Genetics Variation of Traits
Scenario
First Cross: Two pea plants were crossed, one had yellow seeds and one had green seeds. They
produced 508 seeds that were all yellow and no green.
Second Cross:The 508 yellow seeds were planted and allowed to self-pollinate (breed on their own
between plants) and produced 760 yellow seeded plants and 240 green seeded plants.
Scientific Explanation Based on the scenario on the first cross...
1. Make a key. Determine which trait must be dominant and recessive. Use a letter to represent
the two traits (dominant trait= capital letter and recessive trait=lowercase letter)
2. Determine the genotype of the parents.
3. Complete a punnett square.
4. Show genotype and phenotype ratios.

Which of the following scenarios is an example of the bottleneck effect? answers a in south africa, much of the afrikaner population is descended from a small number of dutch colonists. in this population, this is an unusually high frequency of pseudoxanthoma elasticum (pxe), an elastic tissue disorder. b four white-tailed deer are introduced to a park in finland. thirty years after their introduction scientists compare the genes in the population and find that there is no variation. c during the industrial revolution, london's air became filled with soot. as a result, birds started eating more of the lighter moths because they were easier to spot than their darker counterparts. over time, the moth population changed so that there were more darker moths than lighter ones. d 10% of the population of american alligators in an area have the recessive trait albinism. a massive flood results in the death of 80% of the population. of the remaining population, 60% have the recessive trait of albinism.

Explain why phospholipid molecules form a bilayer. (3 marks)

Listed in the item bank are some key terms and expressions associated with the categories seen in the venn diagram. to find out more information about items, some have more details available when you click on them. drag and drop each item onto the proper area of the diagram. if an item describes more than one category, be sure to place it in the overlapping space. viruses are tiny infectious pathogens that cause many different diseases, such as polio, and the flu. though they are similar to one celled organisms in some ways, in many ways they are very different. use the venn diagram below to show the similarities and differences between viruses and living organisms.