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Dominant and Recessive. Dominant – the trait we see (expressed with capital letter, A) Recessive – trait that is masked (expressed with lower case letter, a) Which is better, dominant or recessive?. Dominance. Organism with two of the same allele – homozygous AA, aa

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Dominant and recessive
Dominant and Recessive

  • Dominant – the trait we see (expressed with capital letter, A)

  • Recessive – trait that is masked (expressed with lower case letter, a)

  • Which is better, dominant or recessive?


Dominance
Dominance

  • Organism with two of the same allele – homozygous

    • AA, aa

  • Organism with two different alleles – heterozygous

    • Aa

    • Dominant trait observed (notice the dominant allele)



Heterozygous hybrid
Heterozygous (hybrid)

Different

Hh

Rr


Genotype
Genotype

Allele makeup of an individual

Tt T T tt

RR Rr rr


Phenotype
Phenotype

Observable characteristics of an individual


Predicting traits
Predicting traits

  • Punnett Squares


Practice
Practice

A Tt (tall) plant is crossed with a tt (short plant). What percentage of the offspring will be tall?


A green pea sead (gg) is crossed with a hybrid yellow seed (Gg). What will be the genotypic and phenotypic ratios of the offspring?


A heterozygous plant ( (Gg). What will be the genotypic and phenotypic ratios of the offspring? Tt) is crossed with another heterozygous (Tt) plant. What percentage of the offspring will be tall?


In guinea pigs, rough coats are dominant over smooth coats. An Rr guinea pig is crossed with an Rr guinea pig.

What are the chances of each genotype and phenotype?

Include genotypic and phenotypic ratios.


Dihybrid cross
Dihybrid Cross An

  • a cross between two individuals looking at two different traits

    For example: GGbb/ggBb or RRYY/rryy


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