Biology Chapters 9 And 12

19 Questions | By Gabygarzaovalle | Last updated: Mar 20, 2022 | Total Attempts: 67

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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

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