Unit 3 Test: Rebate

20 Questions | By MrMackRH | Updated: Mar 21, 2022 | Attempts: 72

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1.

A plant that is homozygous for red flowers (rr) is crossed with a plants that is homozygous for white flowers (ww). In the case of incomplete dominance, the flowers of the offspring will be ___.
- A.
  
  Red and white
- B.
  
  White only
- C.
  
  Red only
- D.
  
  Pink only
2.

An allele is dominant in a heterozygote when it is
- A.
  
  Expressed and the other allele is not.
- B.
  
  A very common allele in the population.
- C.
  
  The weaker of the two alleles.
- D.
  
  More desirable than the other allele.
3.

Which law states that organisms inherit two copies of each gene and donate one copy to each of their offspring?
- A.
  
  Law of genetic linkage
- B.
  
  Law of segregation
- C.
  
  Law of independent assortment
- D.
  
  Law of inheritance
4.

Mendel's second law of genetics, the law of independent assortment, is one explanation of the
- A.
  
  Random fertilization of gametes.
- B.
  
  Genetic variation within species.
- C.
  
  Greater strength of dominant alleles.
- D.
  
  Final stages of gametogenesis.
5.

For an XX female to express a recessive sex-linked trait, she must have
- A.
  
  A Y chromosome.
- B.
  
  An inactivated allele.
- C.
  
  Two recessive alleles.
- D.
  
  Two dominant alleles.
6.

A child is born with attached earlobes, which is a recessive phenotype. Which of the following genotypes could the parents have?
- A.
  
  RR and RR
- B.
  
  Rr and RR
- C.
  
  Rr and rr
- D.
  
  RR and rr
7.

Any of the alternative forms of a gene that occurs at a specific place on a chromosome are known as ___.
- A.
  
  Alleles
- B.
  
  Genes
- C.
  
  Chromosomes
- D.
  
  Recessive traits
8.

___ studied traits of pea plants and discovered the two fundamental laws of genetics.
- A.
  
  Mendel
- B.
  
  Watson and Crick
- C.
  
  Mack
- D.
  
  Einstein
9.

In humans, a ___ cell has ___ chromosomes.
- A.
  
  Haploid ... 46
- B.
  
  Haploid ... 23
- C.
  
  Diploid ... 50
- D.
  
  Diploid ... 23
10.

Homologous chromosomes exchange information from time to time through a process called crossing over. During which stage of meiosis does this occur?
- A.
  
  Prophase I
- B.
  
  Metaphase II
- C.
  
  Prophase II
- D.
  
  Telophase I
11.

The cells in the ovaries and testes that actually go through meiosis to produce haploid cells are called ___.
- A.
  
  Germ cells
- B.
  
  Oocytes
- C.
  
  Spermatocytes
- D.
  
  Gametes
12.

A form of nuclear division that divides a diploid cell into haploid cells and produces gametes is known as ___.
- A.
  
  Mitosis
- B.
  
  Meiosis
- C.
  
  Cellular regeneration
- D.
  
  Binary fission
13.

A female gamete ___.
- A.
  
  Is produced in the testes.
- B.
  
  Is called an ovum or an egg cell.
- C.
  
  Is called a spermatocyte.
- D.
  
  Is called a polar body.
14.

Cells that have only one copy of an organisms chromosomes are said to be ___.
- A.
  
  Somatic cells
- B.
  
  Diploid cells
- C.
  
  Haploid cells
- D.
  
  Binary cells
15.

Cells that are produced by germ cells through the process of meiosis are called ___.
- A.
  
  Somatic cells
- B.
  
  Gametes
- C.
  
  Diploid cells
- D.
  
  Binary cells
16.

Messenger RNA is formed in the process of ___.
- A.
  
  Transcription
- B.
  
  Translation
- C.
  
  Replication
- D.
  
  Mutation
17.

Watson and Crick, with the help of Rosalind Franklin, were the first to suggest that DNA is ___.
- A.
  
  A short molecule
- B.
  
  A protein molecule
- C.
  
  The shape of a double helix
- D.
  
  The genetic material
18.

Which of the following statements about DNA and RNA is true?
- A.
  
  RNA is arranged in a double helix.
- B.
  
  The kinds of sugar in the nucleotides of DNA and RNA differ.
- C.
  
  DNA contains nitrogenous bases and phosphates, while RNA does not.
- D.
  
  DNA contains uracil, while RNA contains thymine.
19.

What does the circle represent in this diagram of a nucleotide?
- A.
  
  Phosphate group
- B.
  
  Nitrogenous base
- C.
  
  Pentose sugar
- D.
  
  Adenine base
20.

Which of the following is a pair of complementary bases?
- A.
  
  Cytosine and cytosine
- B.
  
  Thymine and adenine
- C.
  
  Adenine and guanine
- D.
  
  Thymine and ctyosine