Testcross Lesson

Genetics

Multiple Choice

What is the phenotype of an individual with the genotype BbRr?

• White, smooth fur

• Black, smooth fur

• White, rough fur

• Black, rough fur

BbRr - how to find the alleles that would be in the gametes

• Match the B with the R

• Match the B with the r

• Match the b with the R

• Match the b with the r

Multiple Choice

How many of the offspring would have a black, rough coat?

• 9

• 7

• 3

• 1

Multiple Choice

How many of the offspring would have a black, smooth coat?

• 9

• 7

• 3

• 1

Multiple Choice

How many of the offspring would have a white, rough coat?

• 9

• 7

• 3

• 1

Multiple Choice

How many of the offspring would have a white, smooth coat?

• 9

• 7

• 3

• 1

Dihybrid cross in Pea Plants

• Yellow seed color (Y) is dominant to green (y)

• Round seed shape (R) is dominant to wrinkled (r)

• What would be the outcome of a cross between a YyRr plant and a yyrr plant

Multiple Choice

What would be the gametes for the YyRr plant?

• YR, YR, yR, yR

• YR, Yr, yR, yr

• Yy, Rr, YY, RR

• yy, rr, yy, rr

Multiple Choice

What would be the gametes for the yyrr plant?

• yR, yr, Yr, YR

• yy, yy, yy, yy

• yr, yr, yr, yr

• YR, YR, YR, YR

Multiple Choice

What is the genotype that should be in the blank square?

• yyRr

• YYRR

• yyrr

• YrYr