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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. Kids heterozygous Ww
WW x ww
segregation
25% black - 50% gray - 25% white
23

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

3. An organism's physical appearance - or visible traits
chromosomes
dominance
phenotype
Heterozygous for that trait

4. 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
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?
to show dominant trait only need
23
independent assortment

5. 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
example of dominant trait
chances a child would be polydactly
autosomes

6. Different Bb
Both parent horses are heterozygous for hair color
segregation
hetero
AA x aa

7. Creates a blended phenotype; one allele is not completely dominant over the other
heterozygous
incomplete dominance
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
segregation

8. Term used to refer to an organism that has two different alleles for the same trait Bb
Bb
hetero
recessive
heterozygous

9. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
25% black - 50% gray - 25% white
hetero
Heterozygous for that trait
WW x ww

10. Having two like genes
example of dominant trait
pure
chances a child would be polydactly
homo

11. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
chances a child would be polydactly
example of dominant trait
25% black - 50% gray - 25% white
Bb

12. 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
to show dominant trait only need
Polydactyly
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
homozygous

13. Term used to refer to an organism that has two identical alleles for a particular trait BB
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autosomes
homozygous
alleles

14. 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
incomplete dominance
homo

15. 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
One is homozygous dominant and the other is heterozygous
incomplete dominance
Both parent horses are heterozygous for hair color

16. 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?
chances a child would be polydactly
to show dominant trait only need
phenotype
Bb

17. Different forms of a gene
23
One is homozygous dominant and the other is heterozygous
alleles
Both parent horses are heterozygous for hair color

18. P is reccessive
incomplete dominance
pure
P is dominant
WW x ww

19. One capitol letter W
WW x ww
to show dominant trait only need
segregation
independent assortment

20. 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...
pure
Both parent horses are heterozygous for hair color
segregation
chances a child would be polydactly

21. 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
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 parent horses are heterozygous for hair color
chromosomes

22. 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.
dominance
25% black - 50% gray - 25% white
to show dominant trait only need
AA x aa

23. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
homozygous
One is homozygous dominant and the other is heterozygous
Polydactyly
segregation

24. How many pairs of chromosomes do humans have?
pure
segregation
23
chances a child would be polydactly

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

26. Same BB
hetero
phenotype
WW x ww
homo

27. 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
pure
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
homozygous

28. 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
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
WW x ww
chances a child would be polydactly

29. Dominance B
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?
Heterozygous for that trait
chromosomes

30. 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
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?
dominance
Both parent horses are heterozygous for hair color
chances a child would be polydactly

31. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
hetero
recessive
Both parents carried at least one recessive gene for that trait
WW x ww

32. 6 fingers F
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
25% black - 50% gray - 25% white
P is dominant
example of dominant trait

33. Chromosomes that do not determine the sex of an individual
chromosomes
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homozygous
autosomes