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Author Question: During a prenatal visit, a patient asks what determines the sex of the baby. The correct explanation ... (Read 67 times)

rosent76

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on: Jun 28, 2018
During a prenatal visit, a patient asks what determines the sex of the baby. The correct explanation is that:
 
  a. The mother determines the sex by the number of Y chromosomes she contributes.
  b. Females have X chromosomes only, and males have Y chromosomes only, so there are equal chances of each child being male or female.
  c. Two X chromosomes produce a female child, whereas two Y chromosomes produce a male child.
  d. If the father contributes an X chromosome, the baby will be a girl; if he contributes a Y chromosome, the baby will be a boy.

Question 2

The nucleus of each somatic (body) cell contains _____ chromosomes.
 
  a. 23
  b. 28
  c. 46
  d. 48


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choc0chan

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Reply #1 on: Jun 28, 2018
Answer to Question 1

ANS: D
The ovum has two X chromosomes; the sperm has one X and one Y chromosome. If the sperm contributes the X chromosome, the zygote will have two X chromosomes and will be female. If the sperm contributes the Y chromosome, the zygote will have one X and one Y chromosome and will be male.

Answer to Question 2

ANS: C
Each somatic cell contains 22 pairs of autosomes and two sex chromosomes for a total of 46.


rosent76

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Reply 2 on: Jun 28, 2018
Excellent

ashely1112

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Reply 3 on: Yesterday
Wow, this really help

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