Mastering Biology Chapter 14 Pre-Lecture Assignment

What is the genotype of the parent with orange eyes and white skin? (Note: orange eyes are recessive.) B=black eyes G=green skin b=orange eyes g=white skin a BbGg b bbGG c bbGg d bbgg e BBGG

Black eyes are dominant to orange eyes, and green skin is dominant to white skin. Sam, a MendAlien with black eyes and green skin, has a parent with orange eyes and white skin. Carole is a MendAlien with orange eyes and white skin. If Sam and Carole were to mate, the predicted phenotypic ratio of their offspring would be _____. a 3 black eyes, green skin : 3 black eyes, white skin : 9 orange eyes, green skin : 1 orange eyes, white skin b 9 black eyes, green skin : 3 black eyes, white skin : 3 orange eyes, green skin : 1 orange eyes, white skin c 1 black eyes, green skin : 1 black eyes, white skin : 1 orange eyes, green skin : 1 orange eyes, white skin d 1 black eyes, green skin : 3 black eyes, white skin : 3 orange eyes, green skin : 9 orange eyes, white skin e There is insufficient information to determine Sam's genotype.

In order to determine the genotype of a MendAlien with black eyes and green skin, you would cross this individual with a(n) _____ individual. B=black eyes G=green skin b=orange eyes g=white skin a BBgg b BBGG c bbgg d bbGG e BbGg

A cross between an individual with orange eyes and green skin and an individual with black eyes and white skin is an example of a _____ cross. B=black eyes G=green skin b=orange eyes g=white skin a dihybrid b trihybrid c test d difficult e monohybrid

A phenotypic ratio of 9:3:3:1 in the offspring of a cross indicates that _____. a one parent is homozygous dominant and one parent is heterozygous b one parent is homozygous dominant and one parent is homozygous recessive c one parent is heterozygous and one parent is homozygous recessive d both parents are homozygous dominant e both parents are heterozygous for both genes

The observed distribution of alleles into gametes is an illustration of _____. a Mendel's law of independent assortment only b Mendel's laws of segregation and independent assortment c Mendel's law of segregation only d Eimer's principle e Thienemann's rule

An individual heterozygous for eye color, skin color, and number of eyes mates with an individual who is homozygous recessive for all three characters; what would be the expected phenotypic ratio of their offspring? [Hint: B = black eyes, b = orange eyes; G = green skin, g = white skin; C = two eyes, c = one eye] a 1 black eyes, green skin, two eyes : 1 black eyes, green skin, one eye : 1 black eyes, white skin, two eyes : 1 orange eyes, green skin, two eyes : 1 orange eyes, white skin, two eyes : 1 orange eyes, white skin, one eye b 9 orange eyes, green skin, two eyes : 9 orange eyes, green skin, one eye : 9 orange eyes, white skin, two eyes : 1 orange eyes, white skin, one eye c 1 black eyes, green skin, two eyes : 1 black eyes, green skin, one eye : 1 black eyes, white skin, two eyes : 1 black eyes, white skin, one eye : 1 orange eyes, green skin, two eyes : 1 orange eyes, green skin, one eye : 1 orange eyes, white skin, two eyes : 1 orange eyes, white skin, one eye d 9 black eyes, green skin, two eyes : 3 black eyes, green skin, one eye : 3 black eyes, white skin, two eyes : 1 black eyes, white skin, one eye e 9 black eyes, green skin, two eyes : 3 black eyes, green skin, one eye : 3 black eyes, white skin, two eyes : 1 black eyes, white skin, one eye : 9 orange eyes, green skin, two eyes : 3 orange eyes, green skin, one eye : 3 orange eyes, white skin, two eyes : 1 orange eyes, white skin, one eye

A BbGg x bbgg cross yields a phenotypic ratio of approximately 5 black eyes, green skin : 5 orange eyes, white skin : 1 black eyes, white skin : 1 orange eyes, green skin. Which of the following best explains these results? a Mendel's laws of segregation and independent assortment are being violated. b The genes for eye color and skin color are co-dominant. c Mendel's law of segregation is being violated. d Mendel's law of independent assortment is being violated. e The heterozygous individual is male, and the homozygous individual is female.

In the following cross the genotype of the female parent is BbGg. What is the genotype of the male parent? [Hint: B = black eyes, b = orange eyes, G = green skin, g = white skin] B=black eyes G=green skin b=orange eyes g=white skin a BbGg b bbGG c BBGG d BbGG e BBGg

In a situation in which genes assort independently, what is the ratio of the gametes produced by an AaBB individual? In a situation in which genes assort independently, what is the ratio of the gametes produced by an AaBB individual? a 1 AB : 1 aB b 1 A : 1 B c 3 A : 1 B d 3 AA : 1 BB e 3 AB : 1 ab

What is the difference between heterozygous and homozygous individuals? a The homozygote will express the dominant trait and the heterozygote will express the recessive trait. b Homozygotes have one chromosome while heterozygotes have two similar chromosomes. c Heterozygotes carry two copies of a gene while homozygotes only carry one. d All of the gametes from a homozygote carry the same version of the gene while those of a heterozygote will differ.

When constructing a Punnett square, the symbols on the outside of the boxes represent _______, while those inside the boxes represent _______. a parents, gametes b progeny, gametes c gametes, parents d gametes, progeny

True or false? The same phenotype can be produced by more than one genotype. True False

True or false? In diploid organisms, a dominant phenotype will only be expressed if the individual is homozygous dominant for that trait. True False

If an organism with the genotype AaBb produces gametes, what proportion of the gametes would be Bb? a None b 1/4 c 3/4 d 1/2

Two mice are heterozygous for albinism (Aa) . The dominant allele (A) codes for normal pigmentation, and the recessive allele (a) codes for no pigmentation. What percentage of their offspring would have an albino phenotype? a 50 b 100 c 25 d 75

A tall, purple-flowered pea plant (TtPp) is allowed to self-pollinate. (The recessive alleles code for short plants and white flowers.) The phenotypic ratio of the resulting offspring is 9:3:3:1. What is the genotype of the plant whose phenotype appeared once out of every 16 offspring (the "1" in the 9:3:3:1 ratio)? a TtPp b TTPP c ttpp d TTpp

What process is responsible for the independent assortment of alleles? a Mitosis b Meiosis. c Cytokinesis. d DNA replication.

How do cells acquire homologous chromosome pairs that carry the alleles that are independently assorted? a DNA replication b Meiosis c Mitosis d Fusion of gametes

Which of the following statements most accurately describes the process of independent assortment? a Alleles found on separate chromosomes segregate based upon their origin. b Alleles of different genes segregate from one another in a random manner. c Dominant alleles segregate with recessive alleles. d Genes located on the same chromosome assort as an independent unit.

True or false? The principle of independent assortment is best illustrated by events that take place during metaphase II, during which sister chromatids segregate independently of each other. True False

How many genetically unique types of gametes could be produced by an individual with the genotype RrYY? a Eight b One c Two d Three

Which of the following parental genotypes would yield a 1:1:1:1 phenotypic ratio in the offspring? a aaBb, AaBb b aaBb, aabb c AaBb, AaBb d AaBb, aabb

Mendel worked _____. a on problems involving characters that were inherited together more often than expected by chance b with fruit flies c in a monastery d on gene mapping e on the Human Genome Project