What does a monohybrid cross predict, and how?
It predicts inheritance of one characteristic by combining the alleles each parent can pass on to find possible offspring genotypes.
AQA GCSE Combined Science: Trilogy (8464) — Biology — Foundation · 4.6.1.4
Revise AQA GCSE Combined Science: Trilogy (8464) — Biology — Foundation specification point 4.6.1.4, Genetic inheritance, with free active-recall flashcards. Flip through the set or review every question and answer below.
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What does a monohybrid cross predict, and how?
It predicts inheritance of one characteristic by combining the alleles each parent can pass on to find possible offspring genotypes.
How does a Punnett square show possible offspring genotypes?
Possible parental alleles are placed along the edges; each cell shows a possible offspring genotype.
How are offspring genotypes used to find a phenotypic ratio?
Use the genotypes to predict the offspring phenotypes, then calculate their ratio.
With one dominant and one recessive allele, what phenotypic ratio is predicted from crossing two heterozygous parents?
3:1 dominant to recessive.
With one dominant and one recessive allele, what phenotypic ratio is predicted from crossing a heterozygous parent with a homozygous recessive parent?
1:1 dominant to recessive.
What is inheritance?
The transmission of genetic information from one generation to the next.
What does an organism inherit from its parents?
Alleles of genes.
What is an organism’s genotype?
Its genetic make-up, including the alleles it has.
What is an organism’s phenotype?
Its observable features.