Genetics Practice Question Preview (ID: 60458)


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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?
a) all black
b) 2 black, 2 pink
c) 3 black, 1 pink
d) 1 black, 3 pink

If the body cells in an organism have 10 chromosomes, then the sex cells produced during meiosis would have _____ chromosomes.
a) 20
b) 15
c) 10
d) 5

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?
a) DD, dd
b) DD, Dd
c) DD, Dd, dd
d) all Dd

21. In purple-people-eaters, one horn is dominant and no horn is recessive. If a purple-people-eater that is heterozygous for horns crosses with one that does not have horns, what are the genotypes of the parents?
a) ALL HH
b) ALL hh
c) Hh, hh
d) HH, hh

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?
a) 25
b) 50
c) 75
d) 100

A hybrid organism can result when...
a) a. two organisms that have the SAME genes mate.
b) b. two organisms of different species mate to make a new organism.
c) c. the DNA from one organism is copied to make an exact replica of the original
d) d. the RNA from one organism is copied and put into another.

16. An organism whose genotype is Tt is considered a ________ while an organism with the genotype tt is a _________.
a) clone, asexual
b) hybrid, purebred
c) purebred, hybrid
d) pureblood, mudblood

14. Cloning is like _______ reproduction in that it creates ______
a) sexual; a new organism that is different from the parent organism.
b) asexual; an exact copy of the parent organism.
c) unsexual; two new cells that have a similar shape.
d) sexual; a baby from two parents.

____________makes two identical body cells, while ___________ makes sex cells like the sperm and egg.
a) Meiosis; Mitosis
b) Inbreeding; selective breeding
c) Cloning; Hybridization
d) Mitosis; Meiosis

Proteins are made by reading the __________ given by _________.
a) map; ribsomes
b) instructions; DNA
c) words; tRNA
d) book; mRNA

What does the nucleus of the cell contain and what does it do?
a) ribsomes; makes proteins.
b) lysosomes; disposal of the cell.
c) DNA; directs all cell activities.
d) mitochondria; makes energy for cell.

7. DNA is a double helix which means that it is shaped like a __________.
a) blob of snot
b) a spiral staircase
c) a step stool
d) a round table

8. What would the complementary strand of DNA be for the sequence of bases ACCTAGTTG?
a) CAAGCTGGT
b) TGGATCAAC
c) GTTCGACCA
d) ACCTAGTTG

In our activity where you made a baby, who determined the sex of the offspring and why?
a) The female because she carries the baby.
b) The male because he carries both X and Y chromosomes
c) The male, because he’s big and strong
d) The female because she carries both X and Y

The combination Tt represents a ___ genotype, where T means ___, and t means ___.
a) heterozygous; dominant; recessive
b) purebred; recessive; dominant
c) homozygous; dominant; recessive
d) sex-linked; recessive; dominant

6. During our “A Game of Chance” activity where you were “making a baby”, what was the % chance of having a boy versus a girl?
a) 50% : 50%
b) 75% : 25%
c) 25% : 75%
d) 100% : 0%

Altering the DNA of an organism in order to get the traits we want is called ____.
a) Human Genome
b) Inbreeding
c) Hybridization
d) Genetic Engineering

4. When we did the PTC lab, it was found that tasting for PTC is a dominant trait. Would a non-taster also have to have a non-taster as a parent?
a) No, because both parents could be heterozygous and carry the recessive trait
b) Yes, both parents would have to be recessive also.
c) Yes, you could only get that result by mating a homozygous taster with a non-taster.
d) No, you could mate two homozygous tasters and have a non-tasting child.

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?
a) 1:3
b) 2:2
c) 3:1
d) 4:0

In sexual reproduction, a new organism is produced when
a) body cells divide by mitosis
b) an organism divides into two equal parts
c) new organism grows from the body of its parent
d) sex cells, sperm and egg, come together

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