Grade 9 Genetics & inheritance worksheet

What is on the worksheet

1. In the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 704 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

2. In pea plants, the allele for round seeds (R) is dominant over the allele for wrinkled seeds (r). Two plants, RR × rr, are crossed. What percentage of the offspring are expected to show round seeds?

3. In the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 408 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

4. In the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 660 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

5. Using base-pairing rules, which sequence pairs with the DNA strand TGATCGTCA, read base by base in the same order?

   1. TGATCGTCA
   2. ACTAGCAGT
   3. ACUAGCAGU
   4. ACTAGCATT

6. In the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 496 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

7. In a canonical double-stranded DNA sample, adenine is 40% of all bases. Find the guanine percentage, assuming A = T and C = G. Round to 3 decimal places if needed. Answer in %.

8. A fictional diploid organism has 20 chromosomes in a normal somatic nucleus. In the standard meiosis model, how many chromosomes are in a haploid gamete? Round to 3 decimal places if needed.

9. Why need four offspring not include exactly one aa in an Aa × Aa cross?

10. A fictional diploid organism has 40 chromosomes in a normal somatic nucleus. In the standard meiosis model, how many chromosomes are in a haploid gamete? Round to 3 decimal places if needed.

11. In a canonical double-stranded DNA sample, adenine is 16% of all bases. Find the guanine percentage, assuming A = T and C = G. Round to 3 decimal places if needed. Answer in %.

12. Using base-pairing rules, which sequence pairs with the DNA strand CAAGTTTCA, read base by base in the same order?

    1. GTTCAAAGG
    2. CAAGTTTCA
    3. GTTCAAAGT
    4. GUUCAAAGU

13. In the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 300 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

14. In the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 108 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

15. In the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 220 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

16. A DNA template strand reads AGAGACTAC. Which mRNA sequence is transcribed from it, read base by base in the same order?

    1. UCUCUGAUG
    2. TCTCTGATG
    3. UAUCUGAUG
    4. AGAGACTAC

17. In the simple Aa × Aa inheritance model with independent outcomes, the probability of aa is 1/4. Among 324 offspring, find the expected aa count, not a guaranteed outcome. Round to 3 decimal places if needed.

18. Using base-pairing rules, which sequence pairs with the DNA strand CACGAT, read base by base in the same order?

    1. GTGCTA
    2. GTGCCA
    3. CACGAT
    4. GUGCUA

19. Using base-pairing rules, which sequence pairs with the DNA strand TTTTATA, read base by base in the same order?

    1. AAAATAT
    2. AAAAUAU
    3. AATATAT
    4. TTTTATA

20. In pea plants, the allele for yellow seeds (Y) is dominant over the allele for green seeds (y). Two plants, Yy × yy, are crossed. What percentage of the offspring are expected to show yellow seeds?