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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. 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
P is dominant
One is homozygous dominant and the other is heterozygous

2. Threadlike structures made of DNA molecules that contain the genes.
chromosomes
homozygous
phenotype
Both parents carried at least one recessive gene for that trait

3. An organism's physical appearance - or visible traits
One is homozygous dominant and the other is heterozygous
example of dominant trait
phenotype
heterozygous

4. 2 organisms may show the same trait - yet have different genotypes for that phenotype
hetero
Heterozygous for that trait
One is homozygous dominant and the other is heterozygous
segregation

5. Different Bb
chances a child would be polydactly
hetero
homozygous
chromosomes

6. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
WW x ww
chances a child would be polydactly
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
Both parents carried at least one recessive gene for that trait

7. Different forms of a gene
chances a child would be polydactly
example of dominant trait
independent assortment
alleles

8. Term used to refer to an organism that has two identical alleles for a particular trait BB
chances a child would be polydactly
homozygous
chromosomes
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

9. Having two like genes
pure
hetero
heterozygous
example of dominant trait

10. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. bb
Heterozygous for that trait
recessive
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

11. Kids heterozygous Ww
homozygous
WW x ww
autosomes
P is dominant

12. Term used to refer to an organism that has two different alleles for the same trait Bb
Heterozygous for that trait
heterozygous
AA x aa
incomplete dominance

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

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

15. 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...
segregation
recessive
AA x aa
Both parent horses are heterozygous for hair color

16. 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
segregation
alleles
Both parents carried at least one recessive gene for that trait

17. 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?
23
WW x ww
Bb
Both parent horses are heterozygous for hair color

18. 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
chances a child would be polydactly
independent assortment
pure
incomplete dominance

19. 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.
homozygous
chances a child would be polydactly
25% black - 50% gray - 25% white
to show dominant trait only need

20. 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
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
dominance
23

21. P is reccessive
P is dominant
independent assortment
incomplete dominance
23

22. 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
autosomes
pure
23
WW x ww

23. Chromosomes that do not determine the sex of an individual
Bb
to show dominant trait only need
Both parent horses are heterozygous for hair color
autosomes

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

25. One capitol letter W
Bb
heterozygous
segregation
to show dominant trait only need

26. 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...
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
Bb
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
to show dominant trait only need

27. Same BB
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?
homo
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

28. Dominance B
Heterozygous for that trait
P is dominant
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?

29. 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?
pure
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
recessive
Heterozygous for that trait

30. Creates a blended phenotype; one allele is not completely dominant over the other
phenotype
chances a child would be polydactly
incomplete dominance
hetero

31. 6 fingers F
example of dominant trait
to show dominant trait only need
AA x aa
chances a child would be polydactly

32. How many pairs of chromosomes do humans have?
Heterozygous for that trait
pure
Both parents carried at least one recessive gene for that trait
23

33. 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
P is dominant
WW x ww
independent assortment
Polydactyly