NN+Ch.+20+multiple+choice

=Question 1=

Alternate forms of a gene having the same position on a pair of chromosomes and affecting the same trait are called__.__

B =Question 2=
 * || **A)** chromatids ||
 * || **B)** alleles ||
 * || **C)** DNA segments ||
 * || **D)** centrioles ||

People who appear normal but can pass on an allele for a genetic disorder are called.

D =Question 3=
 * || **A)** deficient ||
 * || **B)** recessive ||
 * || **C)** latent ||
 * || **D)** carriers ||

Genotype refers to an individual's:

B =Question 4=
 * || **A)** appearance ||
 * || **B)** genes. ||
 * || **C)** blood type. ||
 * || **D)** ear lobes. ||

If a person has both alleles for the dominant trait, his genotype is represented as:

A =Question 5=
 * || **A)** 2 capital letters. ||
 * || **B)** 1 capital and 1 lowercase letter ||
 * || **C)** 2 lowercase letters. ||

A heterozygous genotype is represented by:

B =Question 6=
 * || **A)** 2 capital letters. ||
 * || **B)** 1 capital letter and 1 lowercase letter. ||
 * || **C)** 2 lowercase letters. ||

Which of the following is not one of the 3 possible zygotes involving height?

C =Question 7=
 * || **A)** Tt ||
 * || **B)** tt ||
 * || **C)** Ts ||
 * || **D)** TT ||

Since homologous chromosomes are separated during meiosis, the gametes will have copy/copies of each allele.

A =Question 8=
 * || **A)** 1 ||
 * || **B)** 2 ||
 * || **C)** various ||
 * || **D)** no ||

Given a genotype of T T, what are the possible gametes?

A =Question 9=
 * || **A)** all are T ||
 * || **B)** all are T T ||
 * || **C)** half are T and half are t ||

Given the following notation - Ff. This represents:

B =Question 10= Set up a Punnett square of your choice of alleles. Example, cross a heterozygous tall pea plant with a homozygous dominant tall pea plant.
 * || **A)** a phenotype. ||
 * || **B)** a genotype ||
 * || **C)** a gamete. ||
 * || **D)** a gonad ||

A phenotype ratio of _ __is expected if a heterozygous genotype is crossed with a homozygous dominant genotype.__

D =Question 11= Set up a Punnett square
 * || **A)** 1:0 ||
 * || **B)** 1:1 ||
 * || **C)** 1 : 2: 1 ||
 * || **D)** 3:1 ||

A heterozygous brown bull mates with a white cow. (Brown is the dominant trait). What are the expected phenotype ratios?

C =Question 12=
 * || **A)** 100% brown ||
 * || **B)** 100% white ||
 * || **C)** 50% brown and 50 % white ||
 * || **D)** 50% brown and 50% tan ||

A rough coat of a guinea pig is dominant over a smooth coat. If 100% of the offspring are smooth coated, what are the genotypes and phenotypes of the parents?

C =Question 13= Set up a Punnett square
 * || **A)** RR - homozygous dominant rough and Rr - heterozygous rough ||
 * || **B)** Rr - heterozygous rough and rr homozygous recessive smooth ||
 * || **C)** Both parents are rr - homozygous recessive smooth ||
 * || **D)** RR - homonzygous dominant rough and rr - homozygous recessive smooth. ||

Two heterozygous tall pea plants are cross-pollinated. What are the phenotype ratios of the offspring?

B =Question 14=
 * || **A)** 50% tall and 50% short (1:1) ||
 * || **B)** 75% tall and 25% short (3:1) ||
 * || **C)** 25% tall and 75% short (1:3) ||
 * || **D)** 100% tall (1:0) ||

In reference to the previous question, what are the expected genotypes of the offspring?

