In cows, heterozygotes are roan in colour, while homozygotes are either red or white. When crossing a roan and white cow, what proportion of the offspring will be roan in colour?单项选择题

题目图片
A

a. 0%

B

b. 50%

C

c. 25%

D

d. 75%

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In the analysis of a family, you notice that males are more likely to contract a certain disease and the daughters of affected males produce 50% of their sons affected with the disease. This disease is displaying what pattern of inheritance?

Question textIn the pedigree shown below, several individuals are heterozygous for a deletion on chromosome 12 (12 _DEL_q5) as shown in the table; wild type chromosome 12 is called 12q5. Individuals III-2 and III-4 are affected by the same disease (see Table); no other family members are affected. Fill in the gaps in the following sentence with a single word in each space.The most likely genetic cause of this disease is inheritance of 12_DEL_q5 from the Answer 1 Question 3[input] parent plus Answer 2 Question 3[input] of part of the wild type copy of chromosome 12 from the Answer 3 Question 3[input] parent. (1 + 1 +1 = 3 marks)If they were to have progeny of their own (with unrelated partners), which member of Generation III would be likely to have children affected by the same disease as III-2 and III-4? Answer 4 Question 3[select: , III-1, III-2, III-3, III-4, III-5, III-6, III-7, III-8] (1 mark)[table] Family Member | Disease Status | Genotype I-1 | Healthy | 12_DEL_q5 / 12q5 I-2 | Healthy | 12q5 / 12q5 II-1 | Healthy | 12q5 / 12q5 II-2 | Healthy | 12_DEL_q5 / 12q5 II-3 | Healthy | 12_DEL_q5 / 12q5 II-4 | Healthy | 12q5 / 12q5 III-1 | Healthy | 12q5 / 12q5 III-2 | affected | 12_DEL_q5 / 12q5 III-3 | Healthy | 12q5 / 12q5 III-4 | affected | 12_DEL_q5 / 12q5 III-5 | Healthy | 12q5 / 12q5 III-6 | Healthy | 12_DEL_q5 / 12q5 III-7 | Healthy | 12q5 / 12q5 III-8 | Healthy | 12_DEL_q5 / 12q5 [/table]

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