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Iteru [2.4K]
3 years ago
10

By age 65, what percentage of adults are grandparents? 75 80 85 90

Biology
1 answer:
frutty [35]3 years ago
7 0
85% of adults are grandparents by age 65. This estimation has been made in the U.S. from the surveying of the elderly. So, the correct choice is the third option: 85. 

Let me know if you need further info. :)

                - Dotz
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Dafna11 [192]

Answer:

9/16

Explanation:

The cross was Aa Bb CC X Aa Bb cc

Because genes assort independently, we can analyze each of them separately in the cross, calculate the probability of getting offpsring with a dominant allele, and then multiply each of those probabilities to obtain the overall probability of having A_B_C_ progeny.

<u>A/a</u>

Aa x Aa ---> 3/4 A_, 1/4 aa

<u>B/b</u>

Bb x Bb ---> 3/4 B_, 1/4 bb

<u>C/c</u>

CC x cc ---> 1 C_

3/4 × 3/4 × 1 = 9/16 A_B_C_ offspring.

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