Genetics Trivia Questions Test! Toughest Quiz

50 Questions | By RG8673 | Updated: Mar 21, 2022 | Attempts: 58

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Genetics Trivia Questions Test! Toughest Quiz - Quiz

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1.

Offspring that result from crosses between true-breeding parents with different traits
- A.
  
  Are true-breeding.
- B.
  
  Make up the F2 generation.
- C.
  
  Make up the parental generation.
- D.
  
  Are called hybrids
2.

The chemical factors that determine traits are called
- A.
  
  Alleles
- B.
  
  Traits
- C.
  
  Genes
- D.
  
  Characters
3.

Gregor Mendel concluded that traits are
- A.
  
  Not inherited by offspring.
- B.
  
  Inherited through the passing of factors from parents to offspring.
- C.
  
  Determined by dominant factors only.
- D.
  
  Determined by recessive factors only.
4.

When Gregor Mendel crossed a tall plant with a short plant, the F₁ plants inherited
- A.
  
  An allele for tallness from each parent.
- B.
  
  An allele for tallness from the tall parent and an allele for shortness from the short parent.
- C.
  
  An allele for shortness from each parent.
- D.
  
  An allele from only the tall parent.
5.

The principle of dominance states that
- A.
  
  All alleles are dominant.
- B.
  
  All alleles are recessive.
- C.
  
  Some alleles are dominant and others are recessive.
- D.
  
  Alleles are neither dominant nor recessive.
6.

When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, all the offspring were tall because
- A.
  
  The allele for tall plants is recessive.
- B.
  
  The allele for short plants is dominant.
- C.
  
  The allele for tall plants is dominant.
- D.
  
  They were true-breeding like their parents.
7.

A tall plant is crossed with a short plant. If the tall F₁ pea plants are allowed to self-pollinate,
- A.
  
  The offspring will be of medium height.
- B.
  
  All of the offspring will be tall.
- C.
  
  All of the offspring will be short.
- D.
  
  Some of the offspring will be tall, and some will be short.
8.

The principles of probability can be used to
- A.
  
  Predict the traits of the offspring produced by genetic crosses.
- B.
  
  Determine the actual outcomes of genetic crosses.
- C.
  
  Predict the traits of the parents used in genetic crosses.
- D.
  
  Decide which organisms are best to use in genetic crosses.
9.

In the P generation, a tall plant is crossed with a short plant. The probability that an F₂ plant will be tall is
- A.
  
  50%
- B.
  
  75%
- C.
  
  25%
- D.
  
  100%
10.

Organisms that have two identical alleles for a particular trait are said to be
- A.
  
  Hybrid
- B.
  
  Homozygous
- C.
  
  Heterozygous
- D.
  
  Dominant
11.

In the Punnett square shown in Figure 11-1, which of the following is true about the offspring resulting from the cross? (Tt x TT)
- A.
  
  About half are expected to be short.
- B.
  
  All are expected to be short.
- C.
  
  About half are expected to be tall.
- D.
  
  All are expected to be tall.
12.

The genotypic ratio of the offspring in Figure 11-1 is:
- A.
  
  2TT:2Tt
- B.
  
  1TT:2Tt:1tt
- C.
  
  2tall:2short
- D.
  
  3tall:1short
13.

The phenotypic ratio of the offspring in Figure 11-1 is:
- A.
  
  2TT:2Tt
- B.
  
  2tall:2short
- C.
  
  1TT:2Tt:1tt
- D.
  
  4 tall
14.

A Punnett square shows all of the following EXCEPT
- A.
  
  All possible results of a genetic cross.
- B.
  
  The genotypes of the offspring.
- C.
  
  The alleles in the gametes of each parent.
- D.
  
  The actual results of a genetic cross.
15.

If you made a Punnett square showing Gregor Mendel’s cross between true-breeding tall plants and true-breeding short plants, the square would show that the offspring had
- A.
  
  The genotype of one of the parents.
- B.
  
  A phenotype that was different from that of both parents.
- C.
  
  A genotype that was different from that of both parents.
- D.
  
  The genotype of both parents.
16.

What principle states that during gamete formation genes for different traits separate without influencing each other’s inheritance?
- A.
  
  Principle of dominance
- B.
  
  Principle of independent assortment
- C.
  
  Principle of probabilities
- D.
  
  Principle of segregation
17.

How many different allele combinations would be found in the gametes produced by a pea plant whose genotype was RrYY?
- A.
  
  2
- B.
  
  4
- C.
  
  8
- D.
  
  16
18.

If a pea plant that is heterozygous for round, yellow peas (RrYy) is crossed with a pea plant that is homozygous for round peas but heterozygous for yellow peas (RRYy), how many different phenotypes are their offspring expected to show?
- A.
  
  2
- B.
  
  4
- C.
  
  8
- D.
  
  16
19.

Situations in which one allele for a gene is not completely dominant over another allele for that gene are called
- A.
  
  Multiple alleles.
- B.
  
  Incomplete dominance.
- C.
  
  Polygenic inheritance.
- D.
  
  Multiple genes.
20.

A cross of a red cow (RR) with a white bull (WW) produces all roan offspring (RRWW). This type of inheritance is known as
- A.
  
  Incomplete dominance.
- B.
  
  Polygenic inheritance.
- C.
  
  Codominance.
- D.
  
  Multiple alleles.
21.

The number of chromosomes in a gamete is represented by the symbol
- A.
  
  Z
- B.
  
  X
- C.
  
  N
- D.
  
  Y
22.

If an organism’s diploid number is 12, its haploid number is
- A.
  
  12.
- B.
  
  6
- C.
  
  24.
- D.
  
  3.
23.

Gametes have
- A.
  
  Homologous chromosomes.
- B.
  
  Twice the number of chromosomes found in body cells.
- C.
  
  Two sets of chromosomes.
- D.
  
  One allele for each gene.
24.

Gametes are produced by the process of
- A.
  
  Mitosis.
- B.
  
  Meiosis.
- C.
  
  Crossing-over.
- D.
  
  Replication.
25.

What is shown in Figure 11-3? (Figure 11-16 in your book)
- A.
  
  Independent assortment
- B.
  
  Anaphase I of meiosis
- C.
  
  Crossing-over
- D.
  
  Replication