23 terms

Chapter 14 Mendel Idea

What do we mean when we use the term monohybrid and dihybrid cross?
A dihybrid cross involves organisms that are herterozygous for two characters and a monohybrid cross involves only one.
Why did the F1 offspring of Mendels classic pea cross always look like one of the two parental varieties?
One phenotype was completely dominant over another.
What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?
Traits are inherited in discrete units and are not the result of "Blending."
How many unique gametes could be produced through independent assortment by an indivisual with the genotype AaBbCCDdEE?
Why did Mendel continue some of his experiments to the F2 or F3 generation?
To observe whether or not a recessive trait would appear.
Two plants are crosses, resulting in offspring with a 3:1 ration for a particular trait. What does this suggest?
That the parents were hoth heterozygous for a single trait.
A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in the gamete for this organism?
When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessive phenotype?
Mendel accounted for the observation that the traits which had dissapeared in the F1 generation reappeared in the F2 generation by proposing that
Traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1.
The fact that all seven of the pea plants traits studied by obeyed the principle of independent assortment most probably indicates which of the following?
All of the genes controlling the traits behaved as if they were on different chromosomes.
Mendel`s observation of the segregation of alleles in gamete formation has its basis in which of the folowing phases of cell division?
Anaphase I of Meiosis
Black fur in mice (B) is dominant toe brown fur (b). Short tails (T) are dominant to long tails (t). What fraction of the grogeny of crosses BbTt x BBtt will be expected to have black fur and long tails?
In certain plants, talll is dominant to short. If a heterozygois plant is crossed with a homozygous tall plant, what is the possibilities that the offspring will be short?
In the cross AaBbCc x AaBbCc, what is the probibility of producing the genotype AABBCC?
Given the parents AABBCc x AabbCc, assume simple dominance for each trait and independent assortment. What proportion of the progeny will be expected to phenotypicallly resemble the first parent?
Which of the folowing is the best statement of the use of the addition rule of probibility?
Which of the following calculations require you to utilize the addition rule?
In cattle, roan coat color (mixed red and white hairs) occurs in heterozygous (Rr) offspring of red (RR) and white (rr) homozygous. Which of the following crosses would produce offspring in the ratio of 1red:2 roan: 1 white?
Which of the following describes the ability of a single gene to have multiple phenotypic effects?
Cystic fibrosis affect the lungs, the pancreas, the digestive system, and other organs, resulting in symptoms from breathing dificulties to recurrent infections. Which of the following terms best describes this?
Which of the following is an example of polygentic inheritance?
Hydranga plants of the same genotype are panted in a large flower garden. Some of the plants produce blue flowers
Which of the following provides an example of epistasis?