Chapter 7 / 9 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 9 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 minRead a pedigree like an examiner
Deduce dominance, autosomal or X-linked inheritance, genotypes and probabilities from a pedigree.
About 7 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.
Spaced review
Remember this chapter
Save this chapter's 27 recall cards. We'll bring each one back just before you're likely to forget it, a few minutes a day.
Free account needed, so your cards follow you to any device. Notes and quick recall stay free without one.