Download Monohybrid inheritance - The Grange School Blogs

Monday 17th October
COPY LO:
Understand how genetic crosses are
represented and how a single gene is
inherited.
Starter
Read through table on Page 115 of textbook
BATS
• predict the results of monohybrid
crosses involving dominant, recessive
and co-dominant alleles
VERY IMPORTANT - always
abide by these rules - DO NOT
TAKE SHORT CUTS
WHAT DOES
MONOHYBRID
MEAN?
MONOHYBRID
means the
inheritance of a
single gene.
What is a pure bred organism?
It is one that are
homozygous for a
character
They have been bred
for many generations
and are constant for
that particular gene
When organisms are crossed - the
offspring are known as the first filial, or
F1 generation.
If two of the F1 generation are bred/
crossed, the offspring is known as the
second filial or F2 generation
In pea plants, the allele for tall stems is dominant to the allele for short
stems. If two tall-stemmed plants (both heterozygous) are crossed, what
percentage of the offspring will be short-stemmed plants?
Parental phenotype
Parental genotype
Parental gametes
Offspring genotype
Offspring phenotype
1. Answer Q 1-2 on Page 116
Do Application
on Page 116 117
Work for Thursday and Holiday Homework
1. Revise - meiosis - topic 8.4 in AS
Biology
2. Worksheet - do Q 1-4
2. Read Pages 118 - 120 of textbook then
answer all summary questions and do
application on page 120
3. Make a note of any things you do not
understand
Other useful Sources
http://www.youtube.com/watch?v=NgXOLU3uiHg - summary of Mendelian inheritance
http://www.biologymad.com/master.html?http://www.biologymad.com/A2Biology.htm The best A
Level Biology Website
References
Glenn Toole, Susan Toole (2008). A2 Biology. Cheltenham: Nelson