortment
WW x ww

9. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
25% black - 50% gray - 25% white
to show dominant trait only need
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?
recessive

10. 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?
homozygous
phenotype
Bb
to show dominant trait only need

11. 6 fingers F
AA x aa
homozygous
example of dominant trait
23

12. Term used to refer to an organism that has two different alleles for the same trait Bb
One is homozygous dominant and the other is heterozygous
chances a child would be polydactly
heterozygous
alleles

13. Explain how organisms can have the same phenotypes and different genotypes.
chances a child would be polydactly
WW x ww
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
Both parent horses are heterozygous for hair color

14. Different Bb
hetero
autosomes
Both parent horses are heterozygous for hair color
homo

15. Different forms of a gene
recessive
example of dominant trait
chromosomes
alleles

16. 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
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
homo
recessive
WW x ww

17. Threadlike structures made of DNA molecules that contain the genes.
chromosomes
Both parent horses are heterozygous for hair color
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?
WW x ww

18. Creates a blended phenotype; one allele is not completely dominant over the other
Both parent horses are heterozygous for hair color
incomplete dominance
phenotype
chances a child would be polydactly

19. 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?
One is homozygous dominant and the other is heterozygous
P is dominant
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
AA x aa

20. Dominance B
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?
hetero
P is dominant
phenotype

21. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
segregation
chromosomes
to show dominant trait only need
recessive

22. 2 organisms may show the same trait - yet have different genotypes for that phenotype
Heterozygous for that trait
WW x ww
One is homozygous dominant and the other is heterozygous
chromosomes

23. Same BB
WW x ww
WW x ww
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
homo

24. 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
homozygous
incomplete dominance
WW x ww

25. 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
Both parent horses are heterozygous for hair color
alleles
segregation
independent assortment

26. Chromosomes that do not determine the sex of an individual
autosomes
pure
hetero
WW x ww

27. One capitol letter W
pure
to show dominant trait only need
One is homozygous dominant and the other is heterozygous
dominance

28. An organism's physical appearance - or visible traits
One is homozygous dominant and the other is heterozygous
chromosomes
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?
phenotype

29. 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...
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
recessive
Bb

30. P is reccessive
Heterozygous for that trait
Both parent horses are heterozygous for hair color
P is dominant
One is homozygous dominant and the other is heterozygous

31. 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
incomplete dominance
recessive
dominance
autosomes

32. 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
alleles
Polydactyly
Heterozygous for that trait
autosomes

33. The appearnce of a recessive trait in offspring of animals most probably indicates that...
Both parents carried at least one recessive gene for that trait
Polydactyly
homozygous
25% black - 50% gray - 25% white