20.3 Dihybrid Inheritance

Question 1

What are dihybrid crosses

Answer 1

Used to show the inheritance of two different characteristics caused by two genes. Which my be located on different pairs of homologous chromosomes

Question 2

There are expected ratio of offspring but it may not be reality why is this

Answer 2

Because
- fertilisation of gametes in random process so in small sample a few chance Events can lead to a skewed ratio
- genes being studied are linked genes so if no crossing over the alleles for two characteristics will always be inherited