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CSET Genetics

Instructions:

Answer 33 questions in 15 minutes.
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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. Creates a blended phenotype; one allele is not completely dominant over the other
chances a child would be polydactly
incomplete 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?
Heterozygous for that trait

2. 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
alleles
recessive
Bb

3. 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
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
heterozygous
AA x aa

4. The appearnce of a recessive trait in offspring of animals most probably indicates that...
to show dominant trait only need
Both parents carried at least one recessive gene for that trait
chances a child would be polydactly
Heterozygous for that trait

5. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
hetero
chances a child would be polydactly
recessive
Both parent horses are heterozygous for hair color

6. Different Bb
P is dominant
independent assortment
example of dominant trait
hetero

7. Term used to refer to an organism that has two identical alleles for a particular trait BB
homozygous
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?
25% black - 50% gray - 25% white

8. Kids heterozygous Ww
segregation
P is dominant
Both parents carried at least one recessive gene for that trait
WW x ww

9. Threadlike structures made of DNA molecules that contain the genes.
AA x aa
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?
alleles
chromosomes

10. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
dominance
Polydactyly
Heterozygous for that trait
to show dominant trait only need

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
P is dominant
independent assortment
chromosomes
Bb

12. Term used to refer to an organism that has two different alleles for the same trait Bb
to show dominant trait only need
heterozygous
chromosomes
Heterozygous for that trait

13. An organism's physical appearance - or visible traits
phenotype
pure
chances a child would be polydactly
23

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
homo
Polydactyly
incomplete dominance
Both parents carried at least one recessive gene for that trait

15. 2 organisms may show the same trait - yet have different genotypes for that phenotype
independent assortment
One is homozygous dominant and the other is heterozygous
Heterozygous for that trait
WW x ww

16. How many pairs of chromosomes do humans have?
23
homozygous
incomplete dominance
Heterozygous for that trait

17. 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 for that trait
dominance
heterozygous
to show dominant trait only need

18. Different forms of a gene
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
alleles
Both parents carried at least one recessive gene for that trait

19. One capitol letter W
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
One is homozygous dominant and the other is heterozygous
recessive
to show dominant trait only need

20. Having two like genes
Bb
dominance
pure
chances a child would be polydactly

21. Explain how organisms can have the same phenotypes and different genotypes.
Both parent horses are heterozygous for hair color
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
AA x aa
alleles

22. 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
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?
heterozygous
25% black - 50% gray - 25% white

23. 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?
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?
Bb
to show dominant trait only need

24. Same BB
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
homo
25% black - 50% gray - 25% white

25. 6 fingers F
to show dominant trait only need
example of dominant trait
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

26. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
phenotype
23
segregation
homozygous

27. 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?
Both parents carried at least one recessive gene for that trait
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
WW x ww
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15

28. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
recessive
homozygous
25% black - 50% gray - 25% white
dominance

29. Dominance B
segregation
homozygous
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

30. P is reccessive
P is dominant
pure
alleles
Both parents carried at least one recessive gene for that trait

31. Chromosomes that do not determine the sex of an individual
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
autosomes
Both parents carried at least one recessive gene for that trait
One is homozygous dominant and the other is heterozygous

32. 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...
WW x ww
segregation
alleles
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

33. 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...
phenotype
dominance
alleles
Both parent horses are heterozygous for hair color