Dihybrid Practice Answers-22

In dogs the allele for brown is dominant over the allele for blonde fur, the allele for short fur is dominant over the allele for long fur.

What fraction of the offspring from a Bbff x BBFf cross would be expected to be HETEROZYGOUS FOR BOTH TRAITS?

• 9/16

• 3/16

• 1/16

• 4/16

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-3

TTYy pea plant is crossed with a Ttyy pea plant, WHAT PERCENTAGE OF THE OFFSPRING WILL BE EXPECTED TO HAVE THE TTYy ALLELE COMBINATION?

• 9/16

• 3/16

• 4/16

• 1/16

Tags

NGSS.HS-LS3-3

If a brown cocker spaniel which is heterozygous for curly fur is crossed with a heterozygous black cocker spaniel with straight fur, WHICH OF THE FOLLOWING GENOTYPIC RATIOS CAN BE EXPECTED?

• 4 BbCc : 4 bbCc : 4 Bbcc : 4 bbcc

• 9 BbCc : 3 bbCc : 3 Bbcc : 1 bbcc

• 6 BbCc : 6 bbCc : 2 Bbcc : 1 bbcc

• 10 BbCc : 1 bbCc : 4 Bbcc : 1 bbcc

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Which of the following outcomes would be expected from the crossing of BbFf (male) x bbFF (female)?

• 100% black fur

• 100% white fur

• 100% short fur

• 100% long fur

Tags

NGSS.HS-LS3-1

No hooked nose is dominant to having a hooked nose. If I crossed a homozygous recessive person with another homozygous recessive person...

A. What is the offspring genotypic and phenotypic percentages?

B. Suppose a member of the Royalty secretly married a peasant. Would it be possible for them to have any children with non hooked noses?

• A. 50% hh 50% Hh

  50% no hook 50% hooked nose

  B. yes because the peasant would pass a dominant allele to the offspring (hh x HH or hh x Hh)

• A. 100% hh

  100% hooked nose

  B. yes because the peasant would pass a dominant allele to the offspring (hh x HH or hh x Hh)

• A. 50% HH 50% Hh

  100% hooked nose

  B. no because the peasant would pass a recessive allele to every offspring

• A. 50% hh 50% Hh

  50% no hook 50% hooked nose

  B. no because the hooked nose gene will be masked by the recessive allele

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Can the offspring have the extra finger? How can you prove it?

• Ee x Ee

  The cross shows that 50% of the time the offspring will have the dominant allele.

• ee x EE

  The cross shows that 100% of the time the offspring will have the dominant allele.

• ee x Ee

  The cross shows that 50% of the time the offspring could inherit one copy of the dominant allele.

• ee x Ee

  The cross shows that 50% of the time the offspring could inherit two copies of the recessive alleles.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

A breeder mates two rabbits: one that is heterozygous for both traits with one that is a hybrid for white color and has short ears.

A. How many different genotypes will be present?

B. What is the change that the offspring will be BLACK WITH LONG EARS?

• WwEe x Wwee

  A. There will be 6 different genotypes present from this cross

  B. 2/16 will be black with long ears (wwEe)

• WWEe x WwEe

  A. There will be 9 different genotypes present from this cross

  B. 4/16 will be black with long ears (wwEe)

• WwEe x Wwee

  A. There will be 16 different genotypes present from this cross

  B. 3/16 will be black with long ears (wwEe)

• Wwee x Wwee

  A. There will be 12 different genotypes present from this cross

  B. 1/16 will be black with long ears (wwEe)

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Which of the following traits would not be seen in the offspring of the cross shown?

• Purple kernel color

• Yellow kernel color

• Smooth kernel shape

• Wrinkled kernel shape

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the expected phenotypic ration of the offspring in the cross between two cats heterozygous for both traits?

• 6 tabby/folded : 6 tabby/upright : 2 solid/folded : 2 solid/upright

• 4 tabby/folded : 4 tabby/upright : 4 solid/folded : 4 solid/upright

• 9 tabby/folded : 3 tabby/upright : 3 solid/folded : 1 solid/upright

• 10 tabby/folded : 1 tabby/upright : 4 solid/folded : 1 solid/upright

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

A parent stem cell is given in the picture.  

What are the possible allele combinations if this cell was to undergo meiosis?

• TT, Tt, AA, Aa

• TA, Ta, tA, ta

• TA, TA, tA, ta

• Tt, Tt, Aa, Aa

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2