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22. In a certain species of dog, a black nose is dominant over a pink nose. If my dog Gunner is homozygous for a pink nose and she mates with a purebred dominant male, what is the ratio of black to pink noses?
DD, Dd
Genetic Engineering
3:1
b. two organisms of different species mate to make a new organism.
75
all black
a spiral staircase
hybrid, purebred
A strange disorder causing toes to sprout out of one’s back is discovered to be dominant. A heterozygous female marries a heterozygous male. What percentage of the offspring will have fingers sprouting out of their back?
DD, Dd
Genetic Engineering
3:1
b. two organisms of different species mate to make a new organism.
75
all black
a spiral staircase
hybrid, purebred
A hybrid organism can result when...
DD, Dd
Genetic Engineering
3:1
b. two organisms of different species mate to make a new organism.
75
all black
a spiral staircase
hybrid, purebred
Altering the DNA of an organism in order to get the traits we want is called ____.
DD, Dd
Genetic Engineering
3:1
b. two organisms of different species mate to make a new organism.
75
all black
a spiral staircase
hybrid, purebred
7. DNA is a double helix which means that it is shaped like a __________.
DD, Dd
Genetic Engineering
3:1
b. two organisms of different species mate to make a new organism.
75
all black
a spiral staircase
hybrid, purebred
19. Dimples are dominant to no dimples. Ben’s mom is heterozygous for dimples and his dad is homozygous dominant for the trait. What genotypes can result from the cross of Ben’s parents?
DD, Dd
Genetic Engineering
3:1
b. two organisms of different species mate to make a new organism.
75
all black
a spiral staircase
hybrid, purebred
23. In parakeets, the ability to talk is a dominant trait. A heterozygous talker is mated with a non-talking parakeet. What is the ratio of talkers to non-talkers?
DD, Dd
Genetic Engineering
3:1
b. two organisms of different species mate to make a new organism.
75
all black
a spiral staircase
hybrid, purebred
16. An organism whose genotype is Tt is considered a ________ while an organism with the genotype tt is a _________.
DD, Dd
Genetic Engineering
3:1
b. two organisms of different species mate to make a new organism.
75
all black
a spiral staircase
hybrid, purebred
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