quiz 10 transmission genetics

Question 1

phenotype

Answer 1

outward appearance

Question 2

allele

Answer 2

one version of a gene

Question 3

uppercase letter A

Answer 3

dominant allele

Question 4

lowercase letter a

Answer 4

recessive allele

Question 5

genotype Aa

Answer 5

combination of genes/alleles carried

Question 6

every mendelian cross begins with _______ parents

Answer 6

true breeding

Question 7

parental variety seen in the f1 progeny is considered the ______ trait

Answer 7

dominant

Question 8

parental variety that is absent in the f1 progeny is considered the _____ trait

Answer 8

recessive

Question 9

f2 progeny distribution

Answer 9

3/4 dominant, 1/4 recessive

Question 10

Po: PP (______ dominant) Pp (______ recessive)
F1: Pp (_______)
F2: PP (_______ dominant) Pp/pP (_______) pp (_____ recessive)

Answer 10

homozygous dominant; homozygous recessive; heterozygous

homozygous dominant; heterozygous; homozygous recessive

Question 11

A mendelian cross always begins with _________

Answer 11

true breeding parents

Question 12

There are at least three generations in a mendelian cross - what are the three?

Answer 12

The parental, F1, and F2

Question 13

The dominant and recessive variations of a trait can be determined with which generation?

Answer 13

F1 generation

Question 14

What ratio is seen in the F2 generation, what is it indicative of?

Answer 14

3:1 ratio, indicative of the segregation of two alleles

Question 15

Mendelian theory - what part of mendelian theory challenged preformation?

Answer 15

females and males contribute equally to the offspring - preformation states that every gamete carried a potential child

Question 16

Mendelian theory - what part of mendelian theory challenged blending?

Answer 16

recessive traits were not irreversibly blended together - blending states that the offsprings characteristics were an average between two parents

Question 17

incomplete dominance

Answer 17

not all dominant alleles produce a fully dominant phenotype

Question 18

incomplete dominance - full phenotype, half phenotype, no phenotype present

Answer 18

FF, Ff, ff

Question 19

in an incomplete dominant mendelian cross, what does the F1 generation consists of?

Answer 19

Ff, heterozygous, split phenotypes

Question 20

in an incomplete dominant mendelian cross, what does the F2 generation consist of?

Answer 20

a ratio of 1:2:1, instead of 3:1

Question 21

co-dominance

Answer 21

a case where there is more than 1 possible dominant allele

Question 22

codominance - mixing and creation of a new _________

Answer 22

dominant - heterozygous is completely new phenotype

Question 23

a dominant allele is almost always an allele that ________ a product. A ________ allele does not

Answer 23

produces; recessive

Question 24

_______ and ________ alleles have similar inheritance patterns, but they can be distinguished by understanding how each allele is producing or failing to produce a product

Answer 24

incomplete and co-dominant

Question 25

What do we call the phenotype(s) seen in the F1 generation?

Answer 25

dominant

Question 26

Random cross: which is the dominant trait?

Answer 26

NO WAY TO TELL RANDOM CROSS

Question 27

What is the genotype of the F1 generation in a Mendelian cross?

Answer 27

Heterozygous

Question 28

What is the genotypic ration of the F2 generation in a monohybrid mendelian cross?

Answer 28

1:2:1

Question 29

what phenotypic ratio would you expect to see in the third generation of a human family?

Answer 29

1:1

Question 30

You find a brown female (agouti) rabbit and take it home. How could you determine its genotype?

Answer 30

perform a test cross

Question 31

What is the genotype of the F1 generation as it refers to incomplete dominance?

Answer 31

Heterozygous

Question 32

What is the distribution for the F2 generation of a incomplete dominance cross?

Answer 32

1/4 AA, 1/2 Aa, 1/4 aa

Question 33

What does incomplete dominance tell us about these alleles?

Answer 33

The dominant produces a product but the recessive does not. The intermediate phenotype is a result of reduced dosage

Question 34

Codominance

Answer 34

No true recessive, neither allele is necessarily dominant over the other

Question 35

What is the result of this codominant cross? ArAr x AbAb

Answer 35

ArAb - F1

Question 36

What is the result and distribution of this codominant cross? ArAb x ArAb

Answer 36

1/4 ArAr, 1/2 ArAb, 1/4 AbAb - F2

Question 37

What is suggested by “two dominant alleles?”

Answer 37

both alleles make a functioning product but the products differ from one another. The mixing of the two products creates the intermediate phenotype

Question 38

Which type of inheritance best describes the patterns in this cross?
P: White x Red
F1: All have Red
F2: 1/4 white, 3/4 red, 3:1 ratio

Answer 38

fully dominant allele

Question 39

which type of inheritance best describes the patterns in this cross?
P: White x Red
F1: Pink
F2: 1/4 white, 1/2 pink, 1/4 red

Answer 39

co-dominance

Question 40

which type of inheritance best describes the patterns in this cross?
P: yellow x red
F1: both red and yellow spots
f2: 1/4 yellow, 1/2 red+yellow, 1/4 red

Answer 40

incompletely dominant allele