A =Question 15=
 * || **A)** 25% TT, 50% Tt, 25% tt (1:2:1) ||
 * || **B)** 75% Tt, 25% tt (3:1) ||
 * || **C)** 50% TT, 25% Tt, 25%tt (2:1:1) ||
 * || **D)** 50 % TT, 50 %Tt (1:1) ||

An autosomal recessive disorder that usually occurs among Jewish people, where they lack the enzyme Hex A is called:

B =Question 16=
 * || **A)** cystic fibrosis ||
 * || **B)** Tay-Sachs disease ||
 * || **C)** Alagille syndrome ||
 * || **D)** Cri du chat ||

Cystic fibrosis is due to the failure of to pass through the plasma membrane which prevents sodium and water from passing through also.

A =Question 17=
 * || **A)** chloride ions ||
 * || **B)** mucus ||
 * || **C)** ATP ||
 * || **D)** hydrogen ions ||

An autosomal recessive disorder that affects nervous system development due to the lack of the enzyme needed for normal metabolism of phenylalanine is:

D =Question 18=
 * || **A)** Cri du chat ||
 * || **B)** Tay-Sachs disease ||
 * || **C)** Sickle-cell disease ||
 * || **D)** PKU (phenylketonuria) ||

An autosomal dominant disorder that causes a defect in an elastic tissue protein called fibrillin is:

B =Question 19=
 * || **A)** PKU ||
 * || **B)** Marfan syndrome. ||
 * || **C)** Huntington disease. ||
 * || **D)** Alagile syndrome. ||

Huntington disease is caused by a mutated protein called huntingtin that causes:

D =Question 20=
 * || **A)** multiple copies of glutamine in nerves. ||
 * || **B)** clumping of excess glutamine in nerves. ||
 * || **C)** progressive degeneration of brain cells. ||
 * || **D)** All of the above are correct. ||

Traits that involve more than 1 set of alleles are called _.

D =Question 21=
 * || **A)** codominant ||
 * || **B)** incomplete ||
 * || **C)** heterozygous ||
 * || **D)** polygenic ||

The crossing of a red 4 o'clock flower and a white 4 o'clock flower results in pink flowers. This is an example of:

C =Question 22=
 * || **A)** multifactorial inheritance ||
 * || **B)** co-dominance ||
 * || **C)** incomplete dominance ||
 * || **D)** a sex-linked trait. ||

__occurs when alleles are equally expressed in the heterozygote.__

C =Question 23=
 * || **A)** Co-dominance ||
 * || **B)** Sex-linking ||
 * || **C)** Incomplete dominance ||
 * || **D)** Continuous variation ||

Human blood type is determined from having 2 of __alleles.__

B =Question 24=
 * || **A)** 2 ||
 * || **B)** 3 ||
 * || **C)** 4 ||
 * || **D)** 5 ||

ABO alleles determine the presence or absence of __on the red blood cells.__

D =Question 25=
 * || **A)** antigens ||
 * || **B)** antibodies ||
 * || **C)** fragments ||
 * || **D)** ions ||

The following blood types are possible if parents have genotypes AO and BO.

D =Question 26=
 * || **A)** A ||
 * || **B)** B ||
 * || **C)** O ||
 * || **D)** All of these are correct. ||

A sex-linked trait is normally passed by the __to__ __.__

C =Question 27=
 * || **A)** father to son ||
 * || **B)** father to daughter ||
 * || **C)** mother to son ||
 * || **D)** mother to daughter ||

Duchenne muscular dystrophy is an X-linked recessive disorder caused by the lack of dystrophin which causes __to leak into muscles cells which then dissolve to be replaced by fibrous connective tissue.__

D =Question 28=
 * || **A)** huntingtin ||
 * || **B)** chloride ions. ||
 * || **C)** oxygen ||
 * || **D)** calcium ||

_ is called the bleeder's disease because the affected person's blood does not clot or clots very slowly.

A =Question 29=
 * || **A)** Hemophilia ||
 * || **B)** Huntington disease ||
 * || **C)** Sickle-cell disease ||
 * || **D)** None of the above. ||

Which of the following is NOT an X-linked recessive disorder?

C
 * || **A)** hemophilia ||
 * || **B)** Duchenne muscular dystrophy ||
 * || **C)** Huntington disease ||
 * || **D)** color-blindness ||