Extra credit.  The 4 choices below show the genotypes of 4 i…

Extra credit.  The 4 choices below show the genotypes of 4 individuals relative to 4 genes.  The “A gene” and the “B gene” shows complete dominance.  The “R gene” shows incomplete dominance.  The “T gene” is an X-linked gene.  Each gene influences only one trait, so there is no polygenic inheritance.      Genotype of individual 1: AA bb R3R4 XTY      Genotype of individual 2: aa Bb R3R5 XTXt      Genotype of individual 3: AA BB R1R1 XTXT      Genotype of individual 4: Aa BB R5R6 XtY Carefully examine these genotypes.  Which of the genes is multialleleic?  Select all correct choices. 

 Marine clamworms have flat fleshy appendages used for respi…

 Marine clamworms have flat fleshy appendages used for respiration.  This trait is controlled by a single gene with two alleles.  The dominant allele results in appendages with 3 lobes while the recessive allele results in appendages with 2 lobes. A female worm with three-lobed appendages mates with a male with two-lobed appendages.  What is the genotype of the female if some of the offspring have appendages with 2 lobes?  How do you know?

Examine the human karyotype below and answer the associated…

Examine the human karyotype below and answer the associated questions.        a.  Does this karyotype indicate a male or a female human?  How do you know?      b.  Does this karyotype indicate that a non-disjunction event (resulting in an aneuploidy) occurred?  Explain your answer.      c.  If the karyotype above is an aneuploidy, name the syndrome caused by the aneuploidy.