During the mating season, a certain type of lizard will bob its head up and down while displaying a colourful throat patch.  These lizards prefer to find mates that bob their heads fast (dominant) instead of slow (recessive), and that have a red throat patch (dominant) instead of a yellow one (recessive).  A male lizard heterozygous for head bobbing and homozygous dominant for throat patch mates with a female also heterozygous for head bobbing but homozygous recessive for throat patch. a) give the alleles (using proper notation) and the genotypes of the parent lizards. [2] b) show a Punnett Square for this cross. Remember: find the gametes first, so you know how big to make the Punnett Square (hint: it is NOT 4 x 4!) [2] c) What ratio of offspring have the preferred fast/red phenotype? [1] d) What percent of the young will not get mates because they have slow head bobbing and yellow throats? [1] e) what percent of the young will have trouble finding mates because they lack one of the dominant traits? [1]

Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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During the mating season, a certain type of lizard will bob its head up and down while displaying a colourful throat patch.  These lizards prefer to find mates that bob their heads fast (dominant) instead of slow (recessive), and that have a red throat patch (dominant) instead of a yellow one (recessive). 

A male lizard heterozygous for head bobbing and homozygous dominant for throat patch mates with a female also heterozygous for head bobbing but homozygous recessive for throat patch.

  1. a) give the alleles (using proper notation) and the genotypes of the parent lizards. [2]
  2. b) show a Punnett Square for this cross. Remember: find the gametes first, so you know how big to make the Punnett Square (hint: it is NOT 4 x 4!) [2]
  3. c) What ratio of offspring have the preferred fast/red phenotype? [1]
  4. d) What percent of the young will not get mates because they have slow head bobbing and yellow throats? [1]
  5. e) what percent of the young will have trouble finding mates because they lack one of the dominant traits? [1]
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