*Unit 5 Part 3: Genetic Crosses

Question 1

Punnett Squares

Answer 1

~Predicts the expected outcomes of a genetic cross by finding all possible combinations of gametes
~Show probable frequencies of offspring
~Does not show the actual offspring you will get

Question 2

Genotypic ratio

Answer 2

Frequencies of each genotype for a trait

Question 3

Phenotypic ratio

Answer 3

Frequencies of each phenotype for a trait

Question 4

What is the genotypic ratio of a homozygous dominant red flowered plant crossed with a homozygous recessive white flowered plant?

Answer 4

100% Rr
4:0 Rr

Question 5

What is the phenotypic ratio of a homozygous dominant red flowered plant crossed with a homozygous recessive white flowered plant?

Answer 5

100% Red
4:0 Red

Question 6

In cats, long hair is dominant to short hair. What is the genotypic ratio of a heterozygous long haired cat crossed with a short haired cat?

Answer 6

50% Ll : 50% ll
2Ll : 2ll

Question 7

In cats, long hair is dominant to short hair. What is the phenotypic ratio of a heterozygous long haired cat crossed with a short haired cat?

Answer 7

50% long hair : 50% short hair
2 long hair : 2 short hair

Question 8

Test cross

Answer 8

Cross between an unknown and a homozygous recessive to figure out the unknown