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- 1. Multiple Choice
A pea plant that is heterozygous tall can produce short offspring when self-pollinating. Which of the following explains why this occurs?
independent assortment
segregation of alleles
polygenic expression
expresses codominance
- 2. Multiple Choice
A cross between two pea plants, each heterozygous for both tall height and round seeds, produces the following resulting plants: some are tall with round seeds, some are tall with wrinkled seeds, some are short with round seeds, and some are short with wrinkled seeds. Which of the following explains why this occurs?
independent assortment
codominance of traits
segreation of alleles
incomplete dominance
- 3. Multiple Choice
The gene for white-colored fruit is dominant over the gene for yellow-colored fruit. If homozygous yellow-fruited plants are crossed with heterozygous white-fruited plants, what is the expected percentage of fruit color produced in the offspring?
50% yellow, 50% white
25% yellow, 75% white
100% white
100 % yellow
- 4. Multiple Choice
feathered ( F ) is dominant over clean ( f ). If a hen's genotype is represented by ff , and a rooster's genotype is represented by Ff , what percentage of their offspring would be expected to have feathered shanks?
0%
25%
50%
75%
- 5. Multiple Choice
Which process increases inheritable variations
mitotic cell division
synthesis of proteins
recombination of genes
synthesis of proteins
- 6. Multiple Choice
In which pair of crosses must all of the offspring produced have the same phenotype?
Bb × bb and BB × Bb
BB × Bb and BB × bb
BB × BB and Bb × Bb
bb x bb and Bb × Bb
- 7. Multiple Choice
The locations of the alleles for eye color and wing shape are marked. What must be true about the gene for eye color?
It is independent of wing shape.
It is linked to wing shape
It is recessive to wing shape
It is dominant over wing shape
- 8. Multiple Choice
Colorblindness is a sex linked trait. A colorblind male marries a female with normal vision. The female’s father is also colorblind. What is the probability that their children will be colorblind
50% of their sons and 50% of their daughters will be colorblind
25% of their sons and 50% of their daughters will be colorblind
100% of their sons and 100% of their daughters will be colorblind
50% of their sons and 100% of their daughters will be colorblind
- 9. Multiple Choice
Human blood type is determined by multiple alleles (A, B, and O). Which phenotype would be expected for the offspring of a man with Type AB blood and a woman with Type O blood?
50% Type B, 50% Type O
50% Type A, 50% Type O
50% Type A, 50% Type B
50% Type AB, 50% Type O
- 10. Multiple Choice
Gregor Mendel crossed a purebred tall pea plant with a purebred short plant. All of the offspring were tall. Which of the following is correct?
Short is the dominant trait
tall is the recessive trait
short is the recessive trait
tall is codominant with the short trait
- 11. Multiple Choice
In the genetic condition known as Huntington’s disease, there is a dominant trait that affects the short arm of chromosome #4. A woman with Huntington’s disease and a normal, unaffected male have a female child. What is the likely probability that this child may be affected by the disease?
0
25
50
75
- 12. Multiple Choice
What is the proper term for an allele that is expressed over another allele it is paired with
codomninant
recessive
polygenic
dominant
- 13. Multiple Choice
A cross between a red flower and a white flower produces red and white spotted flowers. Which type of inheritance pattern is indicated by these results?
codominance
dominance
multiple allele
incomplete dominance
- 14. Multiple Choice
why is the statement "brown eyes are the best eyes" not a scientific statement?
it isnt true
it isnt testable or observable
there is no direct evidence of this
the term brown is not a term that we can define
- 15. Multiple Choice
Which best describes a scientific statement about genetics
a statement that explains why or how genes work
a statement about genetics that can be proven with eyewitness testimony
a statement that describes something about the nature of genetics
a statement about genetics that can be studied through observation, testing, and analysis
- 16. Multiple Choice
What is a scientific explanation which can be used to predict the probability that the offspring of certain individuals will have the genetic disorder of color-blindness
Color-blindness is relatively rare in females
Color-blindness tends to affect certain types of people
Color-blindness is caused by a sex-linked recessive allele
The expression of color-blindness is influenced by one’s environment
- 17. Multiple Choice
Gene B contains the code for an enzyme that cannot be synthesized unless gene A is active. Which statement best explains why this can occur?
heredity can be determined by more than just one gene (polygenic)
The first gene on each chromosome controls all the other genes on the chromosome
Genes are made up of double-stranded segments of DNA
All the genes on a chromosome act to ensure that an individual will have a single characteristic
- 18. Multiple Choice
How many offspring from this cross are likely to be homozygous for both petal color and plant height
6
12
4
2
- 19. Multiple Choice
A generation of plants has a phenotypic ratio of 9:3:3:1. Which of these identifies the process that explains the results of this cross?
independent assortment
crossing over
multiple alleles
gene flow
- 20. Multiple Choice
What is true of genes for two different traits that are located next to each other on the same chromosome?
they will be recombined
there are more likely to be inherited together
they will be codominant
they will be inherited seperately
- 21. Multiple Choice
what is the most likely mode of inheritance?
autosomal recessive
x linked recessive
xlinked dominant
autosomal codominant
- 22. Multiple ChoiceIn a heterozygous genotype, the ___________ allele takes over in the phenotype.recessivedominantlower case letterboth
- 23. Multiple ChoiceWhat type of heredity is shown in the pedigree?
(hint: check your notes - "modes of inheritance")Sex-Linked DominantSex-Linked RecessiveAutosomal DominantAutosomal Recessive - 24. Multiple ChoiceColor Blindness is a sex linked disease. Therefore, it HAS to affect which pair of chromosomes?2123241-22
- 25. Multiple ChoiceCrossing over is important because....It prevents mutations from entering the gametes.It allows for even distribution of chromosomes in the gametes.It allows for more genetic diversity of gametes.It allows for genetic uniformity of gametes.
- 26. Multiple ChoiceLinked genes arelocated on different chromosomes of the same size and shapelocated on the same chromosomerarely inherited together
- 27. Multiple ChoiceLaw of Segregation is when...alleles separate individually from each othergenes for each trait separate individually from each otherone allele masks the presence of another allelehomologous chromosomes pair with other genes
- 28. Multiple ChoiceWho is considered the "Father of Genetics?"James WatsonFrancis CrickGregor MendelAlbert Einstein
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