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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
autosomes
Bb
Both parents carried at least one recessive gene for that trait
hetero

2. Creates a blended phenotype; one allele is not completely dominant over the other
Both parent horses are heterozygous for hair color
incomplete dominance
WW x ww
autosomes

3. 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
dominance
AA x aa
example of dominant trait

4. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
Both parents carried at least one recessive gene for that trait
recessive
chances a child would be polydactly
independent assortment

5. 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
AA x aa
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15

6. Kids heterozygous Ww
recessive
segregation
WW x ww
homo

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?
One is homozygous dominant and the other is heterozygous
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
23

8. 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
One is homozygous dominant and the other is heterozygous
Both parent horses are heterozygous for hair color
phenotype

9. 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
hetero
independent assortment
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
homozygous

10. 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
independent assortment
hetero

11. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
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?
Polydactyly
chances a child would be polydactly
Heterozygous for that trait

12. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
to show dominant trait only need
Heterozygous for that trait
example of dominant trait
dominance

13. One capitol letter W
dominance
WW x ww
to show dominant trait only need
independent assortment

14. Same BB
25% black - 50% gray - 25% white
homo
to show dominant trait only need
pure

15. Having two like genes
pure
segregation
WW x ww
dominance

16. Different forms of a gene
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
example of dominant trait
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
alleles

17. 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
Heterozygous for that trait
segregation
pure
Polydactyly

18. Threadlike structures made of DNA molecules that contain the genes.
homo
chromosomes
phenotype
incomplete dominance

19. 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
chromosomes
homo
Both parents carried at least one recessive gene for that trait

20. Dominance B
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?
P is dominant
Both parent horses are heterozygous for hair color

21. 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.
incomplete dominance
25% black - 50% gray - 25% white
alleles
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

22. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
segregation
Both parent horses are heterozygous for hair color
23
independent assortment

23. Term used to refer to an organism that has two identical alleles for a particular trait BB
independent assortment
phenotype
homozygous
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15

24. An organism's physical appearance - or visible traits
phenotype
homozygous
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
hetero

25. 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...
P is dominant
incomplete dominance
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
AA x aa

26. Different Bb
phenotype
hetero
homo
segregation

27. Explain how organisms can have the same phenotypes and different genotypes.
homozygous
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
AA x aa
23

28. How many pairs of chromosomes do humans have?
recessive
Both parents carried at least one recessive gene for that trait
23
AA x aa

29. P is reccessive
P is dominant
AA x aa
homo
25% black - 50% gray - 25% white

30. The appearnce of a recessive trait in offspring of animals most probably indicates that...
homo
to show dominant trait only need
autosomes
Both parents carried at least one recessive gene for that trait

31. 6 fingers F
example of dominant trait
Bb
incomplete 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?

32. 2 organisms may show the same trait - yet have different genotypes for that phenotype
P is dominant
heterozygous
One is homozygous dominant and the other is heterozygous
homozygous

33. Term used to refer to an organism that has two different alleles for the same trait Bb
pure
heterozygous
phenotype
incomplete dominance