Chapter 14 Digging Deeper Conceptual Learning Activity Attempts 2 3 X Linked Traits Average 2 3 X Linked Traits Are Ca 1 (72.32 KiB) Viewed 22 times
Chapter 14 Digging Deeper Conceptual Learning Activity Attempts 2 3 X Linked Traits Average 2 3 X Linked Traits Are Ca 2 (68.35 KiB) Viewed 22 times
Chapter 14 Digging Deeper: Conceptual Learning Activity Attempts 2 3. X-linked traits Average 2/3 X-linked traits are caused by genes found on the X chromosome in humans. Sex chromosomes are passed on to offspring through the law of segregation, the same as all the autosomal chromosomes. There are many different conventions for representing the alleles of X-linked traits in a Punnett square. This problem uses the following convention: The sex chromosomes are indicated with a capital X or Y. The alleles found on those chromosomes are indicated with a superscript letter next to the sex chromosome letter. For example, an X chromosome carrying a dominant allele for a trait would be represented as X, and an X chromosome carrying a recessive allele for that trait would be represented as X. This problem discusses genes that are found only on the X chromosome, so no allele is listed for the Y chromosome. Duchenne muscular dystrophy (DMD) is a serious disorder that causes progressive degeneration of the muscles, DMD is caused by a recessive X- linked allele, meaning that the defective allele that causes DMD is found only on the X chromosome. People affected with DMD usually do not have children, either by choice or because the condition prevents them from doing so. For the purposes of this question, however, assume that they are able to have children Imagine that two people are planning to have a child together. The woman is a normal female with no recessive DMD allele, and the man is normal male. Complete the Punnett square, showing the possible genotypes and phenotypes their children could have. (Note: The man's genotype has already been filled in for you. Keep in mind that in Punnett squares the dominant allele is always listed first.) XD Say this couple ends up having a son. What is the chance that this child has DMD?: 100% O 75% 0.0%
Chapter 14 Digging Deeper: Conceptual Learning Activity linked allele, meaning that the defective allele that causes DMD is found only on the X chromosome. People affected with DMD usually do no have children, either by choice or because the condition prevents them from doing so. For the purposes of this question, however, assume they are able to have children. Imagine that two people are planning to have a child together. The woman is a normal female with no recessive DMD allele, and the man is normal male. Complete the Punnett square, showing the possible genotypes and phenotypes their children could have. (Note: The man's genotype has already been filled in for you. Keep in mind that in Punnett squares the dominant allele is always listed first.) XD Say this couple ends up having a son. What is the chance that this child has DMD? O 100% O 75% 00% 50% Cri Assuming that the mother does not have DMD herself, what would the parents have to be in order for them to have a daughter who has DMD? O The mother would have to be a normal female, and the father would have to not have DMD. O The mother would have to be a camer, and the father would have to not have DMD. O The mother would have to be a carrer, and the father would have to have DMD. Grade It Now Save & Continue Continue without saving
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