Science 30 Assignment 1.2.2 Inheritance (13 Marks)
For questions 1 to 2, read each question carefully. Decide which of the choices BEST answers the question. Place your answer in the blank space given.(1 mark) / 1. / Which of the following is an acquired trait rather than an inherited trait?
A.eye colour
B.blood type
C.colour blindness
D.fluency in Spanish
Answer:
(1 mark) / 2. / Consider the O, A, B, and AB blood types for humans. How many alleles are there for the gene controlling these blood types?A.1
B.2
C.3
D.4
Answer:
(3 marks) / 3. / Two pea plants in the parent generation each contain the dominant allele G that codes for green pea pods and the recessive allele g that codes for yellow pods.Use a Punnett square to predict the probability that a plant from the first generation will have yellow pea pods.
Answer:
(1 mark) / 4. / Use the following information to answer the question.A market gardener crossed a tomato plant that had yellow fruit with one that had
red fruit. This crossing resulted in 302 seeds. When these seeds matured into plants,
147 had yellow fruit and 155 had red fruit.
Which of the following Punnett squares represents the cross?
A. B.
C. D.
Answer:
5. / The right-handed allele, R, is dominant over the left-handed allele, r. The Punnett square representing a cross between a homozygous left-handed male, rr, and a homozygous right-handed female, RR, is as follows.(1 mark) / a.Describe the left/right-handed genotypeof the offspring.
Answer:
(1 mark) / b.Describe the left/right-handed phenotypeof the offspring.Answer:
(2 marks) / 6. / Suppose a certain individual CANNOT roll his or her tongue. Explain why you can conclude that this individual has two recessive alleles for this trait.Answer:
7. / In cats, the gene that causes ginger fur is carried on the X chromosome. The allele for ginger colour, G, is dominant to the one for black colour, g.(3 marks) / a.Draw a sex-linked Punnett square for a ginger male cat crossed with a black female cat.
Answer:
(1 mark) / b.Determine the probability of the male offspring having black fur.Answer:
(1 mark) / c.Determine the probability of the female offspring having black fur.Answer:
(1 mark) / d.Determine the probability of the female offspring being carriers of the recessive gene for black fur.Answer: