题目
题目

Bio 93 Section CDE 2025 Final Exam Practice Part 2

多重下拉选择题

A man who is a dwarf with achondroplasia and normal vision marries a color-blind woman of normal height. The man's father was average height, and both the woman's parents were of average height. A) Dwarfism caused by achondroplasia is autosomal dominant, which means [ Select ] . B) Red-green color blindness is X-linked recessive, which means that in female offspring, [ Select ] . C) What proportion of their sons would be color blind and of normal height? [ Select ] . D) What proportion of their daughters would be color blind and of normal height? [ Select ] .

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标准答案
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思路分析
We start by restating the setup and what each dropdown option is aiming to describe, then examine each statement in turn. A) The first dropdown says: the gene is carried on a non-sex chromosome. - This relates to achondroplasia, which is caused by a single gene on an autosome and is inherited in an autosomal dominant manner. Since the man is a dwarf due to achondroplasia and the partner is of normal height, recognizing that the gene is on a non-sex chromosome explains why height can segregate in standard autosomal fashion (not linked to sex chromosomes). The key point is that autosomal genes are on non-sex chromosomes, so inheritance patterns involve both sexes with the usual Mendelian expectations. - Why this makes sense in context: an autosomal dominant condition can produce affected offspring even if only one parent carries the mutant allele, and it is not tied to sex chromosome inheritance. This aligns with the phenotype described (dwarfism) being transmitted in a typical autosomal pattern rather than X-linked or Y-linked. B) The second dropdown says......Login to view full explanation

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