2nd November 2019


What does it mean to be a dominant trait?

Dominant traits are those that are expressed or seen when a heterozygous genotype is present. Heterozygous just means having two different alleles for a gene. One is usually dominant while one is recessive. Remember, recessive alleles are masked by dominant alleles.

Similarly, what human traits are dominant?

Human Traits: autosomal
1. Shape of face (probably polygenic)Oval dominant, square recessive
2. Cleft in chinNo cleft dominant, cleft recessive
3. Hair curl (probably polygenic) Assume incomplete dominanceCurly: homozygous Wavy: heterozygous Straight: homozygous
4. HairlineWidow peak dominant, straight hairline recessive

What are some dominant traits in humans?

Observable Human Characteristics
  • Earlobe attachment. If earlobes hang free, they are detached.
  • Tongue Rolling. Some people can curl up the sides of their tongue to form a tube shape.
  • Dimples. Dimples are small, natural indentations on the cheeks.
  • Handedness.
  • Freckles.
  • Curly hair.
  • Hand clasping.
  • Red/Green Colorblindness.

What are dominant genetic traits?

The terms dominant and recessive describe the inheritance patterns of certain traits. For a recessive allele to produce a recessive phenotype, the individual must have two copies, one from each parent. An individual with one dominant and one recessive allele for a gene will have the dominant phenotype.
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