DNA And Punnett Squares Question Preview (ID: 38154)


Review DNA Vs. RNA And Punnett Squares. TEACHERS: click here for quick copy question ID numbers.

Brown eyes are dominant to blue eyes. What are the parent's genotypes if their kids are 100% heterozygous?
a) Parent 1 is homozygous dominant and parent 2 is homozygous recessive
b) Parent 1 is homozygous recessive and parent 2 is heterozygous
c) Both parents are heterozygous
d) Parent 1 is homozygous dominant and parent 2 is heterozygous

Brown eyes are dominant to blue eyes. Widow's peak is dominant to a straight hairline. Both Mark and Anne have blue eyes and are heterozygous for widow's peak. What are the chances they will have kids that have blue eyes with a straight hairline?
a) 75%
b) 2/4
c) 1/16
d) 4/16

Dimples (D) are dominant to not having dimples. Two parents (who both have dimples) have 4 kids; 3/4 kids have dimples and 1/4 does not have dimples. What are the parents' genotypes?
a) DD and dd
b) Dd and Dd
c) Dd and DD
d) dd and Dd

Purple flowers (P) are dominant to white flowers. Tall stems (T) are dominant to short stems. What is the phenotype of a plant that is ppTT?
a) purple flower, short stem
b) purple flower, tall stem
c) white flower, short stem
d) white flower, tall stem

Which of the following is true about RNA?
a) It is double stranded
b) It has the nitrogen bases A, U, C, G
c) There are only two types of RNA - mRNA and tRNA
d) The RNA doesn't leave the nucleus.

Purple flowers (P) are dominant to white flowers. Tall stems (T) are dominant to short stems. If a plant is heterozygous for purple flowers and has short stems, what would the genotype be?
a) PpTT
b) ppTt
c) ppTT
d) Pptt

Which of the following does NOT describe a molecule of DNA?
a) It has the nitrogen base uracil
b) It is double stranded.
c) It has the sugar deoxyribose.
d) It stays in the nucleus and provides all of the information on traits and proteins for the organism

Having dimples (D) is dominant to not having dimples. Brown eyes (B) are dominant to blue eyes. Mike is homozygous for dimples and has blue eyes. Ashley is heterozygous for both dimples and brown eyes. What are their genotypes?
a) Mike - DdBb, Ashley - DDbb
b) Mike - DDbb, Ashley - DbBb
c) Mike - DDBb, Ashley - ddBb
d) Mike - ddbb, Ashley - DDBB

Purple flowers (P) are dominant to white flowers. Tall stems (T) are dominant to short stems. Parent 1 - has white flowers and heterozygous for tall stems. Parent 2 -heterozygous for purple flowers and has short stems.Which is true about their kids?
a) White flowers and short stems = 1/16
b) Purple flowers and short stems = 75%
c) White flowers and tall stems = 2/4
d) Purple flowers and tall stems = 4/16

Round seeds (R) are dominant to wrinkled seeds. What are the parents' genotypes if they have offspring that are 50% heterozygous and 50% homozygous dominant?
a) Parent 1 - Rr. Parent 2 - rr
b) Parent 1 - RR. Parent 2 - Rr
c) Parent 1 - Rr. Parent 2 - Rr
d) Parent 1 - rr. Parent 2 - RR

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