9th grade Blended and both-showing traits worksheet

Blended and both-showing traits

Grade 9 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   Ari reads a Punnett square for a red-flowered snapdragon crossed with a white-flowered one. What color is the flower in the top-left box?

   • Red, because the red allele hides the white allele
   • White, because the side parent has white flowers
   • Pink, from one red and one white allele
   • Red and white patches, because both alleles show
2. 2.

   Bo reads a square for two pink snapdragons. What color is the flower in the empty bottom-right box?

   • Pink, because both parents are pink
   • Red and white patches, because both alleles show
   • Red, because the top parent passes on R
   • White, from two white alleles
3. 3.

   Esme reads a model square for a roan parent crossed with a red parent. Which genotype fills the top-right box?

   • W (one white allele)
   • WW (two white alleles)
   • RW (one red and one white allele)
   • RR (two red alleles)

4. Read this first

   A snapdragon cross (model)

   plant	genotype	flower color
   red parent	RR	red
   white parent	WW	white
   offspring	RW	pink

5. 4.

   Jun reads a snapdragon cross card. Which pattern does it show?

   • Incomplete dominance: the offspring look in between the parents
   • Complete dominance: one allele hides the other allele
   • Codominance: both alleles show side by side
   • Blending: the alleles mix and stay mixed

6. A cattle cross (model)

   animal	genotype	coat
   red parent	RR	all red hairs
   white parent	WW	all white hairs
   offspring	RW	red hairs and white hairs together

7. 5.

   Kira reads a model cattle cross card. Which word describes the offspring coat?

   • Codominance: both alleles show at the same time
   • Incomplete dominance: one mixed color between the parents
   • Segregation: the alleles split into two groups
   • Complete dominance: the red allele hides the white allele

8. A pea flower cross (model)

   plant	genotype	flower color
   parent one	VV	violet
   parent two	vv	white
   offspring	Vv	violet

9. 6.

   Luz reads a pea cross card. Which pattern does it show?

   • Complete dominance: V hides v, so Vv looks violet
   • Codominance: Vv shows violet and white patches
   • Blending: the colors mix, so Vv should look pale
   • Incomplete dominance: Vv looks in between the parents

10. Three cattle coats (model)

    genotype	coat	hairs
    RR	red coat	all red hairs
    RW	roan coat	red hairs and white hairs mixed
    WW	white coat	all white hairs

11. 7.

    Milo reads a model coat card. A calf has genotype RW. What do its hairs look like?

    • White hairs alone, because W hides R
    • Red hairs and white hairs, mixed together
    • Pink hairs, a blend of red and white
    • Red hairs alone, because R hides W

12. Hairs counted on one roan calf (model data)

    hair color	hairs counted
    red	52
    white	48
    pink	0

13. 8.

    Noah counts 100 hairs on a roan calf. What does the count show?

    • Each hair is red or white, and none is pink
    • Some red hairs faded to white over time
    • Each hair is a pink blend, since 52 and 48 are close
    • Red is dominant, since 52 is more than 48

14. Three snapdragon plants (model)

    plant	flower color
    X	red
    Y	pink
    Z	white

15. 9.

    Pia reads a snapdragon card. Plant Y has pink flowers. Which genotype does it have?

    • WW (two white alleles)
    • RW (one red and one white allele)
    • R (a single red allele)
    • RR (two red alleles)
16. 10.

    Ren reads the filled square for two pink snapdragons. Which list matches the four boxes?

    • 1 red, 2 pink, 1 white
    • 4 pink, since both parents are pink
    • 3 red or pink, 1 white
    • 2 red, 2 white