Genetic diagrams - simple monohybrid crosses

Question 1

What do diploid organisms have?

Answer 1

Two allele for each gene

Question 2

What are gametes?

Answer 2

Haploid

Question 3

What are genetic diagrams used for?

Answer 3

to predict the genotypes and phenotypes of the offspring produced if two parents are crossed

Question 4

What is monohybrid inheritance?

Answer 4

The inheritance of a characteristic controlled by a single gene

Question 5

What does a monohybrid cross show?

Answer 5

The likelihood of the different alleles of that gene being inherited by offspring of certain parents

Question 6

What are the 4 stages to do a genetic diagram?

Answer 6

1) If you use letters that aren’t in the question, write a key
2) Show the parents’ genotypes at the top
3) Write the gametes of each parent underneath
4) Show all of the different ways which the gametes could combine to show the combinations of alleles of the offspring

Question 7

What do you always get if you cross two homozygous parents?

Answer 7

All heterozygous offspring

Question 8

What ratio do you get when you cross two heterozygous parents?

Answer 8

3 : 1

Dominant : recessive

Question 9

What are the two ways of showing monohybrid inheritance?

Answer 9

Genetic diagram

Punnett square

Question 10

What ratio would you expect if you did a monohybrid cross with two heterozygous parents with co-dominant alleles?

Answer 10

1 : 2 : 1