Name _________________________
Date __________________ Per ____
7th Grade, Unit 4 Plants and Animals Reproduce
1. Hair color in humans is an inherited trait. How is it possible for two people who had brown hair from birth to
produce a child with blond hair?
2. A son can inherit traits
A) only from his father.
C) from both his father and his mother.
B) only from his mother.
D) from either his father or his mother, but not from both.
3. Which of the following is the best way to determine whether two people are related?
A) Compare their blood types.
B) Compare their handwriting.
C) Compare their genes.
D) Compare their fingerprints.
4. Animals that reproduce sexually differ from animals that reproduce asexually in that sexually reproducing
animals have
A) offspring that are nearly identical to their parents
B) more genetic variation among their offspring
C) offspring that are perfectly adapted to their parents’ habitat
D) a larger number of offspring
5. Which statement about the offspring that result from sexual reproduction is generally true?
A) The offspring show genetic variation from the parents.
B) The offspring have genetic material identical to that of one another.
C) The offspring have genetic material identical to that of one of the parents.
D) The offspring have twice as much genetic material as each parent.
6. Which statement about DNA is correct?
A) A child's DNA will be unrelated to the mother's or father's DNA.
B) A child's DNA will show similarities to both the mother's and father's DNA.
C) A female child's DNA will exactly match the mother's DNA.
D) A male child's DNA will exactly match the father's DNA.
7. The cows in a rancher's herd of cattle have been selectively bred to produce milk. Which of the following will
cause the next generation of cows to receive the trait for producing large quantities of milk?
A) nutrients in the cows’ food
B) essential minerals in the cows’ water
C) electrical impulses in the cows’ brains
D) information in the cows’ chromosomes
8. An Olympic gold medalist in cross-country skiing has a gene which causes him to produce 50% more
hemoglobin than the average person. Which of these most likely caused this trait?
A) a special diet designed for the skier
B) the climate where the skier lives
C) the training routine of the skier
D) a mutation carried by the skier
9. If Jessica has light eyes (bb) and both of her parents have dark eyes (Bb) which statement is true?
A) Jessica inherited both genes from her father.
B) Jessica inherited both genes from her mother.
C) Jessica inherited one recessive form of the gene from each parent.
D) Jessica inherited one dominant gene from each parent.
Name _________________________
Date __________________ Per ____
10. Steven went to a farm and picked a bright red tomato from a broken branch on the plant. The tomato had a
rotten spot with a worm inside of it. Instead of eating the tomato, Steven decided to plant the seeds and grow new
tomato plants.
Which characteristic of the tomato plant is inherited and could change over several generations?
A) color of the skin
B) size of rotten spots
C) length of worms inside
D) number of broken branches
11. The figure below shows a Punnett Square for an inherited trait.
The arrow is pointing to a circled genotype in the square. What genotype does
the circled "dd" represent?
A) the genotype in the mother’s egg
B) the genotype that only the girls will inherit
C) the genotype that any of the children could inherit
D) the genotype that exactly ¼ of the children will inherit
12. The diagram below represents a cross between two pea plants.
In pea plants, the allele for round seeds (R) is dominant to the allele for oval seeds
(r). In a cross between the two plants above, what percentage of the offspring will have
round seeds?
A) 100%
B) 75%
C) 50%
D) 25%
13. In pigeons, the allele for normal feathers (F) is dominant to the allele for frizzy feathers (f).
If a purebred, normal-feathered bird (FF) is crossed with a frizzy-feathered bird (ff), how many different
feather phenotypes are possible in the offspring?
A) 1
B) 2
C) 3
D) 4
14. In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. What are the
possible combinations of genes in the offspring of two red-eyed heterozygous flies (Rr)?
A) RR only
B) rr only
C) Rr and rr only
D) RR, Rr and rr only
15. In Andalusian chickens, feather color is inherited by incomplete dominance. If one parent with black feathers
(BB) is crossed with a white-feathered parent (WW), all the offspring will have blue feathers (BW).
What is the percent chance of producing blue-feathered offspring when crossing a blue-feathered hen with
a white-feathered rooster?
A) 25%
B) 50%
C) 75%
D) 100%
Name _________________________
Date __________________ Per ____
16. In dogs, brown fur (B) is dominant to white fur (b). A dog has a litter of 12 puppies of which 6 are brown and 6
are white. Which of these Punnett squares shows the cross that occurred?
A)
B)
C)
D)
17. Use the information below to answer the following question(s).
In a species of fly, the allele for red eyes (R) is dominant to the allele for brown eyes (r). Red eye color in the flies
is not sex-linked. Students crossed male and female flies that had red eyes and recorded the eye color of their
offspring. Their data are shown below.
What are the most likely genotypes of the parent flies?
A) RR and rr
B) Rr and Rr
C) rr and rr
D) RR and Rr
18. Using the data in the table, what is the approximate ratio of red eyed offspring to brown eyed offspring?
A) 1:1
B) 2:1
C) 3:1
D) 4:1
19. Use the information and the Punnett square below to answer the following question(s).
In guinea pigs, the allele for black fur (B) is dominant. The allele for brown fur (b) is recessive. Two guinea pigs
were crossed as shown in the Punnett square below. Numbers 1,2,3, and 4 represent the types of offspring
produced from the cross.
What is the probability that an offspring from this cross would have brown fur?
A) 0%
B) 25%
C) 50%
D) 75%
Name _________________________
Date __________________ Per ____
20. In guinea pigs, the allele for black fur (B) is dominant. The allele for brown fur (b) is recessive. Two guinea
pigs were crossed as shown in the Punnett square below. Numbers 1,2,3 and 4 represent the types of offspring
produced from the cross.
Which of these describes the phenotypes of the parent guinea pigs?
A) Both parents have black fur
B) Both parents have brown fur
C) One parent has black fur, and the other has brown fur
D) One parent has a mixture of black and brown fur, and the other has black fur.
21. In pea plants, the trait for being tall (T) is dominant over the trait for being short (t). What is the expected
phenotypic outcome for the F1 generation in the cross shown below?
A) 100% short
C) 75% short
B) 50% tall
D) 100% tall
22. Students measured the change in height of a plant during a 25-day period. The graph below shows their data.
How many centimeters did the plant grow from Day
10 to Day 25?
A) 3 centimeters
B) 8 centimeters
C) 16 centimeters
D) 19 centimeters
23. A student has decided to investigate whether the number of flowers on a plant will increase if the water supply
to the plant is increased. She has five pots of geranium plants to use in her experiment.
What factor of the experiment should be varied for the five plants in order to answer the student's
question?
A) age of seedlings
B) temperature of water
C) volume of water
D) number of hours of sunlight
Name _________________________
Date __________________ Per ____
24. Students conducted an investigation to determine if mold grows on only certain types of bread. The students
dripped water on four types of bread and covered the damp bread with plastic wrap. Each piece of bread was
placed in a different dark area. The data table below shows the information the students collected after four days.
Which of these changes should the students make to
their investigation to develop a valid conclusion?
A) Use only two types of bread.
B) Drip more water on each piece of bread.
C) Keep all the bread at the same temperature.
D) Place some of the pieces of bread in a lighted area.
25. The distribution of chromosomes in one type of cell division is shown in the diagram below.
Which process and type of resulting cells are represented in the diagram?
A) mitosis, which produces body cells
B) mitosis, which produces gametes
C) meiosis, which produces body cells
D) meiosis, which produces gametes
Be sure to know the vocabulary below and examples of each with the alleles. See your Unit 4 Outcomes.
Recessive
Dominant
Heterozygous
Homozygous