Analyze It
Tom and Alice are the parents of four children. Tom has earlobes that are not attached to the side of his head, which is a dominant trait. Alice has earlobes that are attached, which is a recessive trait. Use the two Punnett squares ("E" represents the dominant earlobe gene, and "e" represents the recessive earlobe gene) to answer the following questions.
Two Punnett squares, side by side. The first Punnett square shows one parent with two dominant genes (represented by two capital E's) and one parent with two recessive genes (represented by two lower-case e's), and four offspring, each with one dominant and one recessive gene (represented by a capital E and a lower-case e). The second Punnett square shows one parent with one dominant gene and one recessive gene (represented by a capital E and a lower-case e) and one parent with two recessive genes (represented by two lower-case e's), and four offspring, two with one dominant gene and one recessive gene (represented by a capital E and a lower-case e) and two with two recessive genes (represented by two lower-case e's).
What must be true about the earlobes of Tom's parents?
What must be true about the earlobes of Alice's parents?
Which Punnett square allows for the possibility that Tom and Alice's children have attached earlobes?
What is the likelihood that the children in square 1 will have earlobes that are not attached?
What is the likelihood that the children in square 2 will have earlobes that are not attached?
Think About It
What does probability have to do with heredity?
Answers
Answer:
Hope this helps
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1. The truth about the earlobes of Alice's parents is that Tom's earlobes are not attached to the side of his head, which is a dominant trait and Alice's earlobes are attached, which is a recessive trait.
2.The first Punnett square allows for the possibility that Tom and Alice's children have attached earlobes. It shows one parent with two dominant genes (represented by two capital E's) and one parent with two recessive genes (represented by two lower-case e's), and four offspring, each with one dominant and one recessive gene (represented by a capital E and a lower-case).
3.In square one, four offspring, each with one dominant and one recessive gene (represented by a capital E and a lower-case) are likely to have earlobes that are not attached.
4.In square 2,four offsprings, two with one dominant gene and one recessive gene (represented by a capital E and a lower-case e) and two with two recessive genes (represented by two lower-case e's) are likely to have earlobes that are not attached.
5.probability is very useful in genetics which states that the probability of two (or more) independent events which are occurring together can be calculated by multiplying the individual probabilities of the events.