Basic genetics

Which of the following shows a genotype that would be considered homozygous? Choose all that apply.

• GG

• gg

• Gg

• Bb

• bb

In guinea pigs, the allele for short hair is dominant. If all the guinea pigs are born short haired what are the possible genotypes of the parents? (There are two possible combinations.)

• Ss + Ss

• SS + SS

• SS + Ss

• ss + ss

Which of the following genotypes is a purebred?

• Bb
• Gg
• bb
• Dd

T - tall and t = short
In the punnett square below, what belongs in the missing square

• tt
• Tt
• Bb
• TT

AA

• Homozygous dominant

• Homozygous recessive

• Heterozygous

Which is a true statements about this picture?

• Brown is recessive
• Brown is dominant
• Blue is dominant
• Blue is codominant

According to this punnett square shown, the recessive trait is:

• Wrinkled peas

• Green pods

• Yellow pods

• Purple seeds

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

• Purple
• Green
• GG
• gg

Jj

• homozygous dominate

• homozygous recessive

• heterozygous

How do we write DOMINANT alleles?

• Capital letters

• Lower case