Biology Chapters 9 And 12
- 1.Mendel obtained plants that were true- breeding for particular traits by
- A.
Growing plants from the seeds of others plants that showed that trait
- B.
Discarding plants that showed others traits
- C.
Allowing plants to self- pollinate for several generations
- D.
Allowing plants to cross- pollinate for one generation
- 2.When Mendel crossed a strain of tall pea plants with a strain of short pea plants, he observed that all of the plants in the F1 generation were tall. This suggests that
- A.
The tall trait was controlled by a dominant factor
- B.
The short trait was controlled by a dominant factor
- C.
Both traits were controlled by a recessive factor
- D.
The strain of short plants was not capable of pollinating the strain of tall plants
- 3.A cross between true- breeding green- podded pea plants and true- breeding yellow- podded pea plants produces only green- podded plants. When the F1 generation is allowed to self pollinate, the F2 generation consists of
- A.
Only green- podded plants
- B.
Only yellow- podded plants
- C.
About three quarters yellow- podded plants and one quarter green podded plants
- D.
About three quarters green- podded plants and one quarter yellow- podded plants
- 4.When alleles for different characteristics are one separate chromosomes, they are distributed to gametes independently. This obersvation is summarized by the law of
- A.
Cross- pollination
- B.
Independent assortment
- C.
Segregation
- D.
Molecular genetics
- 5.The appearance of an organism is its
- A.
Genotype
- B.
Phenotype
- C.
Genotypic ratio
- D.
Phenotypic ratio
- 6.A genetic crossed performed many times produces 798 long- stemmed plants amd 266 short- stemmed plants. The probability of obtaining a short- stemmed plant in a similar cross is
- A.
266/ 1, 064.
- B.
266/ 798
- C.
798/ 266
- D.
798/ 1, 064.
- 7.A monohybrid cross of two individuals that are heterozygous for a trait exhibiting complete dominance would probably result in a phenotypic ratio of
- A.
4 dominant: 0 recessive
- B.
1 dominant: 3 recessive
- C.
3 dominant: 1 recessive
- D.
1 dominant: 1 recessive
- 8.To determine the genotype of an individual that shows the dominant phenotype, you would cross that individual with one that is
- A.
Heterozygous dominant
- B.
Heterozygous recessive
- C.
Homozygous dominant
- D.
Homozygous recessive
- 9.In a dihybrid cross between an individual with the genotype RRYY and an individual with the genotype rryy, all of the offspring will have the genotype
- A.
RRYY
- B.
RrYY
- C.
RrYy
- D.
Rryy
- 10.Genes that belong to the same linkage group tend to be
- A.
Located on different chromosomes
- B.
Inherited together
- C.
Found only in males
- D.
Found only in somatic cells
- 11.Two genes that are one map unit apart are separated by crossing- over
- A.
1% of the time
- B.
20% of the time
- C.
50% of the time
- D.
100% of the time
- 12.Mutations that can be inherited arise in
- A.
Somatic cells
- B.
Body cells
- C.
Germ cells
- D.
Skin cells
- 13.Which of the following sequences could result from an inversion of the sequence GAGACATT?
- A.
GAGCATT
- B.
GTGACATT
- C.
CTCTGATT
- D.
GATACAGT
- 14.Which of the following is a point mutation that does not produce a frameshift?
- A.
Substitution
- B.
Insertion
- C.
Deletion
- D.
Inversion
- 15.Which individual (s) in the pedigree shown below must be a carrier?
- A.
1 only
- B.
4 only
- C.
3 only
- D.
Both 1 and 4
- 16.Since the ABO blood group alleles are codominant, an individual with the genotype IAIB will have blood type
- A.
A
- B.
B
- C.
AB
- D.
O
- 17.Which of the following human traits is not a polygenic trait?
- A.
Skin color
- B.
Eye color
- C.
Height
- D.
ABO blood type
- 18.A trait whose expression is affected by the presence of sex hormones is said to be
- A.
Sex- influenced
- B.
Sex- linked
- C.
X- linked
- D.
Y- linked
- 19.In humans, PKU can be treated by
- A.
Insulin injections
- B.
Diet
- C.
Gene therapy
- D.
Surgery
Questions: 9 | Attempts: 46662 | Last updated: Oct 6, 2020
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Sample QuestionA Cell builds it's proteins from the Instructions encoded inits _________?
Questions: 28 | Attempts: 13792 | Last updated: May 12, 2021
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Sample QuestionII-3 in the pedigree below has two brothers with hemophilia A, a bleeding disorder that is inherited as an X‑linked recessive trait. What is the risk of hemophilia for her children?
Questions: 5 | Attempts: 14098 | Last updated: Jun 12, 2020
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Sample QuestionMendel observed 7 pairs of contrasting characters in Pisum sativum. One of the following is not a part of that. Find out.
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