Ch 14

Question 1

Pea plants were particularly well suited for Mendel’s experiments for all of the following reasons except

Answer 1

D) Peas have an unusually long generation time

Question 2

What is the difference btw a monhybrid and a dyhybrid cross?

Answer 2

C) dyhybrid involves organisms that are heterozygous for two characters

Question 3

A cross btw a homozygous purple flower and homozygous white flowered pea plants results in offspring with purple. This demonstrates

Answer 3

C) dominance

Question 4

The F1 offspring of Mendel’s classic pea cross always looked like one of the two parental varieties because

Answer 4

A) one phenotype was completely dominant over another

Question 5

What was the most significant conclusion that Mendel drew from his experiments with pea plants?

Answer 5

B) Traits are inherited in discrete units and aren’t blending

Question 6

How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?

Answer 6

B) 8

Question 7

Two plants are crossed, resulting in offspring with a 3;1 ratio for a particular trait. This suggests

Answer 7

D) The parent were both heterozygous.

Question 8

Two characters that appear in a 9;;3;3;1 in the F2 generation should have which of the following properties?

Answer 8

B) The genes controlling the characters obey the law of independent assortment.

Question 9

A animal with H for head shape and T for tail length. Which is a possible gamete for this organism?

Answer 9

A) HT

Question 10

It was important that Mendel examined not just the F1 gen but the F2 as well because

Answer 10

B) parental traits that were not observed in the F1 reappeared in F2

Question 11

Mendel accounted for the observation that traits had disappeared in the F1 gen reappeared in the F2 by proposing that

Answer 11

C) traits can be dominant or recessive

Question 12

Which of the following statements of law of segregation is false?

Answer 12

E) It is a method that can be used to determine the number of chromosomes in a plant.

Question 13

The fact that all seven of the pea plant traits studied by Mendel obeyed the principle of independent assortment most probably indicates which of the following?

Answer 13

D) All of the genes controlling the traits behaved as if they were on different chromosomes

Question 14

Mendel was able to draw his ideas of segregation and independent assortment because of the influence of which of the following?

Answer 14

E) His experiments with the breeding of plants such as peas

Question 15

Mendels observation of the segregation of alleles in gamete formation as it’s basis in which of the following phases of cell division?

Answer 15

D) anaphase one of meiosis

Question 16

Minnows second law of independent assortment as it’s basis and which of the following events of meiosis I?

Answer 16

C) alignment of tetrads at the equator

Question 17

Black fur and mice (B) is dominant to brown fur(b). Short tails (T) are dominant to long tails (t). What fraction of the progeny of of the cross BbTtxBBtt will have black for and long tails?

Answer 17

D) 1/2

Question 18

In certain plants, tall is dominant too short. If the heterozygous plant is closed with a homozygous tall plant, what is the probability that the offspring will be short?

Answer 18

B) 1/2

Question 19

Two true-breeding stocks of people plants are crossed. One parent has red, axial flowers and the other has white, terminal flowers; all F1 individuals have read, ask your flowers. The jeans for flower color and location of sort independently. If 1000 F2 offspring resulted from the cross, approximately how many of them would you expect to have read, terminal flowers?

Answer 19

B) 190

Question 20

And a cross AaBbCcxAaBbCc, What is the probability of producing the genotype AABBCC?

Answer 20

E) 1/64

Question 21

Given parents AABBCcxAabbCc, assume simple dominant and independent assortment. What proportion of the approach and he will be expected to phenotypically resemble the first parent?

Answer 21

C) 3/4

Question 22

Drosophila (fruit flies) usually have long wings (+) but mutations and two different genes can result in bed wings (BT) or if it’s the viewings (VG). If a homozygous bent wing fly is made it with the Hamas I guess this is your Wi-Fi, which of the following offspring would you expect?

Answer 22

A) all + BT + VG heterozygotes

Question 23

The flower color trait in radishes is an example of which of the following?

Answer 23

D) incomplete dominance

Question 24

A 1:2:1 phenotypic ratio in the F2 generation of a mono hybrid cross is a sign of

Answer 24

C) incomplete dominance.

Question 25

And snap dragons, heterozygotes for one of the genes have pink flowers, whereas homozygotes have red or white flowers. One plants with red flowers are crossed with plants with white flowers, what proportion of the offspring will have pink flowers?

Answer 25

E) 100%

Question 26

Tallness (T) in snapdragons is dominant to dwarfism (t), while red, (R) flower color is dominant to white (r). The heterozygous condition results in pink (Rr) flower color. A dwarf, read snapdragon just crossed with a plan I was I guess for Thomas and white flowers. What are the genotype and phenotype of the F1 individuals?

Answer 26

D) TtRr-tall and pink

Question 27

Skin color and a certain species of fish is inherited via a single gene with four different alleles. How many different types of games would be possible in the system?

Answer 27

C) 4

Question 28

And cattle, rain coat color (in mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red: 2 roan: 1 white?

Answer 28

B) Roan x white

Question 29

Which describes the ability of a single gene to have multiple phenotypic effects?

Answer 29

C) pleiotropy

Question 30

Which describes the ABO blood group system?

Answer 30

B) multiple alleles

Question 31

Which of the following terms best describes when the phenotype of The heterozygote differs from the phenotypes of both homozygotes?

Answer 31

A) incomplete dominance

Question 32

Cystic fibrosis affects the lungs, the pancreas, the digestive system, and other organs, resulting in symptoms rranging from breathing problems to recurrent infections. Which of the following terms best describes this?

Answer 32

C) pleiotrophy

Question 33

Which of the following is an example of polygenic inheritance?

Answer 33

E) skin pigmentation in humans

Question 34

Hydrangea plants of the same genotype are planted in large flower garden. Some of the plants produce blue flowers and others pink flowers. This can be best explained by which of the following?

Answer 34

A) environmental factors such as soil pH

Question 35

Which of the following provides an example of epistasis?

Answer 35

C) and rabbits and many other mammals, one genotype cc prevents any fur color from developing

Question 36

Most jeans have more than two alleles. However, which of the following is also true?

Answer 36

D) there may still be only two phenotypes for the trait

Question 37

Huntington’s disease is a Dominic condition with late age of onset and humans. If one parent has the disease, What is the probability that his or her child will have the disease?

Answer 37

C) one half

Question 38

A woman has six sons. The chance that her next child will be a daughter is

Answer 38

C) one half

Question 39

When a disease is said to have a multi-factorial basis, it means that

Answer 39

A) both genetic and environmental factors contribute to the disease

Question 40

And ideal procedure for fetal testing in humans would have which of the following features?

Answer 40

A) lowest risk procedure that would provide the most reliable information

Question 41

Hey scientist discovers a DNA-based test for the allele of a particular gene. This and only this a Leo, if homozygous, produces an effect that results in death at or about the time of birth. Of the following, which is the best use of this discovery?

Answer 41

B) to design a test for identifying heterozygous c carriers of the allele