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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. 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
example of dominant trait
incomplete dominance
chromosomes

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

3. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
Heterozygous for that trait
chromosomes
alleles
Bb

4. 6 fingers F
chances a child would be polydactly
One is homozygous dominant and the other is heterozygous
WW x ww
example of dominant trait

5. Threadlike structures made of DNA molecules that contain the genes.
chances a child would be polydactly
chromosomes
homo
phenotype

6. Term used to refer to an organism that has two different alleles for the same trait Bb
Bb
heterozygous
chromosomes
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

7. 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
Both parents carried at least one recessive gene for that trait
dominance
example of dominant trait
WW x ww

8. The appearnce of a recessive trait in offspring of animals most probably indicates that...
Bb
Both parents carried at least one recessive gene for that trait
pure
chromosomes

9. 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?
Both parents carried at least one recessive gene for that trait
One is homozygous dominant and the other is heterozygous
Bb
incomplete dominance

10. P is reccessive
hetero
P is dominant
Both parents carried at least one recessive gene for that trait
incomplete dominance

11. Same BB
incomplete dominance
segregation
homo
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

12. An organism's physical appearance - or visible traits
25% black - 50% gray - 25% white
heterozygous
Both parents carried at least one recessive gene for that trait
phenotype

13. Term used to refer to an organism that has two identical alleles for a particular trait BB
homozygous
P is dominant
phenotype
WW x ww

14. Kids heterozygous Ww
Both parent horses are heterozygous for hair color
WW x ww
hetero
23

15. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
phenotype
Heterozygous for that trait
One is homozygous dominant and the other is heterozygous
chances a child would be polydactly

16. 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.
Heterozygous for that trait
example of dominant trait
segregation
25% black - 50% gray - 25% white

17. Explain how organisms can have the same phenotypes and different genotypes.
hetero
example of dominant trait
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
23

18. One capitol letter W
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
alleles
to show dominant trait only need
One is homozygous dominant and the other is heterozygous

19. Different Bb
homo
hetero
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
pure

20. 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
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
pure
Bb

21. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
hetero
segregation
AA x aa
independent assortment

22. Having two like genes
pure
recessive
dominance
incomplete dominance

23. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
phenotype
alleles
recessive
AA x aa

24. 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
autosomes
Both parents carried at least one recessive gene for that trait
incomplete dominance

25. 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
hetero
25% black - 50% gray - 25% white
pure
WW x ww

26. 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?
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
One is homozygous dominant and the other is heterozygous
Polydactyly

27. 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
to show dominant trait only need
heterozygous
homozygous

28. Chromosomes that do not determine the sex of an individual
autosomes
heterozygous
25% black - 50% gray - 25% white
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

29. 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...
WW x ww
Polydactyly
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?
Both parent horses are heterozygous for hair color

30. Creates a blended phenotype; one allele is not completely dominant over the other
23
incomplete dominance
Both parent horses are heterozygous for hair color
heterozygous

31. Dominance B
23
25% black - 50% gray - 25% white
segregation
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?

32. How many pairs of chromosomes do humans have?
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?
chances a child would be polydactly
23
heterozygous

33. Different forms of a gene
alleles
recessive
hetero
homo