9th grade Multiple alleles: ABO blood types worksheet

Multiple alleles: ABO blood types

Grade 9 Science Worksheet - Building Confidence

Circle the best answer.

1. Read this first

   Genotype card (model)

   genotype	rule
   IAIB	IA and IB are codominant

2. 1.

   Bo reads a genotype card for the ABO gene. Which blood type does the genotype IAIB give?

   • Type AB (both alleles show)
   • Type O (neither IA nor IB is dominant)
   • A type halfway between A and B
   • Type A (IA hides IB)
3. 2.

   Esme reads a genotype card for the ABO gene. Which blood type does the genotype IBi give?

   • Type A (the i allele makes type A)
   • Type B (IB is dominant to i)
   • Type O (i hides IB)
   • Type AB (both alleles show)
4. 3.

   Jun fills a Punnett square for a model ABO cross. Which genotype goes in the blank box?

   • IBi (one IB allele, one i allele)
   • IAi (one IA allele, one i allele)
   • IAIA (two IA alleles)
   • IAIB (one IA allele, one IB allele)
5. 4.

   Kira fills a Punnett square for a model ABO cross. Which genotype goes in the blank box?

   • IAIB (one IA allele, one IB allele)
   • IBi (one IB allele, one i allele)
   • IBIB (two IB alleles)
   • ii (two i alleles)
6. 5.

   Luz fills a Punnett square for a model ABO cross. Which genotype goes in the blank box?

   • IAi (one IA allele, one i allele)
   • i (one i allele)
   • IAIA (two IA alleles)
   • ii (two i alleles)

7. Table

   ABO gene card (model), 2 rows. Columns: item, note. Row 1: alleles in the population, IA, IB and i. Row 2: one genotype, a pair of alleles.

8. 6.

   Noah reads a card about the ABO gene. Which statement is right?

   • Three alleles in the population, two in each genotype
   • Two alleles in each genotype, and two in the population
   • Two alleles in the population, and two in each genotype
   • Three alleles in each genotype, and three in the population

9. Rules card (model)

   item	rule
   IA and IB	each dominant to i
   i	recessive allele

10. 7.

    Pia reads a rules card. Why does a genotype need two i alleles to give type O?

    • The i allele is recessive, so it shows only as a pair
    • The i allele is dominant, so one i is enough
    • The i allele is codominant with IA, so both show
    • Two i alleles blend into the type O look

11. ABO genotypes (model)

    type	genotypes
    A	IAIA or IAi
    B	IBIB or IBi
    AB	IAIB
    O	ii

12. 8.

    Ren reads a table of ABO genotypes. How many genotypes give type A?

    • 1, just IAIA
    • 3, IAIA, IAi and IAIB
    • 2, IAIA and IAi
    • 4, one for each type

13. Table

    Model plant card (model data, not a real plant), 2 rows. Columns: item, note. Row 1: alleles, P (purple), Y (yellow) and w (white). Row 2: one genotype, a pair of alleles.

14. 9.

    Tala reads a card for a model plant. Which genotype can one plant carry?

    • PPYY (four alleles)
    • PYw (three alleles)
    • Yw (two alleles)
    • w (one allele)

15. Type A genotypes (model)

    genotype	type
    IAIA	A
    IAi	A

16. 10.

    Zee reads a table. IAIA and IAi are both listed as type A. What does that show?

    • Two different genotypes can give one type
    • Type A needs IAIA, so IAi is a mistake
    • The i allele turns IAi into type O
    • Type A is really two different types