In cats, the dominant o allele of the x-iinked orange gene is required to produce orange fur, the recessive o allele of this gene yields black fur. a. tortoiseshell cats have coats with patches of orange fur alternating with patterns of black fur. approximately 90% of all tortoiseshell cats are females. what type of crosses would be expected to produce female tortoiseshell cats? b. suggest a hypothesis to explain the origin of male tortoiseshell cats. c. calico cats (most of which are females) have patches of white, orange, and black fur. suggest a hypothesis for the origin of calico cats.

The picture shows a location in india that is very dry and arid. notice the tall mountains in the background; you can find high amounts of vegetation on the other side of the mountains. which statement is most likely true for this area?

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.

The polio virus can cause skeletal muscle paralysis by destroying neuron cell bodies. what area of the spinal cord is destroyed