Punnett Square

Which of the following genotypes is homozygous recessive?

• RR
• Rr
• rr
• None of the Above

Tt is-

• homozygous dominant
• homozygous recessive
• heterozygous
• none of these

Tags

NGSS.HS-LS3-1

Purple is dominant to white. A heterozygous purple flower is crossed with a white flower. What are the genotypes and phenotypes of the offspring?

• 100% Pp (purple)
• 50% Pp (purple); 50% pp (white)
• 75% Pp (purple); 25% pp (white)
• 25% PP, 50% Pp, 25% pp
  75% purple, 25% white

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Which is the correct phenotype for this organism?

• BB
• blue
• green
• bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If green is dominant over purple, then what is the genotype for this individual?

• Purple
• Green
• GG
• gg

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Brown fur color is dominant over black fur color. Which of the following is the actual genotype of ALL of the offspring in the next generation of this cross for fur color?

AA x aa

• AA

• Aa

• Black Fur

• brown fur

Tags

NGSS.HS-LS3-1

B - black, b - brown.  Two black mice mate and have some black and some brown mice.  What is the genotype of the parents?

• BB x Bb
• BB x bb
• Bb x Bb
• Bb x bb

Tags

NGSS.HS-LS3-1

One reason for Mendel's success with genetic studies of peas was that he

• used only hybrid pea plants
• used peas with large chromosomes
• studied large numbers of offspring
• discovered the sources of variation in peas

Tags

NGSS.HS-LS3-3

A cross between two tall garden pea plants produced 314 tall plants and 98 short plants. What genotypes are the parents?

• TT and tt
• TT and Tt
• Tt and Tt
• TT and TT

Tags

NGSS.HS-LS3-1

In screech owls, red feathers are dominant over gray feathers. If two heterozygous red-feathered owls are mated, what percentage of their offspring would be expected to have red feathers?

• 25%
• 50%
• 75%
• 100%

Tags

NGSS.HS-LS3-3