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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
Both parents carried at least one recessive gene for that trait
to show dominant trait only need
alleles
chances a child would be polydactly

2. 2 organisms may show the same trait - yet have different genotypes for that phenotype
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
segregation
One is homozygous dominant and the other is heterozygous
chances a child would be polydactly

3. Having two like genes
P is dominant
Both parents carried at least one recessive gene for that trait
alleles
pure

4. 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?
recessive
Heterozygous for that trait
25% black - 50% gray - 25% white

5. 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
autosomes
phenotype
One is homozygous dominant and the other is heterozygous
independent assortment

6. 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
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
dominance
example of dominant trait
chromosomes

7. Threadlike structures made of DNA molecules that contain the genes.
Polydactyly
incomplete dominance
chromosomes
WW x ww

8. 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
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
incomplete dominance
segregation

9. Same BB
independent assortment
example of dominant trait
One is homozygous dominant and the other is heterozygous
homo

10. Explain how organisms can have the same phenotypes and different genotypes.
independent assortment
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
25% black - 50% gray - 25% white
chances a child would be polydactly

11. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
P is dominant
Polydactyly
incomplete dominance
segregation

12. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
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?
One is homozygous dominant and the other is heterozygous
Heterozygous for that trait

13. Different Bb
segregation
chromosomes
hetero
P is dominant

14. 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...
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
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?
Polydactyly
WW x ww

15. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
P is dominant
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
recessive
chromosomes

16. P is reccessive
heterozygous
Both parents carried at least one recessive gene for that trait
P is dominant
WW x ww

17. 6 fingers F
Both parents carried at least one recessive gene for that trait
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
example of dominant trait
incomplete dominance

18. Term used to refer to an organism that has two different alleles for the same trait Bb
alleles
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
phenotype
heterozygous

19. An organism's physical appearance - or visible traits
to show dominant trait only need
chromosomes
homo
phenotype

20. One capitol letter W
Bb
alleles
autosomes
to show dominant trait only need

21. Chromosomes that do not determine the sex of an individual
autosomes
AA x aa
23
example of dominant trait

22. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
chances a child would be polydactly
WW x ww
23
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15

23. How many pairs of chromosomes do humans have?
alleles
23
Bb
Both parent horses are heterozygous for hair color

24. Term used to refer to an organism that has two identical alleles for a particular trait BB
Bb
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?
P is dominant

25. 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
23
AA x aa
P is dominant

26. 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
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?
Polydactyly
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
segregation

27. 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.
incomplete dominance
Bb
25% black - 50% gray - 25% white
chances a child would be polydactly

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?
pure
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
independent assortment
AA x aa

29. 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
P is dominant
Both parent horses are heterozygous for hair color
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
WW x ww

30. Kids heterozygous Ww
Heterozygous for that trait
WW x ww
23
heterozygous

31. 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
heterozygous
hetero
homozygous

32. Creates a blended phenotype; one allele is not completely dominant over the other
to show dominant trait only need
independent assortment
recessive
incomplete dominance

33. 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?
homozygous
Bb
autosomes
chromosomes