Can you help with my biology homework? The instructions are in the first pic and the second pic is what I did so far. Please help me with the rest and please confirm the ones that I did are correct...

Can you help with my biology homework? The instructions are in the first pic and the second pic is what I did so far. Please help me with the rest and please confirm the ones that I did are correct too. Thank you.

1) List all of the possible genotypes that can result.

2) Calculate the genotypic ratio for this cross.

3) List all of the possible phenotypes that can result.

4) Calculate the phenotypic ratio for this cross.

Thank you :)

Asked on by Angie A.

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mr-mayonnaise | Middle School Teacher | (Level 1) Assistant Educator

Posted on

When checking for the individual properties we need to understand the distinction between the genotype and the phenotype. The genotype refers to the actual genetic make-up of the organism (RrYy) whereas the phenotype is what you see expressed (Round/wrinkled, green/yellow).

A) All possible genotypes include:

RRYY

RRYy

RrYY

RrYy

RRyy

Rryy

B) The genotypic ratio is as follows:

RRYY 1/16 : 6.25%

RRYy 2/16 : 12.5%

RrYY 3/16 : 18:75%

RrYy 6/16 : 37.5%

RRyy 1/16 : 6.25%

Rryy 3/16 : 18.75%

C) All possible phenotypes are as follows:

(het = heterozygous, hom = homozygous)

Round both heterozygous and homozygous

Yellow both heterozygous and homozygous

Green homozygous

D) All possible phenotype probabilities are as follows

(het = heterozygous, hom = homozygous)

Round hom 4/16 : 25%

Round het 12/16 : 75%

Yellow hom 4/16 : 25%

Yellow het 8/16 : 50%

Green hom 4/16 :25%

Hope that works! 

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mr-mayonnaise | Middle School Teacher | (Level 1) Assistant Educator

Posted on

I did want to include on section D, if we were to take out the homozygous and heterozygous qualifiers we would have:

Round 100%

Yellow 75%

Green 25%

Also, if we were to combine them, we have the following phenotype probabilities:

Round/Yellow 12/16 : 75%

Round/Green 4/16 : 25%

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Angie A. | Student, Grade 9 | (Level 1) Salutatorian

Posted on

Sorry the picture is right below here. Sorry for the inconvenience, my phone was acting weird and posting different pictures that I don't want.

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Angie A. | Student, Grade 9 | (Level 1) Salutatorian

Posted on

Teachers please read this before you answer:

Sorry my first picture did not go through somehow so please look at the image I meant to also post. Here 

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