Crosses

In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?

• 0%
• 25%
• 50%
• 75%

Tags

NGSS.HS-LS3-3

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %
• 25%
• 50%
• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Two mice heterozygous for red eyes mate. What is the expected genotypic ratio of their offspring?

• 1 RR: 1 Rr: 1 rr
• 0 RR: 4 Rr: 0 rr
• 1 RR: 2 Rr: 1 rr
• 1 RR: 1 Rr

B=brown eyes
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.

• they have same phenotype and genotype
• they have different genotypes and phenotypes
• they have same phenotype but different genotypes
• they have same genotype but different phenotypes

Which of the following is NOT a genotype?

• heterozygous
• a trait
• Bb
• homozygous recessive

Which of the following alleles is homozygous (purebred) recessive?

• Tt
• tt
• TT
• t

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

• 0 %
• 25%
• 50%
• 75%

Which of the following is a phenotype?

• Aa
• red hair
• heterozygous
• DNA

Which of the following alleles is homozygous (purebred) recessive?

• Tt
• tt
• TT
• t

Aa is

• homozygous (purebred)
• heterozygous (hybrid)