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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. How many pairs of chromosomes do humans have?
autosomes
WW x ww
23
WW x ww

2. 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
Both parent horses are heterozygous for hair color
independent assortment
autosomes
pure

3. 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?
Both parent horses are heterozygous for hair color
example of dominant trait
One is homozygous dominant and the other is heterozygous
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15

4. Threadlike structures made of DNA molecules that contain the genes.
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb
chromosomes
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
homo

5. 6 fingers F
Both parents carried at least one recessive gene for that trait
One is homozygous dominant and the other is heterozygous
example of dominant trait
WW x ww

6. Chromosomes that do not determine the sex of an individual
autosomes
segregation
pure
homo

7. One capitol letter W
to show dominant trait only need
AA x aa
example of dominant trait
Polydactyly

8. Term used to refer to an organism that has two identical alleles for a particular trait BB
Bb
One is homozygous dominant and the other is heterozygous
homozygous
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid

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

10. P is reccessive
homo
Both parents carried at least one recessive gene for that trait
Both parent horses are heterozygous for hair color
P is dominant

11. For a given trait - the 2 genes of an allelic pair are not alike. An individual possessing this gene combination is said to be...
alleles
Heterozygous for that trait
to show dominant trait only need
Both parents carried at least one recessive gene for that trait

12. Kids heterozygous Ww
Bb
alleles
heterozygous
WW x ww

13. Man is Pp and woman is pp Pp x pp equals Pp - Pp - pp - pp 50% chance
25% black - 50% gray - 25% white
chances a child would be polydactly
Polydactyly
to show dominant trait only need

14. 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
Both parent horses are heterozygous for hair color
independent assortment
Heterozygous for that trait

15. 2 organisms may show the same trait - yet have different genotypes for that phenotype
chromosomes
One is homozygous dominant and the other is heterozygous
autosomes
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

16. 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?
segregation
AA x aa
to show dominant trait only need
Bb

17. Same BB
WW x ww
homo
Bb
autosomes

18. 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
WW x ww
dominance
homo
homozygous

19. 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
Bb
homo
heterozygous

20. 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
Tt x Tt = TT - Tt - Tt - tt the tt is recessive 60 divide 4 is 15
to show dominant trait only need
homo

21. The inherited characteristic often masked by the dominant characteristic and not seen in an organism. 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?
25% black - 50% gray - 25% white
recessive
chromosomes

22. Dominance B
25% black - 50% gray - 25% white
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?
1 BB: 2 Bb: 1 bb 2 heterozygous Bb x Bb

23. Different forms of a gene
Heterozygous for that trait
chromosomes
alleles
AA x aa

24. (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
homo
segregation
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
One is homozygous dominant and the other is heterozygous

25. 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
chromosomes
AA x aa
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?

26. Different Bb
hetero
Heterozygous for that trait
phenotype
WW x ww

27. Creates a blended phenotype; one allele is not completely dominant over the other
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?
homozygous
incomplete dominance
homo

28. 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
23
Polydactyly
Bb
Heterozygous for that trait

29. An organism's physical appearance - or visible traits
Both parents carried at least one recessive gene for that trait
recessive
phenotype
Heterozygous for that trait

30. 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
WW x ww
Both parents carried at least one recessive gene for that trait
heterozygous

31. Explain how organisms can have the same phenotypes and different genotypes.
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
segregation
One is homozygous dominant and the other is heterozygous
phenotype

32. Term used to refer to an organism that has two different alleles for the same trait Bb
One mouse can be homozygous dominant BB and one is heterozygous Bb or hybrid
chromosomes
Both parents carried at least one recessive gene for that trait
heterozygous

33. 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
23
segregation
incomplete dominance