chapter 10 quiz - Genetics

Blending Model

Genetics idea in the early 1800's described that a red flowered plant crossed with a white flowered plant would produce offspring which are pink flowered plants. This concept is called..

F1

In a mendelian monohybrid cross, the ___ generation is always completley heterozygous

The flower is not enclosed in petals

Which of the following was not a factor in choosing the pea plant to perform genetic experiments?

amniocentesis

a doctor inserts a needle into the uterus and removes some fluid to perform a genetic test. which of the following procedures did the DR perform?

an inability to clot blood

a person with marfan syndrome could have all of the following symptoms except..

homozygous recessive

a plant with yellow flowers was crossed with a plant with red flowers. All of the numerous offspring had red flowers. what does this show about the genotype of the parental plant with yellow flowers

dominant phenotype, recessive phenotype

a testcross occurs when an individual with the ___ is crossed with an individual having the ___

Woman Aa, Man aa

a woman who can roll her tongue is married to a man who cannot. Two of their four children can roll their tongue, and two cannot. What is the genotype of the parents

FfDd x FfDd

assume freckles and dimples are dominant traits. Two individuals with freckles and dimples have a child with no freckles and no dimples. What are the genotypes of the parents

25%

both parents are heterozygous for the autosomal recessive Tay-sachs disease. if three children in a row were born with tay-sachs disease, what are the chances that the next child will have tay sachs?

false

genetic crosses which involve two traits are referred to as phenotypic crosses. True or false?

Transfer pollen from one plant to the other

if a biologist wanted to manually cross fertilize two pea plants, which of the following steps must me taken..

a possible gamete of the parent

if a genotype of an organism is YySsTt, then what does yST represent?

50% since the mother is a carrier

if a woman is a carrier for the X-linked recessive colorblindness and her husbanc is normal, what are their chances that a son will be colorblind

only tt

if an organism shows a recessive phenotype, such as short pea plants, it can be :

law of independent assortment

if pairs of factors separate independently of other pairs of factors, you are dealing with the..

pleiotropy

if you were studying the phenomena of one gene having more than one effect, you would be studying which of the following?

50%

if your mother is homozygous recessive and your father is hererozygous for the autosomal dominant huntington disease, what are your chances of escaping the disease?

carriers

in a recessive disorder, individuals who have that recessive allele but not the disorder are referred to as:

9 short black hair, 3 black long hair, 3 brown short hair, 1 brown long hair

in guinea pigs, B=black, b=brown, S=short hair, s= long hair. what would the expected results if a BbSs mated with a BbSs?

Bb

in humans brown eyes (B) are dominant over blue eyes (b). a brown eyes woman who has a blue eyed child would have the genotype..

0%

in humans, brown eyes (B) are dominant over blue eyes (b). if a homozygous brown eyed woman mates with a homozygous blue eyed man, what are the chances of producing a blue eyed child?

Monohybrid Cross

in which kind of cross would you expect to find a ratio of 3:1 among F2 offspring

are distributed to seperate gametes

mendels law of segregation implies that the two members of an allelic pair ..

Dominant

term that would best be used for an allele which can mask the expression of another allele

50%

the four o'clock flower is an example of an incomplete dominance. R= red, r = white, and Rr = pink. if two hybrids are crossed, what are the chances that an offspring will have pink flowers?

linkage group

the genes on a single chromosome form a ____ because these genes tend to be inherited together

true

true or false: individuals who are heterozygous for the sickle cell disease have an increased resistance to the protozoan which causes malaria

alternative forms of a gene for a single trait, such as blue eyes and brown eyes

what are alleles?

a multifactoral trait

what is a trait that is controlled by a combination of genes plus environmental influences

multiple alleles

when a trait has more than two different forms, the gene has...

heterozygous

when an organism has two different alleles for a particular trait, which term best describes this condition

homozygous

when an organism has two identical alleles for a trait we would refer to this condition as :

codominance

when two different dominant alleles are both fully expressed in the phenotype, it is referred to as..

polygenic inheritance

when two or more sets of alleles affect the same trait, it is referred to as..

one factor must be dominant and one factor recessive in each individual

which is not true according to mendels law of segregation

PKU

which of the following disorders is caused by individuals lacking an enzyme which is needed to break down the amino acid phenylalanine, and if not treated with a proper diet avoiding phenylalanine, severe mental retardation occurs.

neurofibromatosis

which of the following disorders is characterized by benign tumors made up of nerve cells and may include skeletal deformities?

cystic fibrosis

which of the following disorders is characterized by thick, viscous mucus production in the lungs and digestive tract?

in males, the Y allele will mask the disorder X allele

which of the following statements is not true about X-linked disorders

phenotype

which of the following terms is represented by word descriptions, such as brown or tall?

he showed how X-linked disorders are inherited

which of the following was a contribution Thomas Hunt Morgan made to genetics?