Ch 14 Flashcards
Pea plants were particularly well suited for Mendel’s experiments for all of the following reasons except
D) Peas have an unusually long generation time
What is the difference btw a monhybrid and a dyhybrid cross?
C) dyhybrid involves organisms that are heterozygous for two characters
A cross btw a homozygous purple flower and homozygous white flowered pea plants results in offspring with purple. This demonstrates
C) dominance
The F1 offspring of Mendel’s classic pea cross always looked like one of the two parental varieties because
A) one phenotype was completely dominant over another
What was the most significant conclusion that Mendel drew from his experiments with pea plants?
B) Traits are inherited in discrete units and aren’t blending
How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?
B) 8
Two plants are crossed, resulting in offspring with a 3;1 ratio for a particular trait. This suggests
D) The parent were both heterozygous.
Two characters that appear in a 9;;3;3;1 in the F2 generation should have which of the following properties?
B) The genes controlling the characters obey the law of independent assortment.
A animal with H for head shape and T for tail length. Which is a possible gamete for this organism?
A) HT
It was important that Mendel examined not just the F1 gen but the F2 as well because
B) parental traits that were not observed in the F1 reappeared in F2
Mendel accounted for the observation that traits had disappeared in the F1 gen reappeared in the F2 by proposing that
C) traits can be dominant or recessive
Which of the following statements of law of segregation is false?
E) It is a method that can be used to determine the number of chromosomes in a plant.
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?
D) All of the genes controlling the traits behaved as if they were on different chromosomes
Mendel was able to draw his ideas of segregation and independent assortment because of the influence of which of the following?
E) His experiments with the breeding of plants such as peas
Mendels observation of the segregation of alleles in gamete formation as it’s basis in which of the following phases of cell division?
D) anaphase one of meiosis
Minnows second law of independent assortment as it’s basis and which of the following events of meiosis I?
C) alignment of tetrads at the equator
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?
D) 1/2
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?
B) 1/2
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?
B) 190
And a cross AaBbCcxAaBbCc, What is the probability of producing the genotype AABBCC?
E) 1/64
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?
C) 3/4
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?
A) all + BT + VG heterozygotes
The flower color trait in radishes is an example of which of the following?
D) incomplete dominance
A 1:2:1 phenotypic ratio in the F2 generation of a mono hybrid cross is a sign of
C) incomplete dominance.
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?
E) 100%
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?
D) TtRr-tall and pink
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?
C) 4
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?
B) Roan x white
Which describes the ability of a single gene to have multiple phenotypic effects?
C) pleiotropy
Which describes the ABO blood group system?
B) multiple alleles
Which of the following terms best describes when the phenotype of The heterozygote differs from the phenotypes of both homozygotes?
A) incomplete dominance
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?
C) pleiotrophy
Which of the following is an example of polygenic inheritance?
E) skin pigmentation in humans
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?
A) environmental factors such as soil pH
Which of the following provides an example of epistasis?
C) and rabbits and many other mammals, one genotype cc prevents any fur color from developing
Most jeans have more than two alleles. However, which of the following is also true?
D) there may still be only two phenotypes for the trait
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?
C) one half
A woman has six sons. The chance that her next child will be a daughter is
C) one half
When a disease is said to have a multi-factorial basis, it means that
A) both genetic and environmental factors contribute to the disease
And ideal procedure for fetal testing in humans would have which of the following features?
A) lowest risk procedure that would provide the most reliable information
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?
B) to design a test for identifying heterozygous c carriers of the allele
