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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. The appearnce of a recessive trait in offspring of animals most probably indicates that...
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
Heterozygous for that trait
phenotype

2. Same BB
heterozygous
homo
AA x aa
Polydactyly

3. 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
chances a child would be polydactly
WW x ww

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

5. Creates a blended phenotype; one allele is not completely dominant over the other
independent assortment
25% black - 50% gray - 25% white
incomplete dominance
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15

6. 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
One is homozygous dominant and the other is heterozygous
25% black - 50% gray - 25% white
segregation

7. P is reccessive
incomplete dominance
P is dominant
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
Both parent horses are heterozygous for hair color

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

9. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
Both parent horses are heterozygous for hair color
Bb
Both parents carried at least one recessive gene for that trait
recessive

10. Different forms of a gene
alleles
chances a child would be polydactly
recessive
example of dominant trait

11. How many pairs of chromosomes do humans have?
23
WW x ww
homozygous
Heterozygous for that trait

12. Dominance B
example of dominant trait
Bb
dominance
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?

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
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?
independent assortment
segregation

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
Heterozygous for that trait
chances a child would be polydactly
25% black - 50% gray - 25% white

15. Different Bb
WW x ww
25% black - 50% gray - 25% white
hetero
Both parents carried at least one recessive gene for that trait

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
dominance
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
recessive
Both parent horses are heterozygous for hair color

17. Term used to refer to an organism that has two different alleles for the same trait Bb
to show dominant trait only need
alleles
WW x ww
heterozygous

18. 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
homo
AA x aa
23
independent assortment

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
One is homozygous dominant and the other is heterozygous
to show dominant trait only need
independent assortment

20. 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?
Bb
alleles
25% black - 50% gray - 25% white
23

21. Threadlike structures made of DNA molecules that contain the genes.
WW x ww
incomplete dominance
25% black - 50% gray - 25% white
chromosomes

22. 6 fingers F
phenotype
chromosomes
example of dominant trait
P is dominant

23. 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
Polydactyly
incomplete dominance
Both parent horses are heterozygous for hair color
segregation

24. 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
incomplete dominance
23
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15

25. Term used to refer to an organism that has two identical alleles for a particular trait BB
homozygous
autosomes
homo
chances a child would be polydactly

26. Kids heterozygous Ww
chromosomes
independent assortment
WW x ww
hetero

27. 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...
heterozygous
to show dominant trait only need
homozygous
Both parent horses are heterozygous for hair color

28. Having two like genes
pure
homo
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?

29. An organism's physical appearance - or visible traits
to show dominant trait only need
Bb
recessive
phenotype

30. One capitol letter W
to show dominant trait only need
pure
23
homozygous

31. 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
hetero
independent assortment
Both parents carried at least one recessive gene for that trait

32. Chromosomes that do not determine the sex of an individual
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
chances a child would be polydactly
autosomes
WW x ww

33. 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
autosomes
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?
segregation
WW x ww