Blended and both-showing traits
Grade 9 Science Worksheet - Building Confidence
Circle the best answer.
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?
- Pink, from one red and one white allele
- Red, because the red allele hides the white allele
- White, because the side parent has white flowers
- Red and white patches, because both alleles show
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
- White, from two white alleles
- Red, because the top parent passes on R
- Red and white patches, because both alleles show
Esme reads a model square for a roan parent crossed with a red parent. Which genotype fills the top-right box?
- RR (two red alleles)
- W (one white allele)
- WW (two white alleles)
- RW (one red and one white allele)
Read this first
A snapdragon cross (model)
plant genotype flower color red parent RR red white parent WW white offspring RW pink Jun reads a snapdragon cross card. Which pattern does it show?
- Blending: the alleles mix and stay mixed
- Incomplete dominance: the offspring look in between the parents
- Complete dominance: one allele hides the other allele
- Codominance: both alleles show side by side
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 Kira reads a model cattle cross card. Which word describes the offspring coat?
- Segregation: the alleles split into two groups
- Codominance: both alleles show at the same time
- Incomplete dominance: one mixed color between the parents
- Complete dominance: the red allele hides the white allele
A pea flower cross (model)
plant genotype flower color parent one VV violet parent two vv white offspring Vv violet Luz reads a pea cross card. Which pattern does it show?
- Blending: the colors mix, so Vv should look pale
- Incomplete dominance: Vv looks in between the parents
- Complete dominance: V hides v, so Vv looks violet
- Codominance: Vv shows violet and white patches
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 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
Hairs counted on one roan calf (model data)
hair color hairs counted red 52 white 48 pink 0 Noah counts 100 hairs on a roan calf. What does the count show?
- Each hair is a pink blend, since 52 and 48 are close
- Some red hairs faded to white over time
- Red is dominant, since 52 is more than 48
- Each hair is red or white, and none is pink
Three snapdragon plants (model)
plant flower color X red Y pink Z white Pia reads a snapdragon card. Plant Y has pink flowers. Which genotype does it have?
- R (a single red allele)
- RW (one red and one white allele)
- WW (two white alleles)
- RR (two red alleles)
Ren reads the filled square for two pink snapdragons. Which list matches the four boxes?
- 3 red or pink, 1 white
- 4 pink, since both parents are pink
- 2 red, 2 white
- 1 red, 2 pink, 1 white