The formation of gametes


1. Kelp, a large, multicellular type of algae, has air bladders in the blades to help them float near the surface of the ocean where they can get more sunlight. Assume that having many air bladders (M) is a dominant trait. What gametes would be produced by a heterozygous individual?
 

 
 

What gametes would be produced by a homozygous dominant individual?
 

 


2. In humans, sickle cell anemia is a disease caused by a mutation of a single locus gene which codes for an important blood protein. The allele for the normal protein (S) is dominant to that for the one causing sickle cell anemia. What gametes would be produced by an individual who suffers from sickle cell anemia?
 

 
 

What gametes would be produced by individuals resulting from a SS x ss cross?
 

 


3. In areas of the very deep and damp southeastern United States lives what is, for all intents and purposes, a giant flying cockroach known as a Palmetto bug. Assume that long antennae (L) are dominant to short antennae and that normal wings (N) are dominant to bent ones. What gametes will be produced by an individual that is homozygous dominant for antennae and heterozygous for wings?
 


 







What gametes will be produced by an individual that is heterozygous for antennae and homozygous recessive for wings?
 


 







4. In horses, the color black is due to a dominant allele (B) and chestnut color is due to the recessive allele (b). The trotting gait is due to a dominant allele (T) and the pacing gait to the recessive (t). What will be the gametes produced by a homozygous black pacer?
 

 
 
 

Suppose we cross the black pacer above with a homozygous chestnut trotter. What will be the gametes produced by the F1 generation?
 


 







5. Suppose you are designing a new Jurassic Park and you would like to have the crowd drawing presence of Velociraptor without the danger of having your crowds eaten. You have managed to come up with two varieties, very aggressive (A), which is apparently a dominant trait in Velociraptors, and non-aggressive. They also come in two colors, red (R), which is dominant, and green. At the moment you have a green female that is homozygous dominant for aggression and a non-aggressive male that is homozygous dominant for color. What gametes will be produced by the male and female?

Female:
 


 





Male:
 


 







What gametes will be produced by the F1 generation of these two Velociraptors (providing of course that the female doesn't dismember the male before mating)?
 


 







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