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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. Different forms of a gene
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
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?
Heterozygous for that trait

2. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
recessive
Both parents carried at least one recessive gene for that trait
25% black - 50% gray - 25% white
pure

3. Explain how organisms can have the same phenotypes and different genotypes.
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
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
to show dominant trait only need

4. 6 fingers F
example of dominant trait
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
recessive
autosomes

5. 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...
incomplete dominance
Bb
Both parents carried at least one recessive gene for that trait
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

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

7. How many pairs of chromosomes do humans have?
23
WW x ww
hetero
alleles

8. 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?
AA x aa
homo
One is homozygous dominant and the other is heterozygous
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15

9. Threadlike structures made of DNA molecules that contain the genes.
alleles
Both parent horses are heterozygous for hair color
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?

10. 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
heterozygous
WW x ww
Both parent horses are heterozygous for hair color
hetero

11. One capitol letter W
to show dominant trait only need
segregation
independent assortment
hetero

12. 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
homo
23
Both parent horses are heterozygous for hair color

13. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
chances a child would be polydactly
recessive
WW x ww

14. P is reccessive
heterozygous
dominance
phenotype
P is dominant

15. 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
homozygous
chances a child would be polydactly
Both parent horses are heterozygous for hair color
independent assortment

16. 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
chances a child would be polydactly
alleles
dominance
Both parents carried at least one recessive gene for that trait

17. 2 organisms may show the same trait - yet have different genotypes for that phenotype
example of dominant trait
heterozygous
One is homozygous dominant and the other is heterozygous
WW x ww

18. 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
segregation
recessive
alleles

19. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
Heterozygous for that trait
incomplete dominance
pure

20. Dominance B
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?
25% black - 50% gray - 25% white
autosomes

21. Different Bb
hetero
25% black - 50% gray - 25% white
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
dominance

22. 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?
dominance
homozygous
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?
Bb

23. 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.
example of dominant trait
One is homozygous dominant and the other is heterozygous
phenotype
25% black - 50% gray - 25% white

24. Chromosomes that do not determine the sex of an individual
phenotype
Polydactyly
incomplete dominance
autosomes

25. Creates a blended phenotype; one allele is not completely dominant over the other
Bb
incomplete dominance
One is homozygous dominant and the other is heterozygous
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

26. 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
hetero
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

27. Kids heterozygous Ww
recessive
WW x ww
chromosomes
alleles

28. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
independent assortment
segregation
WW x ww
25% black - 50% gray - 25% white

29. 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
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
chromosomes
Polydactyly
AA x aa

30. Same BB
Polydactyly
chromosomes
homo
phenotype

31. An organism's physical appearance - or visible traits
Bb
chances a child would be polydactly
phenotype
example of dominant trait

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

33. Having two like genes
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
recessive
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
pure