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CSET Genetics

Instructions:

Answer 33 questions in 15 minutes.
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Match each statement with the correct term.
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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. 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
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
homozygous
phenotype

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

3. Same BB
homo
phenotype
incomplete dominance
dominance

4. Different forms of a gene
segregation
alleles
incomplete dominance
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15

5. 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
WW x ww
Heterozygous for that trait
Polydactyly
AA x aa

6. Different Bb
hetero
independent assortment
homo
Bb

7. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
23
recessive
heterozygous
hetero

8. 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
pure
Heterozygous for that trait
Both parent horses are heterozygous for hair color

9. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
homo
AA x aa
WW x ww
segregation

10. 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?
chromosomes
autosomes
recessive

11. Term used to refer to an organism that has two identical alleles for a particular trait BB
P is dominant
homozygous
Both parent horses are heterozygous for hair color
Heterozygous for that trait

12. Chromosomes that do not determine the sex of an individual
to show dominant trait only need
autosomes
incomplete dominance
AA x aa

13. P is reccessive
dominance
Both parents carried at least one recessive gene for that trait
P is dominant
WW x ww

14. 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
recessive
pure
One is homozygous dominant and the other is heterozygous
WW x ww

15. 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
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
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?

16. 6 fingers F
23
Both parent horses are heterozygous for hair color
WW x ww
example of dominant trait

17. 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.
One is homozygous dominant and the other is heterozygous
Bb
25% black - 50% gray - 25% white
autosomes

18. 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
heterozygous
Polydactyly
23

19. 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
recessive
segregation
WW x ww
dominance

20. 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?
example of dominant trait
Bb
hetero
phenotype

21. 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?
chromosomes
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
example of dominant trait
Both parent horses are heterozygous for hair color

22. An organism's physical appearance - or visible traits
chances a child would be polydactly
phenotype
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?
independent assortment

23. How many pairs of chromosomes do humans have?
23
recessive
chromosomes
WW x ww

24. One capitol letter W
to show dominant trait only need
P is dominant
25% black - 50% gray - 25% white
AA x aa

25. 2 organisms may show the same trait - yet have different genotypes for that phenotype
alleles
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
One is homozygous dominant and the other is heterozygous
Both parent horses are heterozygous for hair color

26. Kids heterozygous Ww
P is dominant
WW x ww
heterozygous
chromosomes

27. Threadlike structures made of DNA molecules that contain the genes.
pure
Bb
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?

28. 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...
segregation
phenotype
heterozygous
Both parent horses are heterozygous for hair color

29. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
to show dominant trait only need
P is dominant
chances a child would be polydactly
recessive

30. Creates a blended phenotype; one allele is not completely dominant over the other
chances a child would be polydactly
heterozygous
recessive
incomplete dominance

31. 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
independent assortment
homo
segregation
pure

32. Explain how organisms can have the same phenotypes and different genotypes.
to show dominant trait only need
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
chances a child would be polydactly
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

33. Having two like genes
pure
hetero
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?