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Test your basic knowledge |
CSET Genetics
Start Test
Study First
Subjects
:
cset
,
science
,
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. One capitol letter W
to show dominant trait only need
Both parents carried at least one recessive gene for that trait
autosomes
AA x aa
2. Term used to refer to an organism that has two identical alleles for a particular trait BB
alleles
WW x ww
homozygous
Both parent horses are heterozygous for hair color
3. 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?
phenotype
WW x ww
Bb
segregation
4. Having two like genes
pure
example of dominant trait
homo
Polydactyly
5. The appearnce of a recessive trait in offspring of animals most probably indicates that...
example of dominant trait
Both parent horses are heterozygous for hair color
25% black - 50% gray - 25% white
Both parents carried at least one recessive gene for that trait
6. 2 organisms may show the same trait - yet have different genotypes for that phenotype
P is dominant
WW x ww
One is homozygous dominant and the other is heterozygous
Both parent horses are heterozygous for hair color
7. Creates a blended phenotype; one allele is not completely dominant over the other
example of dominant trait
autosomes
incomplete dominance
25% black - 50% gray - 25% white
8. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
WW x ww
chances a child would be polydactly
hetero
Heterozygous for that trait
9. How many pairs of chromosomes do humans have?
segregation
23
independent assortment
incomplete dominance
10. 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
chances a child would be polydactly
pure
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...
Heterozygous for that trait
hetero
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
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?
12. Dominance B
pure
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?
One is homozygous dominant and the other is heterozygous
23
13. Term used to refer to an organism that has two different alleles for the same trait Bb
heterozygous
chances a child would be polydactly
homozygous
chromosomes
14. Threadlike structures made of DNA molecules that contain the genes.
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
Bb
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
chromosomes
15. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
Heterozygous for that trait
chromosomes
Polydactyly
16. 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
homo
WW x ww
Bb
independent assortment
17. 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...
chances a child would be polydactly
P is dominant
incomplete dominance
Both parent horses are heterozygous for hair color
18. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
segregation
One is homozygous dominant and the other is heterozygous
recessive
23
19. 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
Polydactyly
chances a child would be polydactly
autosomes
homozygous
20. 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
heterozygous
Polydactyly
dominance
hetero
21. Different forms of a gene
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
alleles
AA x aa
example of dominant trait
22. 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
incomplete dominance
AA x aa
chromosomes
recessive
23. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
segregation
autosomes
independent assortment
24. Kids heterozygous Ww
recessive
homozygous
heterozygous
WW x ww
25. 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?
dominance
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
chromosomes
One is homozygous dominant and the other is heterozygous
26. 6 fingers F
independent assortment
Heterozygous for that trait
example of dominant trait
incomplete dominance
27. 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.
25% black - 50% gray - 25% white
chances a child would be polydactly
Bb
independent assortment
28. An organism's physical appearance - or visible traits
phenotype
incomplete dominance
to show dominant trait only need
23
29. Different Bb
hetero
Both parents carried at least one recessive gene for that trait
chances a child would be polydactly
Both parent horses are heterozygous for hair color
30. Same BB
One is homozygous dominant and the other is heterozygous
homozygous
homo
WW x ww
31. Explain how organisms can have the same phenotypes and different genotypes.
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
heterozygous
P is dominant
Bb
32. P is reccessive
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
P is dominant
AA x aa
Bb
33. Chromosomes that do not determine the sex of an individual
heterozygous
chromosomes
23
autosomes