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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. Chromosomes that do not determine the sex of an individual
23
segregation
independent assortment
autosomes

2. 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
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
pure
independent assortment
WW x ww

3. Different forms of a gene
One is homozygous dominant and the other is heterozygous
pure
dominance
alleles

4. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
recessive
Both parents carried at least one recessive gene for that trait
25% black - 50% gray - 25% white
segregation

5. 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
dominance
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
chances a child would be polydactly

6. 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
alleles
Both parents carried at least one recessive gene for that trait
23

7. 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?
homo
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?
incomplete dominance
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15

8. 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...
to show dominant trait only need
25% black - 50% gray - 25% white
independent assortment
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

9. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
chances a child would be polydactly
heterozygous
to show dominant trait only need
chromosomes

10. 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
One is homozygous dominant and the other is heterozygous
independent assortment
homo
dominance

11. An organism's physical appearance - or visible traits
incomplete dominance
heterozygous
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
phenotype

12. Different Bb
Polydactyly
WW x ww
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
hetero

13. One capitol letter W
example of dominant trait
to show dominant trait only need
WW x ww
P is dominant

14. 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?
example of dominant trait
Both parent horses are heterozygous for hair color
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

15. 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.
autosomes
25% black - 50% gray - 25% white
homo
hetero

16. Dominance B
Both parent horses are heterozygous for hair color
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
segregation

17. 6 fingers F
hetero
example of dominant trait
WW x ww
homo

18. 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?
chances a child would be polydactly
Both parent horses are heterozygous for hair color
Bb
alleles

19. Term used to refer to an organism that has two identical alleles for a particular trait BB
phenotype
example of dominant trait
homozygous
23

20. Having two like genes
autosomes
independent assortment
chances a child would be polydactly
pure

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

22. 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
dominance
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
Heterozygous for that trait

23. The appearnce of a recessive trait in offspring of animals most probably indicates that...
chances a child would be polydactly
dominance
pure
Both parents carried at least one recessive gene for that trait

24. Term used to refer to an organism that has two different alleles for the same trait Bb
heterozygous
Heterozygous for that trait
alleles
Both parents carried at least one recessive gene for that trait

25. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
25% black - 50% gray - 25% white
phenotype
recessive
WW x ww

26. 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
chromosomes
WW x ww
autosomes

27. Same BB
Both parents carried at least one recessive gene for that trait
homo
23
incomplete dominance

28. P is reccessive
dominance
P is dominant
WW x ww
segregation

29. Threadlike structures made of DNA molecules that contain the genes.
dominance
25% black - 50% gray - 25% white
phenotype
chromosomes

30. Creates a blended phenotype; one allele is not completely dominant over the other
WW x ww
One is homozygous dominant and the other is heterozygous
Polydactyly
incomplete dominance

31. 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
Bb
homozygous
pure

32. 2 organisms may show the same trait - yet have different genotypes for that phenotype
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 parents carried at least one recessive gene for that trait
One is homozygous dominant and the other is heterozygous

33. Kids heterozygous Ww
chromosomes
WW x ww
homozygous
P is dominant