6.1/6.2
6.3/6.4
6.5
7.1/7.2
Random
100
When an organism has two alleles at a particular locus that are different, the organism is called a. purebred. b. dominant. c. heterozygous. d. recessive.
c. heterozygous.
100
A distinguishing characteristic that can be inherited is a(n) a. cross. b. allele. c. gene. d. trait.
d. trait.
100
What do the letters inside the grid of a Punnett square represent? a. phenotypes of parents b. genotypes of offspring c. testcrosses of offspring d. chromosomes of parents
b. genotypes of offspring
100
A person who is heterozygous for a disorder caused by recessive alleles is a carrier of the disorder. A carrier is a person who a. does not have the disorder but can pass it on to offspring. b. can develop the disorder later in life but cannot pass it on. c. has a dominant normal allele that has been inactivated. d. passes the disorder to offspring on the Y chromosome only.
What is a. does not have the disorder but can pass it on to offspring.
100
Eye color, hair color, and skin color are polygenic traits. Polygenic traits result from a. recessive genes. b. many genes. c. codominant genes. d. epistatic genes.
What is b. many genes.
200
Which of the following best describes the genetic material a person receives from his or her father? a. 22 pairs of homologous chromosomes and an X and Y chromosome b. 22 haploid cells and an X or Y chromosome c. 23 diploid cells and an X and Y chromosome d. 22 autosomes and an X or Y chromosome
What is d. 22 autosomes and an X or Y chromosome
200
Which phrase best describes the term genome? a. the genetic makeup of a chromosome b. the genes that make up an organism c. the location of a specific set of genes d. the sum of an organism's physical traits
b. the genes that make up an organism
200
What is the probability that the offspring of a cross between a homozygous recessive parent and a heterozygous parent will be homozygous recessive? a. 1/1 b. 1/2 c. 1/4 d. 1/8
What is b. 1/2
200
Genes that are located on sex chromosomes are called a. alleles. b. recessive. c. XY. d. sex-linked.
What is d. sex-linked.
200
A chart that traces the phenotypes and genotypes within a family is called a a. pedigree. b. karyotype. c. Punnett square. d. chromosome map.
What is a. pedigree.
300
During what stage of meiosis does crossing over occur? a. prophase I of meiosis I b. anaphase II of meiosis II c. telophase I of meiosis I d. metaphase II of meiosis II
a. prophase I of meiosis I
300
Which of the following conclusions was a result of Mendel's observations? a.Organisms that give rise to purebreds are genetically superior. b.Organisms that have intermediate features are self-pollinating. c.Organisms inherit two copies of each gene, one from each parent. d.Organisms that self-pollinate do not have "either-or" features.
What is c.Organisms inherit two copies of each gene, one from each parent.
300
What is the phenotypic ratio of a monohybrid cross between two heterozygous parents? a. 3:1 b. 1:2:1 c. 9:3:3:1 d. 1:2:2:1
What is a. 3:1
300
Hemophilia is a sex-linked, recessive trait. Which of the following describes the probability of hemophilia in the offspring of a man who does have hemophilia and a woman whose is a carrier of hemophilia? a. There is a 50% chance that their daughters will have hemophilia. b. None of their daughters will have hemophilia. c. Their sons have a 25% chance of having hemophilia. d. Each of their sons will have hemophilia.
What is a. There is a 50% chance that their daughters will have hemophilia.
300
What is the main reason that sex-linked disorders are most often observed in males? a. The X chromosome only has genes for genetic disorders. b. The Y chromosome cannot have genes that cause genetic disorders. c. The Y chromosome cannot mask alleles on the X chromosome. d. The X chromosome has genes only for sex determination.
What is c. The Y chromosome cannot mask alleles on the X chromosome.
400
Which of the following cell types is diploid? a. ovum b. sex cell c. somatic cell d. gamete
What is c. somatic cell
400
Hair color and eye color are examples of a person's a. recessive traits. b. dominant alleles. c. genotype. d. phenotype.
What is d. phenotype.
400
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.
What is b. genetic variation within species.
400
A plant that is homozygous for red flowers is crossed with a plant that is homozygous for white flowers. In the case of incomplete dominance, the flowers of the offspring will be a. red and white. b. white only. c. pink only. d. red only.
What is c. pink only.
400
Mitosis and meiosis are processes involved in cellular reproduction. Which of the following describes and event that results from mitosis but NOT meiosis? a. two stages of cell division b. replication of cellular genetic material c. daughter cells that are identical to the parent cell d. four daughter cells that are produced from each parent cell
c. daughter cells that are identical to the parent cell
500
Which of the following phrases best describes the function of meiosis? a. conserves chromosome number, produces genetically identical cells b. conserves chromosome number, produces haploid cells c. reduces chromosome number by half, produces diploid cells d. reduces chromosome number by half, produces gametes
What is d. reduces chromosome number by half, produces gametes
500
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
What is b. law of segregation
500
Cystic fibrosis is a hereditary disease that affects the respiratory and digestive systems. Cystic fibrosis occurs when two recessive genes (cc) are present. A person with one allele for cystic fibrosis is called a carrier (Cc) of the disease. If the mother is a carrier of the disease and the father is homozygous dominant, what are the chances that their first child will be a carrier of cystic fibrosis? a. 25% b. 75% c. 50% d. 100%
What is c. 50%
500
In the case of codominant alleles, a plant that is homozygous for red flowers that is crossed with a plant that is homozygous for white flowers will produce flowers that are a. red and white spotted. b. completely white. c. dark pink all over. d. pink and red.
What is a. red and white spotted.
500
Two parents have the genotype Gg for a genetic disorder caused by a dominant allele. What is the chance that any of their children will inherit the disorder? a. 25% b. 50% c. 75% d. 100%
What is c. 75%
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