Bio Chp. 7

white
In snapdragons, there is an allele for flower color, CW, that produces no pigment. A plant with the genotype CWCW will produce _____________ flowers.
recessive
If, when in a heterozygous state, one allele masks the effect of the other allele, the masked allele is referred to as:
We will write a custom essay sample on
Bio Chp. 7
or any similar topic only for you
Order now
consists of the observable properties of an individual.
A phenotype:
you have A antigens
If you have blood type A, which of the following is true about you?
estrogen helps bones to fuse at their ends and thus stop growing.
In the case of human height genes, a gene on chromosome 15 codes for an enzyme that converts testosterone to estrogen. This enzyme influences human height because:
Individuals carry two copies of gene instructions, and one dominant allele could mask the presence of a recessive defective allele
How can an individual carry a defective gene but not exhibit the defective phenotype?
11
The figure shown here is from a “meta study” of all the published findings on the relationship between the CC genotype (linked to increased novelty-seeking behavior) and scores on novelty-seeking measures.

From the graph, how many studies were included in the meta study?

A, B, AB, or O
A woman with type B blood and a man with type A blood could have children with which of the following phenotypes?
green and wrinkled
In the figure shown, which are the recessive traits?
a gene
Which of the following did Gregor Mendel never see?
All of the above blood types would work fine.
A person with the genotype AB can receive blood of what type?
malaria
The same genetic condition that causes sickle-cell anemia can also protect against
Genes for different traits sort independently of each other.
The fact that freckles tend to be inherited with red hair is counter to which of Mendel’s assertions?
dominance
A cross between homozygous red-eyed flies and homozygous white-eyed flies results in progeny that all have red-eyes. This result demonstrates:
homozygous for that gene.
A diploid individual with two identical alleles for a particular gene is said to be:
alleles
Most genes come in alternative forms called:
polygenic
In the case of Mendel’s peas, a single gene determined the height of the plant. However, in humans, adult height is influenced by many genes. A trait such as human height is said to be:
each of two alleles for a given trait segregate into different gametes.
The law of segregation states that:
interaction between genotype and environment.
The failure of a seedling to turn green if grown in the dark is an example of:
The son of a woman with this condition has a 100% chance of also having this condition.
A rare, X-linked dominant condition in humans, congenital generalized hypertrichosis, is marked by excessive hair growth all over a person’s body. Which of the following statements about this condition is INCORRECT?
three; four
The ABO blood type system in humans is a system that contains ________ alleles that produce __________ different phenotypes.
1/4
Looking at the information in the table above, if the A allele results in normal pigmentation and the a allele in albinism, what fraction of offspring would you expect to show albinism?
The dominant trait is the one which is expressed.
Which of the following statements about dominant traits is correct?
homozygous recessive
Albinism (lack of skin and hair pigmentation) is caused by a recessive autosomal allele. A woman and man, both normally pigmented, have an albino child together. For this trait, what is the genotype of the albino child?
they would be more likely to exhibit novelty-seeking traits
On human chromosome 11 there is a gene called DRD4. This gene carries the instructions for building a protein that is receptor for the brain chemical dopamine. There are two different alleles, C and T.

Subjects in a study (with known DRD4 genotypes) responded to a questionnaire on temperament and character. Based on the graph shown above, what conclusion might you draw about an individual with two C alleles?

observing the organism.
The phenotype of an organism can best be determined by:
All of the above.
An allele:
AO x AO
Which of the following pairings, indicated by letters referring to blood type phenotypes, CANNOT produce a child with type B blood?
three; four; six
In the ABO blood type system in humans, there are _________ different alleles, ____________ different phenotypes, and ____________ different genotypes.
homozygous for the recessive allele.
At locus A, the individual bearing these two homologous chromosomes is:
The “windblown” shape seen in coastal trees is a result of environmental conditions, not their genes.
Monterey cypress trees grow along the coast of California with most of their branches clustered on one side of the tree, pointing away from the sea. If a monterey cypress seed is germinated beyond 50 miles from the coastline, the tree grows up with a symmetric distribution of branches, just like other evergreens. This scenario demonstrates which statement about genetics?
Yes, a woman can have an X-linked recessive trait if her father has the trait and her mother is either homozygous or heterozygous for the trait.
Is it possible for a woman to have a X-linked recessive trait; if it is, how can this occur?
The harmful allele can reside in heterozygous individuals with few to no negative effects.
Cystic fibrosis, which is usually lethal before reproductive ages, is a homozygous recessive disease. Why do cases continue to arise, even though people with the disease rarely live to reproduce?
2 AA: 2 Aa: 0 aa; all pigmented
If two giraffes were crossed, where one is heterozygous for albinism (a) and the other has a homozygous dominant genotype, what would be the expected genotypic and phenotypic ratios?
pleiotropy.
The impact of a single gene on more than one characteristic is called:
They’re both alleles for the same trait.
Sickle-cell anemia is a genetic disease caused by the presence of a faulty hemoglobin gene (HbS). The normal version of this gene is HbA. Which of the following is TRUE about HbS and HbA?
the genotype in combination with the environment.
Phenotypes are generally a product of:
We learned that many traits are inherited in discrete units, and are not the result of blending.
What was the MOST important scientific advance gained from Gregor Mendel’s experiments with pea plants?
1/2
In peas, tall plants are dominant to short plants. A heterozygous plant is crossed with a homozygous recessive plant. What fraction of the offspring would you expect to have the short phenotype?
25% red, 50% pink, and 25% white.
Flower color in snapdragons is an example of incomplete dominance. When a red-flowered plant is crossed with a white-flowered plant, the offspring have pink flowers. If a pink-flowered plant is crossed with another pink-flowered plant, their offspring will be:
One of the two plants could be homozygous for the dominant allele while the other could be heterozygous.
How can two pea plants that have different genotypes for seed color be identical in phenotype?
They have red blood cells with A and B antigens.
Which of the following is true of an individual with blood type AB?
1 PP : 2 Pp
Gregor Mendel bred two pea plants, one with purple flowers and one with white flowers and found that the next generation all had purple flowers. When he bred all of the plants in the generation with purple flowers, he found that the next generation had 3/4 purple flowers and 1/4 white flowers. What are the genotypes of the purple flowers of the last generation?
a) and b) are both correct.
The test-cross:
peas have a particularly long generation time.
Peas (Pisum sativum) were well suited for Mendel’s breeding experiments for all of the following reasons except:
×

Hi there, would you like to get such a paper? How about receiving a customized one? Check it out