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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. 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
incomplete dominance
homozygous
AA x aa
independent assortment

2. How many pairs of chromosomes do humans have?
dominance
One is homozygous dominant and the other is heterozygous
23
Bb

3. Threadlike structures made of DNA molecules that contain the genes.
P is dominant
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
chromosomes
example of dominant trait

4. Kids heterozygous Ww
hetero
WW x ww
segregation
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...
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
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
AA x aa

6. 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?
phenotype
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
Bb
homozygous

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?
Bb
heterozygous
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
phenotype

8. P is reccessive
WW x ww
P is dominant
chromosomes
autosomes

9. 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...
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?
Both parent horses are heterozygous for hair color
WW x ww

10. Explain how organisms can have the same phenotypes and different genotypes.
25% black - 50% gray - 25% white
incomplete dominance
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
Both parent horses are heterozygous for hair color

11. Different forms of a gene
autosomes
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
pure
alleles

12. Chromosomes that do not determine the sex of an individual
Polydactyly
recessive
autosomes
Both parents carried at least one recessive gene for that trait

13. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
chromosomes
segregation
homozygous
recessive

14. Term used to refer to an organism that has two identical alleles for a particular trait BB
dominance
example of dominant trait
homozygous
WW x ww

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

16. Creates a blended phenotype; one allele is not completely dominant over the other
independent assortment
phenotype
incomplete dominance
Polydactyly

17. 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?
One is homozygous dominant and the other is heterozygous
WW x ww
23

18. Same BB
Heterozygous for that trait
Polydactyly
alleles
homo

19. Having two like genes
example of dominant trait
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
pure
AA x aa

20. Different Bb
dominance
independent assortment
hetero
homozygous

21. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
recessive
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
25% black - 50% gray - 25% white
WW x ww

22. 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
hetero
Both parents carried at least one recessive gene for that trait
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?

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.
WW x ww
25% black - 50% gray - 25% white
phenotype
Polydactyly

24. 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
dominance
Polydactyly
phenotype
Both parent horses are heterozygous for hair color

25. 6 fingers F
example of dominant trait
Both parents carried at least one recessive gene for that trait
Both parent horses are heterozygous for hair color
to show dominant trait only need

26. Term used to refer to an organism that has two different alleles for the same trait Bb
heterozygous
phenotype
homozygous
to show dominant trait only need

27. Dominance B
example of dominant trait
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
segregation

28. One capitol letter W
One is homozygous dominant and the other is heterozygous
homo
to show dominant trait only need
Polydactyly

29. 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
WW x ww
AA x aa
25% black - 50% gray - 25% white
Both parents carried at least one recessive gene for that trait

30. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
chances a child would be polydactly
dominance
WW x ww
incomplete dominance

31. 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
segregation
One is homozygous dominant and the other is heterozygous
Heterozygous for that trait

32. An organism's physical appearance - or visible traits
chromosomes
example of dominant trait
phenotype
P is dominant

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
WW x ww
chances a child would be polydactly
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?