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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. Having two like genes
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
incomplete dominance

2. P is reccessive
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?
P is dominant
autosomes
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

3. 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
heterozygous
WW x ww
One is homozygous dominant and the other is heterozygous
independent assortment

4. Same BB
homo
hetero
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Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15

5. 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...
homo
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Both parent horses are heterozygous for hair color
chances a child would be polydactly

6. Explain how organisms can have the same phenotypes and different genotypes.
homo
AA x aa
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
WW x ww

7. An organism's physical appearance - or visible traits
recessive
Both parents carried at least one recessive gene for that trait
phenotype
homo

8. One capitol letter W
autosomes
hetero
to show dominant trait only need
incomplete dominance

9. 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
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
to show dominant trait only need
P is dominant

10. Kids heterozygous Ww
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?
One is homozygous dominant and the other is heterozygous
chances a child would be polydactly

11. 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
homozygous
homo
P is dominant

12. 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...
hetero
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
Both parents carried at least one recessive gene for that trait
pure

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
dominance
Both parents carried at least one recessive gene for that trait
independent assortment
alleles

14. Different Bb
hetero
example of dominant trait
Bb
incomplete dominance

15. Term used to refer to an organism that has two different alleles for the same trait Bb
heterozygous
hetero
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

16. Creates a blended phenotype; one allele is not completely dominant over the other
Heterozygous for that trait
incomplete dominance
homo
WW x ww

17. 6 fingers F
Both parents carried at least one recessive gene for that trait
example of dominant trait
Both parent horses are heterozygous for hair color
chances a child would be polydactly

18. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
Both parent horses are heterozygous for hair color
homo
recessive
heterozygous

19. Threadlike structures made of DNA molecules that contain the genes.
chromosomes
P is dominant
Polydactyly
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20. 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
AA x aa
Heterozygous for that trait
homo
independent assortment

21. 2 organisms may show the same trait - yet have different genotypes for that phenotype
chromosomes
One is homozygous dominant and the other is heterozygous
dominance
Both parent horses are heterozygous for hair color

22. 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?
homo
Both parent horses are heterozygous for hair color
recessive

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?
autosomes
Bb
WW x ww
phenotype

24. Different forms of a gene
homozygous
Both parent horses are heterozygous for hair color
dominance
alleles

25. The appearnce of a recessive trait in offspring of animals most probably indicates that...
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
dominance
Both parents carried at least one recessive gene for that trait

26. Chromosomes that do not determine the sex of an individual
heterozygous
P is dominant
autosomes
example of dominant trait

27. 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
pure
segregation
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WW x ww

28. Term used to refer to an organism that has two identical alleles for a particular trait BB
homozygous
to show dominant trait only need
alleles
Both parents carried at least one recessive gene for that trait

29. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
segregation
heterozygous
Both parent horses are heterozygous for hair color
autosomes

30. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
heterozygous
recessive
independent assortment
Heterozygous for that trait

31. 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.
WW x ww
example of dominant trait
25% black - 50% gray - 25% white
P is dominant

32. How many pairs of chromosomes do humans have?
chromosomes
heterozygous
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
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33. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
chances a child would be polydactly
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?
Both parents carried at least one recessive gene for that trait
23