Monohybrid Inheritance

Question 1

If the two alleles of a gene are the same, how do we describe the individual

Answer 1

homozygous(homo = same)

Question 2

Difference betweenhomozygous dominant andhomozygous recessive

Answer 2

homozygous dominant(having two copies of the dominant allele), homozygous recessive(having two copies of the recessive allele)

Question 3

what is heterozygous

Answer 3

If the two alleles of a gene are different, we describe the individual as beingheterozygous(hetero = different)

Question 4

What are alleles

Answer 4

When completing genetic diagrams, alleles are abbreviated to single letters
The dominant allele is given acapital letterand the recessive allele is given the same letter, butlower case

Question 5

what can alleles of a gene carry

Answer 5

Alleles of a gene can carry the same instructions or different instructions. You can only inherit two alleles for each gene, and they can be the same or different

Question 6

How to make Punnett squares

Answer 6

Determine the parental genotypes
Select a letter that has a clearly different lower case, for example: Aa, Bb, Dd
Split the alleles for each parent and add them to the Punnett square around the outside
Fill in the middle four squares of the Punnett square to work out the possible genetic combinations in the offspring
You may be asked to comment on the ratio of different allele combinations in the offspring, calculate a percentage chances of offspring showing a specific characteristic or just determine the phenotypes of the offspring
Completing a Punnett square allows you to predict the probability of different outcomes from monohybrid crosses