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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
phenotype
independent assortment
heterozygous
homo

2. 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
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 parents carried at least one recessive gene for that trait
25% black - 50% gray - 25% white

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...
One is homozygous dominant and the other is heterozygous
independent assortment
Heterozygous for that trait
Bb

4. 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
to show dominant trait only need
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
Bb

5. 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.
25% black - 50% gray - 25% white
AA x aa
Polydactyly
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

6. Term used to refer to an organism that has two identical alleles for a particular trait BB
WW x ww
25% black - 50% gray - 25% white
homozygous
chromosomes

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?
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
25% black - 50% gray - 25% white
One is homozygous dominant and the other is heterozygous
Heterozygous for that trait

8. 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
autosomes
Polydactyly
Bb
incomplete dominance

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
recessive
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
WW x ww

10. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
chances a child would be polydactly
recessive
One is homozygous dominant and the other is heterozygous
23

11. Kids heterozygous Ww
One is homozygous dominant and the other is heterozygous
WW x ww
25% black - 50% gray - 25% white
pure

12. Different Bb
dominance
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
hetero
phenotype

13. Threadlike structures made of DNA molecules that contain the genes.
homozygous
One is homozygous dominant and the other is heterozygous
chromosomes
Both parents carried at least one recessive gene for that trait

14. 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
segregation
phenotype
WW x ww
to show dominant trait only need

15. Same BB
alleles
25% black - 50% gray - 25% white
chances a child would be polydactly
homo

16. 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 mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
homozygous
One is homozygous dominant and the other is heterozygous

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

18. Term used to refer to an organism that has two different alleles for the same trait Bb
recessive
heterozygous
autosomes
chromosomes

19. 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...
independent assortment
alleles
homo
Both parent horses are heterozygous for hair color

20. 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
Bb
dominance

21. Creates a blended phenotype; one allele is not completely dominant over the other
chances a child would be polydactly
incomplete dominance
AA x aa
chromosomes

22. Chromosomes that do not determine the sex of an individual
recessive
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
autosomes
incomplete dominance

23. 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
segregation
incomplete dominance
AA x aa
23

24. 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
AA x aa
homo
homozygous

25. An organism's physical appearance - or visible traits
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?
autosomes
pure
phenotype

26. One capitol letter W
incomplete dominance
alleles
to show dominant trait only need
Bb

27. Having two like genes
homozygous
segregation
pure
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

28. Different forms of a gene
alleles
AA x aa
WW x ww
autosomes

29. How many pairs of chromosomes do humans have?
example of dominant trait
23
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?

30. 6 fingers F
example of dominant trait
25% black - 50% gray - 25% white
Both parents carried at least one recessive gene for that trait
Bb

31. 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
autosomes
independent assortment
Polydactyly

32. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
segregation
pure
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?
AA x aa

33. P is reccessive
chances a child would be polydactly
autosomes
P is dominant
alleles