3. Listed below are the phenotypes of the offspring from a pizza self fertilization experiment regarding...

3. Listed below are the phenotypes of the offspring from a pizza self fertilization experiment regarding the traits of toppings and crust thickness. Yeah that’s right, in my dream world pizza can self fertilize. AND THEN I EAT IT ALL.

offspring phenotype	# of offspring
cheese, thin crust	67
veggie delight, thin crust	22
cheese, thick crust	197
veggie delight, thick crust	64

What is the dominant phenotype for pizza toppings?

OK. So, in looking at these data, do you think these genes are linked or unlinked? Briefly explain how you arrived at that conclusion.

So if you did a dihybrid testcross with your dihybrid, what would the phenotypic ratio be?

Solutions

Expert Solution

Dominant phenotype for pizza toppings - Cheese ( dominant phenotypes appear more than that of recessive phenotype)

Genes are not linked. If genes are linked the possible phenotypes that occur due to recombinations will be very less. That's if 197 off springs have Cheese and thick crust, these traits donod split up and produce recombinants like cheese and thin crusts.

Let's cheese be C and thick crust be T, let's veggie crust be c and thin crust be t

Test cross : phenotypic ratio = 9:3:3:1

gladiator answered 1 year ago

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