Assignment: Inheritance Background: The images above shows an individual with a

Question

Assignment: Inheritance

Background: The images above shows an individual with a common thumb variant (recessive trait) and one with brachydactyly type D (dominant trait). The reduced length and increased girth of the distal phalanx in brachydactyly type D has to do with a mutation on HOXD13 (part of the hoxD gene cluster on Chromosome 2) that effects its pattern of development.

Your question: Considering that brachydactyly type D is controlled by a dominant allele, will it replace the common recessive thumb allele over time? As part of your answer you must make use of Mendel's laws of inheritance.

1. Make sure you explain why you think the dominant allele will or will not replace the recessive allele. You will have to look over Mendel's laws of inheritance to answer this question correctly.

2. Student will cite their work.

Explanation / Answer

As Mendel's law of inheritance says that always the dominant charcter is expressed phenotypically the ressecive allele is suppressed by the dominant allele even in the heterozygous condition. Say for example in the Paisum sativum experiment in monohybrid cross we got (TT Tt tT tt) four alleles here we have both homozygous dominant condition and homozygous recessive condition and also the heterozygous condition. In homozygous dominant we have both the dominant character which is tall we have tall plant. in both the heterozygous character we have both dominant and the recessive allele but the expressed character is the tall plant the reccessive is suppressed by the dominant allele and the homozygous reccessive allele give dwarf plant since it does not have any dominant allele.

so always the recessive allele will be suppressed by the dominant allele only the dominant character will express phenotypically. Yes the dominant allele will replace the common recessive thumb allele.

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