Monohybrid Cross Worksheet

genotypes made of the same alleles

different forms of genes for a single trait

gene that is always expressed

gene that is expressed only in the homozygous state

genotypes made of two different alleles

Choose all of the choices that are examples of dominant alleles.

Choose all of the choices that are examples of recessive alleles.

Choose all of the choices that are examples of homozygous dominant.

Choose all of the choices that are examples of homozygous recessive.

Choose all of the choices of genotpyes in which the dominant gene must show up.

Choose all of the choices of genotypes in which the recessive gene must show up.

Examine the Punnett squares and choice the ones that are correct.

What do the letters on the outside of the Punnett square stand for?

What do the letters on the inside of the Punnett square stand for?

Complete the Punnett square and shade all of the homozygous dominant offspring red. Shade all of the heterozygous offspring green. Do not shade any of the homozygous recessive offspring. (Click on the box to edit and then click on the dash at the top to change the color for shading. You can just shade one corner of each box.)

Complete the Punnett square and shade all of the homozygous dominant offspring red. Shade all of the heterozygous offspring green. Do not shade any of the homozygous recessive offspring. (Click on the box to edit and then click on the dash at the top to change the color for shading. You can just shade one corner of each box)

Complete the Punnett square and shade all of the homozygous dominant offspring red. Shade all of the heterozygous offspring green. Do not shade any of the homozygous recessive offspring. (Click on the box to edit and then click on the dash at the top to change the color for shading. You can just shade one corner of each box)

Complete the Punnett square and shade all of the homozygous dominant offspring red. Shade all of the heterozygous offspring green. Do not shade any of the homozygous recessive offspring. (Click on the box to edit and then click on the dash at the top to change the color for shading. You can just shade one corner of each box.)

Complete the Punnett square here for #19. Use H instead of S. Short hair, H is dominant over long hair, h.

One parent is Hh and one is hh. Be sure to type the parent alleles outside the box.

What percent of the offspring will have short hair? (HH or Hh)

What percent of the offspring will have long hair (hh)?

Complete the Punnett Square this time for two parents that are heterozygous. Use H for dominant short hair and h for recessive long hair again. Be sure to type the parent alleles outside the box.

What percent of the offspring will have short hair?

What percent of the offspring will have long hair?

Hornless (H) is dominant over horns (h) in cows. A homozygous hornless bull is mated with a homozygous horned cow. Complete the Punnett Square to show the possible offspring. Be sure to type the parent alleles outside the box.

What will be the genotypes of all of the offspring?

What will be the phenotypes of all of the offspring?