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