Chapter 7 / 8 short lessons
Inheritance and phenotype
Build genetic diagrams from gametes, extend them to two genes and explain why genotype is not the whole phenotype.
H1 Biology / 8876 / 2027 syllabus
What do you think?
A dihybrid cross always produces 9:3:3:1. Is that a safe rule?
Lessons
0 of 8 marked as readPut alleles at a locus
Use inheritance vocabulary and explain allele transmission through gametes.
About 5 minRead the heterozygote first
Distinguish complete dominance, codominance and incomplete dominance as preparation for dihybrid problems.
About 5 minBuild a two-gene cross from gametes
Solve dihybrid crosses with explicit independent-assortment and dominance assumptions.
About 6 minTwo genes with an intermediate phenotype
Solve a dihybrid cross involving incomplete dominance or codominance.
About 6 minMore alleles in the population, two in a person
Solve a dihybrid problem involving multiple alleles and codominance.
About 6 minTrack the X chromosome and a second gene
Explain sex linkage and solve a dihybrid cross combining an X-linked and an autosomal locus.
About 6 minUse a recessive tester to reveal gametes
Solve single- and two-locus test crosses and interpret finite offspring samples.
About 5 minSame genetic potential, different development
Explain environmental effects on phenotype, including honeybee diet and differentiation.
About 5 minWhat you will be able to do
- Use inheritance terms precisely.
- Solve two-gene crosses with clear assumptions and denominators.
- Explain environmental effects on phenotype, including honeybee development.