Dominant and recessive
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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

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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)


Homozygous pure bred

Homozygous (pure bred)

Same

HH

hh


Heterozygous hybrid

Heterozygous (hybrid)

Different

Hh

Rr


Genotype

Genotype

Allele makeup of an individual

Tt T Ttt

RRRrrr


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?


Dominant and recessive

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


Dominant and recessive

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


Dominant and recessive

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

  • a cross between two individuals looking at two different traits

    For example: GGbb/ggBb or RRYY/rryy


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