Mendel's First and Second Law

Question 1

What can Mendel’s first law also by called?

Answer 1

The law of segregation

Question 2

What is the law of segregation?

2

Answer 2

This states that inherited characteristics are controlled by pairs of alleles
These alleles segregate/separate from each other at gamete formation. with only one member of the pair being found in each gamete

Question 3

What is the chromosomal basis of Mendel’s first law?

4

Answer 3

In diploid organisms, chromosomes occur in matching pairs called homologous pairs
Pairs of alleles occupy the same position (locus) on a homologous pair
During meiosis, homologous chromosomes separate and go into different cells
As a result the pairs of alleles also separate

Question 4

What is a monohybrid cross?

Answer 4

A monohybrid cross involved the study of a single feature

Question 5

What is a dihybrid cross?

Answer 5

A dihybrid cross involves the study of two characteristics

Question 6

What is the name of Mendel’s second law?

Answer 6

The law of independent assortment

Question 7

What is the law of independent assortment?

Answer 7

This states that when gametes are formed either of a pair of alleles is equally likely to combine with either of another pair of alleles

Question 8

According to Mendel’s second law what gametes can be formed from the genotype AaBb?

Answer 8

AB 
Ab
aB
ab 
Either of the As can combine with either of the Bs therefore every gamete has equal chance of formation

Question 9

What is the chromosomal basis of Mendel’s second law?

Answer 9

At gamete formation either of a pair of homologous chromosomes is equally likely to combine with either chromosome of a second homologous pair