Inheritance and Genetics

Question 1

What is a monohybrid cross?

Answer 1

A breeding experiment involving a single characteristic

Question 2

What is the most common monohybrid cross ratio?

Answer 2

3:1

Question 3

What is a Test Cross?

Answer 3

Breeding a phenotypically dominant individual with a known homozygous recessive.

Question 4

How can the results of a test cross be interpreted?

Answer 4

If all offspring are phenoytpically dominant, then the parent must be homozygous dominant.
If there are any phenotypically recessive offspring, the parent must be heterozygous

Question 5

What does the Hardy–Weinberg principle predict?

Answer 5

The frequency/proportion of alleles will stay constant from one generation to the providing no mutation/no selection/population large/population
genetically isolated/mating at random/no migration

Question 6

In humans why are recessive sex linked characteristics more common in males than females (1 mark)

Answer 6

Recessive allele is always expressed in males or
Males have one recessive allele or
Females need to be homozygous recessive or
Y chromosome does not carry a dominant allele