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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 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
example of dominant trait
Both parents carried at least one recessive gene for that trait
WW x ww
AA x aa

2. Term used to refer to an organism that has two identical alleles for a particular trait BB
homo
phenotype
Bb
homozygous

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
chances a child would be polydactly
23
dominance
WW x ww

4. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
chances a child would be polydactly
Both parent horses are heterozygous for hair color
independent assortment
example of dominant trait

5. 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
hetero
chances a child would be polydactly
P is dominant
Polydactyly

6. 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?
hetero
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
Heterozygous for that trait
chromosomes

7. Different forms of a gene
23
segregation
heterozygous
alleles

8. How many pairs of chromosomes do humans have?
hetero
23
to show dominant trait only need
homo

9. 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...
Both parent horses are heterozygous for hair color
Bb
recessive
hetero

10. 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...
chromosomes
pure
hetero
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

11. Threadlike structures made of DNA molecules that contain the genes.
chromosomes
Both parents carried at least one recessive gene for that trait
Polydactyly
autosomes

12. 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
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?
P is dominant

13. 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
example of dominant trait
heterozygous
recessive

14. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
alleles
Polydactyly
AA x aa
Heterozygous for that trait

15. 6 fingers F
incomplete dominance
pure
example of dominant trait
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

16. Term used to refer to an organism that has two different alleles for the same trait Bb
P is dominant
phenotype
heterozygous
to show dominant trait only need

17. One capitol letter W
WW x ww
Bb
homo
to show dominant trait only need

18. P is reccessive
P is dominant
incomplete dominance
Polydactyly
hetero

19. 2 organisms may show the same trait - yet have different genotypes for that phenotype
Both parents carried at least one recessive gene for that trait
Polydactyly
One is homozygous dominant and the other is heterozygous
alleles

20. Different Bb
P is dominant
heterozygous
segregation
hetero

21. Chromosomes that do not determine the sex of an individual
P is dominant
dominance
to show dominant trait only need
autosomes

22. Kids heterozygous Ww
Both parents carried at least one recessive gene for that trait
25% black - 50% gray - 25% white
WW x ww
pure

23. Creates a blended phenotype; one allele is not completely dominant over the other
pure
Polydactyly
alleles
incomplete dominance

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

25. An organism's physical appearance - or visible traits
phenotype
chances a child would be polydactly
Both parents carried at least one recessive gene for that trait
Bb

26. The appearnce of a recessive trait in offspring of animals most probably indicates that...
25% black - 50% gray - 25% white
P is dominant
Both parents carried at least one recessive gene for that trait
heterozygous

27. 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
dominance
independent assortment
recessive

28. 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
Polydactyly
25% black - 50% gray - 25% white
recessive

29. Having two like genes
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?
pure
Both parent horses are heterozygous for hair color

30. 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?
autosomes
hetero
recessive

31. Same BB
Both parents carried at least one recessive gene for that trait
Bb
homo
WW x ww

32. 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?
homo
dominance
chromosomes
Bb

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