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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. P is reccessive
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
One is homozygous dominant and the other is heterozygous
example of dominant trait
P is dominant
2. Kids heterozygous Ww
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
independent assortment
WW x ww
incomplete dominance
3. Term used to refer to an organism that has two identical alleles for a particular trait BB
homozygous
recessive
heterozygous
alleles
4. 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
P is dominant
homozygous
Bb
5. The appearnce of a recessive trait in offspring of animals most probably indicates that...
recessive
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
independent assortment
Both parents carried at least one recessive gene for that trait
6. 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
heterozygous
recessive
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
7. Different forms of a gene
Both parents carried at least one recessive gene for that trait
segregation
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
alleles
8. 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
Polydactyly
recessive
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
9. 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
pure
recessive
Heterozygous for that trait
10. How many pairs of chromosomes do humans have?
pure
23
dominance
Polydactyly
11. 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
23
independent assortment
Bb
segregation
12. 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
recessive
phenotype
AA x aa
One is homozygous dominant and the other is heterozygous
13. 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
phenotype
alleles
independent assortment
dominance
14. 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
Heterozygous for that trait
Polydactyly
recessive
alleles
15. Different Bb
hetero
P is dominant
25% black - 50% gray - 25% white
segregation
16. Having two like genes
pure
incomplete dominance
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
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?
17. Creates a blended phenotype; one allele is not completely dominant over the other
heterozygous
incomplete dominance
autosomes
AA x aa
18. Explain how organisms can have the same phenotypes and different genotypes.
23
recessive
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
One is homozygous dominant and the other is heterozygous
19. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
hetero
chances a child would be polydactly
Heterozygous for that trait
23
20. An organism's physical appearance - or visible traits
dominance
phenotype
Both parent horses are heterozygous for hair color
One is homozygous dominant and the other is heterozygous
21. 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
autosomes
segregation
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
22. 6 fingers F
alleles
example of dominant trait
autosomes
P is dominant
23. Same BB
dominance
homo
phenotype
AA x aa
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...
25% black - 50% gray - 25% white
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
Both parent horses are heterozygous for hair color
autosomes
25. Dominance B
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?
segregation
example of dominant trait
26. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
segregation
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 mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
WW x ww
27. Threadlike structures made of DNA molecules that contain the genes.
chromosomes
AA x aa
recessive
hetero
28. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
to show dominant trait only need
One is homozygous dominant and the other is heterozygous
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
recessive
29. Chromosomes that do not determine the sex of an individual
autosomes
independent assortment
AA x aa
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
30. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
heterozygous
pure
chromosomes
chances a child would be polydactly
31. 2 organisms may show the same trait - yet have different genotypes for that phenotype
autosomes
One is homozygous dominant and the other is heterozygous
chromosomes
homo
32. One capitol letter W
incomplete dominance
phenotype
chromosomes
to show dominant trait only need
33. Term used to refer to an organism that has two different alleles for the same trait Bb
heterozygous
independent assortment
WW x ww
phenotype