AP+Multiple+Choice+ch.20

++I realized that I hadn't put a link for the multiple choice I had just written it on the main page so I copied and pasted them on the new page and when I did that it deleted the last 9 problems. I did do them because I finished them in class on the lab day, it was just when I copied and pasted them the rest didn't paste. Question 1

Alternate forms of a gene having the same position on a pair of chromosomes and affecting the same trait are called. B) alleles

Question 2

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

Question 3

Genotype refers to an individual's: B) genes.

Question 4

If a person has both alleles for the dominant trait, his genotype is represented as: A) 2 capital letters.

Question 5

A heterozygous genotype is represented by: B) 1 capital letter and 1 lowercase letter.

Question 6

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

Question 7

Since homologous chromosomes are separated during meiosis, the gametes will have copy/copies of each allele. A) 1

Question 8

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

Question 9

Given the following notation - Ff. This represents: B) a genotype

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 phenotype ratio of _ is expected if a heterozygous genotype is crossed with a homozygous dominant genotype. D) 3:1

Question 11 Set up a Punnett square

A heterozygous brown bull mates with a white cow. (Brown is the dominant trait). What are the expected phenotype ratios? C) 50% brown and 50 % white

Question 12

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) Both parents are rr - homozygous recessive smooth

Question 13 Set up a Punnett square

Two heterozygous tall pea plants are cross-pollinated. What are the phenotype ratios of the offspring? B) 75% tall and 25% short (3:1)

Question 14

In reference to the previous question, what are the expected genotypes of the offspring? A) 25% TT, 50% Tt, 25% tt (1:2:1)

Question 15

An autosomal recessive disorder that usually occurs among Jewish people, where they lack the enzyme Hex A is called: B) Tay-Sachs disease

Question 16

Cystic fibrosis is due to the failure to pass through the plasma membrane which prevents soduim and water from passing through also A. Chloride ions

Question 17

An autosomal recessive disorder that affect nervous system development due to the lack of the enzymes needed for normal metabolism of phenylalanine is PKU

Question 18 AN autosomal dominant disorder that causes a defect in an elastic tissue protein called fibrillin is B. marfan syndrome

=Question 19=

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


 * || **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. ||

=Question 20=

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