Question

ANswer check

Answer 1

@Vocaloid

Answer 2

yeah that should be right

Answer 3

oh make sure you don't skip the second bullet point for #1

Answer 4

I wasn't sure how to do that one :S

Answer 5

it's the same logic, you just want Aa Bb, Dd instead

it says that the E gene can be ee, Ee, or EE so that covers all possibilities so you only need consider the A, B, and D genes

Answer 6

and make punnet squares for them right

Answer 7

i mean like separate ones or combine them

Answer 8

you already made punnet squares so you just need to calculate the probability of AaBbDd based on what you already did

Answer 9

and add them?

Answer 10

1/2+1/2+1/2?

Answer 11

notice how you multiplied for the previous problem, right? so the calculation shouldn't be any different, you would multiply not add.

Answer 12

anyway when you get back, for #2 it's asking for the genotypes, not the probabilities

you have a 3:1 ratio between the 4-pod green leaf + 4 pod-yellow leaf so you need to figure out what the genotypes of the parents are likely to be

Answer 13

oh okay got it 1.25%

Answer 14

1.25? I think you shifted a decimal place, 1/2 * 1/2 * 1/2 should be 1/8 = .125

Answer 15

so 12.5%

Answer 16

Okay yeah your right. OKay so for number 2 I would just do a punnet square the way I did and figure out the parents from that

Answer 17

it would be a waste of time to try and calculate each possible punnet square

consider each trait separately: if all the resulting plants have 4 pods, not 3, what is the most likely genotype of the parents?

Answer 18

F

Answer 19

its more dominant

Answer 20

remember that genotypes have two alleles, so if there are only F alleles, both parents must be FF

any ideas on the leaf color? 3:1 ration between green and yellow --> what genotypes?

Answer 21

Gg

Answer 22

awesome so FFGg

Answer 23

next one is a bit harder but since half have green leaves and half have yellow leaves what are your thoughts?

Answer 24

50/50

Answer 25

so um it would be FFGG?

Answer 26

hm, no, that would make every offspring have the same genotype

Answer 27

OH right okay so it would ge FfGg

Answer 28

I think :S

Answer 29

almost

let's consider the traits separately

we have a 3:1 ratio between 4-pods and 3-pods

and a 1:1 ratio between yellow and green

so thinking back to 2*2 crosses what genotype ratios give you these phenotype ratios?

Answer 30

remember, parents do not have to have the same genotype

Answer 31

Well FfGg gives 3:1, we know that

Answer 32

consider F and G separately

Answer 33

the F-allele must give a 3:1 ratio
the G-allele must give a 1:1 ratio

Answer 34

Would I refer back to the square I made :S

Answer 35

think about a 2*2 cross

two heterozygotes give a 3:1 ratio right?
and a heterozygote + homozygous recessive gives a 1:1 ratio right?

so putting this logic together, what must the genotypes of the parents be? you will have to write a different genotype for each parent

Answer 36

Okay so hetero would be FfGg and homo would be FG ?

Answer 37

:S

Answer 38

OHhh

Answer 39

I know

Answer 40

both of them are heterozygotes for F --> both are Ff
for G, one of them is a heterozygote and the other is a homozygous recessive --> one of them is Gg and the other is gg

Answer 41

now try writing out the full genotypes

Answer 42

FfGg Ffgg

Answer 43

good

since it asks to show the crosses, you would show the crosses for the genotypes we determined

so for A show FFGg * FFGg
and for B show FfGg * Ffgg

Answer 44

like, the punnet squares

Answer 45

would this be 2x2 or 4x4

Answer 46

these are dihybrid crosses so 4x4

Answer 47

THe crosses would be FG, Fg, Gg, gF?

Answer 48

the double ff's are throwing me off when im drawing the square

Answer 49

Like at the top of the swuare those would be the 4 values right

Answer 50

almost (personally I'd write the F's first to get FG, Fg, FG, Fg)

Answer 51

since both parents in A have the same genotype, the left side is also the same 4 allele combos

Answer 52

remember you group the same letter together when you write genotypes

FFGG not FGFG

Answer 53

wait this would be part A right :S

Answer 54

\(\color{#0cbb34}{\text{Originally Posted by}}\) @Vocaloid
good

since it asks to show the crosses, you would show the crosses for the genotypes we determined

so for A show FFGg * FFGg
and for B show FfGg * Ffgg
\(\color{#0cbb34}{\text{End of Quote}}\)

Answer 55

that's part B

Answer 56

\\(\color{#0cbb34}{\text{Originally Posted by}}\) @Vocaloid
good

since it asks to show the crosses, you would show the crosses for the genotypes we determined

so for A show FFGg * FFGg
and for B show FfGg * Ffgg
\(\color{#0cbb34}{\text{End of Quote}}\)

Answer 57

but either way you need to re-do your part A anyway since you wrote the genotype alleles in the wrong order

Answer 58

so this is right for part B

Answer 59

\\(\color{#0cbb34}{\text{Originally Posted by}}\) @Vocaloid
good

since it asks to show the crosses, you would show the crosses for the genotypes we determined

so for A show FFGg * FFGg
and for B show FfGg * Ffgg
\(\color{#0cbb34}{\text{End of Quote}}\)

part A asks for FFGg * FFGg, you wrote that in the part B slot instead

Answer 60

copy the FFGg * FFGg punnet square into part A, then for part B write the FfGg * Ffgg punnet square

Answer 61

are these the right crosses for Part B

Answer 62

for top parent: should be FG Fg fg fg (change the third one)

for other parent: Fg Fg fg fg (notice how there are no capital G's since parent 2 has no capital G alleles)

Answer 63

BUt there is a capital F. that wouldn't matteR?

Answer 64

the f allele does not influence the g allele

Answer 65

Got it finally

Answer 66

SO for this problem its only asking for the ratio

Answer 67

how would I determine whether its asking for the ratio or the percentage

Answer 68

what

no, it's asking for the genotypes, you need to know the ratios to be able to find out what the genotypes are

if it wants the ratios/percentages it will ask for them

Answer 69

no no . i meant in any given problem

Answer 70

nvm

Answer 71

it'll specify ratios or percentages, if not, either is acceptable since they both are just different ways to express the same thing

Answer 72

I think ratios would be better though

Answer 73

perfect thanks