BIOL 1408 Lecture 11 Quiz

Attached ear lobe is a dominant trait. Cross two heterozygous parents for ear lobe attachment (Ee X Ee). What is the expected phenotypic ratio ?(How many offsprings will have attached earlobe and how many will not) a. 3:1 b. None of the above c. 2:1 d. 1:1

a. 3:1

____________ traits are those that are expressed in the offspring. a. Dominant b. Recessive c. Latent d. none of the above

a. Dominant

The discoverer of the laws of genetics was: a. Gregor Mendel b. Jean Lamarck c. James Watson d. Charles Darwin

a. Gregor Mendel

The device used in genetics to determine the probable genotype and phenotype of a particular cross is called a: a. Punnett square b. None of the above c. Dihybrid cross d. Rubics cube e. Gene matrix

a. Punnett square

Which of these is homozygous? a. both AA and aa b. aa c. all of the above d. AA e. Bb

a. both AA and aa

The allele which is traditionally indicated by an uppercase (capital) letter is the: a. dominant allele b. somatic allele c. genotypic allele d. recessive allele

a. dominant allele

Codominance is exhibited in: a. Polydactyly b. blood types c. Body height d. Phenylketonuria

b. blood types

Gregor Mendel used ____________ as his model for inheritance in his famous genetic experiments: a. Fruit flies b. pea plants c. tomato plants d. mice

b. pea plants

Tall pea plants are dominant over short pea plants. If a heterozygous tall pea plant(Tt) is crossed with a short pea plant(tt), what percentage of the offspring will be homozygous dominant? a. 25% b. 100% c.term-24 0% d. 50%

c. 0%

Brown eyes are dominant over blue eyes. If a woman with a dominant brown eyes ,(homozygous) reproduces with a man with recessive blue eyes , what is the chance they will have a child with brown eyes? a. 0% b. 25% c. 100% d. 50%

c. 100%

In crossing two heterozygous parents, what are the chances for a homozygous recessive offspring? a. 75% b. 50% c. 25% d. Less than 10% e. None of the above

c. 25%

Which of the following genotypes show dominant phenotypes? a. AA and aa b. AA c. Aa and AA d. aa e. Aa

c. Aa and AA

If tall (T) is dominant over short (t), the offspring of the cross TT with tt will a. Display the same phenotype as the tt parent b. Have the same genotype as the TT parent c. Display the same phenotype as the TT parent d. Be homozygous

c. Display the same phenotype as the TT parent

Choose the letter designation that represents homozygous recessive genotype. a. EE c. ee b. Ee d. None of the above

c. ee

When conducting a testcross, an individual of unknown genotype showing a dominant phenotype is always crossed with a: a. hybrid individual b. heterozygous individual c. homozygous recessive individual d. homozygous dominant individual

c. homozygous recessive individual

Which of these indicates a recessive allele? a. underlined letters b. italicized letters c. lowercase letters d. CAPITAL LETTERS

c. lowercase letters

Observable traits of an organism are referred to as its ______________ while the genetic makeup is called its ____________. a. dominant, recessive b. genotype, phenotype c. phenotype, genotype d. appearance, alleles

c. phenotype, genotype

Traits that disappear in offspring are a. called b. dominant c. recessive d. expressed e. none of the above

c. recessive

Tall pea plants are dominant over short pea plants. If a heterozygous tall pea plant(Tt) is crossed with a short pea plant(tt), what percentage of the offspring will be homozygous dominant? a. 50% b. 25% c. 100% d. 0%

d. 0%

If all the offspring of a cross have the genotype Tt, the parents would most likely be: a. Tt x Tt b. tt x tt c. Tt x tt d. TT x tt

d. TT x tt

A uppercase letter and a lowercase letter(example: A and a) in genetics problems represent: a. Disjunctive and separate genes b. Characteristic phenotype of an individual c. Chromosomal mutations d. Two different alleles for a trait

d. Two different alleles for a trait

The gene variants that exist on the same relative locations on a pair of homologous chromosomes are called a. chromatids b. autosomes c. loci d. alleles e. chiasmata

d. alleles

In crossing a heterozygous parent(Yy) and a homozygous(yy) recessive parent, what is the percentage of chances that an offspring will receive dominant allele? a. None of the above b. 25% c. 75% d. Less than 10% e. 50%

e. 50%

In crossing two heterozygous parents, what are the chances that an offspring will receive a dominant allele? a. 25% b. 50% c. None of the above d. Less than 10% e. 75%

e. 75%

In pea plants, purple flower color (P) is dominant over white (p), and tall plants (T) are dominant over short (t). If a white short plant is crossed with a purple and tall plant, and all the offspring from several crosses are only purple and tall, the genotype of the purple tall plant is: a. none of the above b. PPTt c. PpTt d. PpTT e. PPTT

e. PPTT