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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. Creates a blended phenotype; one allele is not completely dominant over the other
incomplete dominance
Polydactyly
hetero
WW x ww

2. Threadlike structures made of DNA molecules that contain the genes.
heterozygous
chromosomes
independent assortment
Both parent horses are heterozygous for hair color

3. 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
homo
pure
AA x aa

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
chances a child would be polydactly
Heterozygous for that trait
chromosomes
independent assortment

5. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
chromosomes
recessive
segregation
autosomes

6. 2 organisms may show the same trait - yet have different genotypes for that phenotype
homo
One is homozygous dominant and the other is heterozygous
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

7. P is reccessive
alleles
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
P is dominant

8. 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
WW x ww
Polydactyly
P is dominant
chromosomes

9. Different forms of a gene
phenotype
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
alleles
to show dominant trait only need

10. How many pairs of chromosomes do humans have?
23
heterozygous
dominance
hetero

11. The appearnce of a recessive trait in offspring of animals most probably indicates that...
incomplete dominance
Both parent horses are heterozygous for hair color
Both parents carried at least one recessive gene for that trait
WW x ww

12. 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
Both parents carried at least one recessive gene for that trait
dominance
hetero

13. Chromosomes that do not determine the sex of an individual
P is dominant
incomplete dominance
WW x ww
autosomes

14. 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
chances a child would be polydactly
chromosomes
AA x aa
WW x ww

15. Different Bb
Bb
Heterozygous for that trait
hetero
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. Same BB
homo
homozygous
AA x aa
independent assortment

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.
25% black - 50% gray - 25% white
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
Heterozygous for that trait
WW x ww

18. 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?
Polydactyly
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
to show dominant trait only need
hetero

19. Term used to refer to an organism that has two identical alleles for a particular trait BB
homozygous
recessive
AA x aa
23

20. 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 for that trait
23
homo
Both parent horses are heterozygous for hair color

21. Kids heterozygous Ww
pure
WW x ww
chromosomes
23

22. 6 fingers F
example of dominant trait
Both parent horses are heterozygous for hair color
Polydactyly
chromosomes

23. 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...
pure
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
heterozygous
25% black - 50% gray - 25% white

24. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
One is homozygous dominant and the other is heterozygous
chances a child would be polydactly
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

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

26. Term used to refer to an organism that has two different alleles for the same trait Bb
dominance
phenotype
heterozygous
alleles

27. 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?
recessive
hetero
Bb
heterozygous

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...
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
Polydactyly

29. Having two like genes
25% black - 50% gray - 25% white
independent assortment
pure
phenotype

30. An organism's physical appearance - or visible traits
phenotype
chances a child would be polydactly
hetero
Polydactyly

31. 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?
WW x ww
Both parent horses are heterozygous for hair color
homozygous

32. 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
Both parents carried at least one recessive gene for that trait
alleles
WW x ww
dominance

33. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
WW x ww
segregation
recessive
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?