week 10

Question 1

If I crossed the following parents, PP x pp, how many different genotypes would I end up with

Answer 1

1

Question 2

In flower red color is completely dominant to yellow color. what would the genotype of a yellow flower be

Answer 2

rr

Question 3

Tall is dominant to dwarf in pea plants. if two dwarf pea plants were crossed, their offspring will be

Answer 3

all dwarf plants

Question 4

you discover a new sunflower that has blue flowers instead of yellow. when you cross this blue variety with a common yellow variety you get blue and yellow speckled flowers. what type of inheritance pattern does this gene exhibit

Answer 4

codominance

Question 5

in a dihybrid cross of two heterosygous individuals, which of the following phenotypic ratios would be expected

Answer 5

9:3:3:1

Question 6

which of the following would represent the genotype for a mouse with white fur when the allele for blcak fur is completely dominant to the allele for white fur

Answer 6

bb

Question 7

color blindness is a recessive x-linked trait. a normal couple has a color-blind child. who esle in this family is probably color blind

Answer 7

the child’s maternal grandfater

Question 8

if two persons with bloodtype O had a daughter, what could her bloodtype be

Answer 8

O

Question 9

An organism that is heterozygous for two traits can produce a maximum of ___ different gametes for these traits

Answer 9

4

Question 10

epistasis can best be described as

Answer 10

the modification of the expression of one gene by the other

Question 11

in working an incomplete dominance problem, you have crossed a purple flower with a white flower. the resulting flower has the heterozygous genotype, what would the flower’s phenotype be

Answer 11

lavender

Question 12

if you were to describe the following genotype, Gg. how would you classify it

Answer 12

heterozygous

Question 13

a male is heterozygous for the trait that produces freckel on the skin, and he has freckles. If he marries a woman who is also heterozygous for freckes,__percent of their children will be freckled and ___ percent of their children will be heterozygous

Answer 13

75%…50%

Question 14

A ___ allele does not express itself unless the organism is homozygous for that allele

Answer 14

recessive

Question 15

Downs syndrome is a result of a ___ condition

Answer 15

trisomy

Question 16

a corss between two pea plants produces a popluation of 732 purple and 268 white plants. what is the genotype and phenotype of the parents that proudced this population

Answer 16

both parents are heterozygous purple

Question 17

the ___ is the physical expression of the genes present in an organism (it is what the organism looks like)

Answer 17

phenotype

Question 18

which of the following genotypes would be correct for a two factor cross

Answer 18

BbXx

Question 19

In humans, having dimples in the cheeks is a dominant trait. If a child has dimples but only one of her parents does, what are the genotypes of her parents

Answer 19

dd, Dd or DD

Question 20

In snapdragons, pink flowered plants are produced when red flowered plants are crossed with white flowered plants. This type of inheritance can best be described as

Answer 20

incomplete dominance

Question 21

in blood typing, which alleles are condominant to each other

Answer 21

A and B

Question 22

The location on alleles on a chromsomes is called their

Answer 22

locus

Question 23

For the trait of hair color red, blonde, and brown are all examples of

Answer 23

alleles

Question 24

___ are alternate forms of a gene

Answer 24

alleles

Question 25

in a sex linked trait carred on the x chormosome, a male would have __ allele(s) for this trait and a woman would have ____ allele(s) for this trait

Answer 25

one...two

Question 26

what is the name of the individual that is creditied for discovering genetics as we study it today

Answer 26

gregor mendel

Question 27

hwo can you determine the genotype of a plant showing the dominant phenotype of red color

Answer 27

cross the red plant with a white plant to see if any white plants appear

Question 28

two babies are mixed up in the hospital nursery. the blood types of couple 1 are A and O and the blood types of couple 2 are AB and B. Baby joe has blood type O and baby jane has blood type A. Who are the parents of Baby Joe and Baby Jane

Answer 28

Couple 1 baby joe or jane | couple 2 baby jane

Question 29

when an organism has two different alleles for a trait, it is said to be

Answer 29

heterozygous

Question 30

which of the following accurately gives the distribution of phenotypes produced from a cross of purple dwarf pea plants that are heterozygous for flower color and plant heigh

Answer 30

63 purple dwarf 28 purple tall 27 white dwarf 7 white tall

Question 31

assume you had a plant that was heterozyhous for both flower color and leaf style. in this case the plant had red flowers (instead of yellow) and fuzzy leaves( instead of nonfuzzy). if this plant self-fertilized which ratio below would you expect to be the phenotypic ration(remeber ratios written in order starting with the most dominat)

Answer 31

9:3:3:1

Question 32

two true breeding pea plants are crossed, one with purple flowers and one with white flowers. their offspring would be

Answer 32

heterozygous with the dominant phenotype

Question 33

blood type is an example of a trait that is expressed through

Answer 33

codomiance

Question 34

colorblindness is more prevalent in ___ because it is___

Answer 34

males...x-linked recessive

Question 35

which of the following are true about sex selection of the offspring in humans

Answer 35

all of the above

Question 36

when two true breeding parental genotypes are crossed their offspring are refrred to as the

Answer 36

F1 generation

Question 37

if you mate a long hair guniea pig with a short hair guinea pig and you get offspring with intermediate length hair what might you conclude

Answer 37

that the gene for hair length is incompletely dominant

Question 38

if two purple flowers are mated and sometimes the offspring have red flowers, what would you conclude

Answer 38

that both parents are heterozygous and purple is dominant

Question 39

if a pink snapdragon is self-fertiblized, the offspring are red, pink and white what type of inheritance pattern does flower color exhibit in this example

Answer 39

incomplete dominance

Question 40

___is the term for the genes that the organism contains (we cannot see this by looking at the organism)

Answer 40

genotype