Which of the following determines the sex of a child?
1)The length of the mother’s pregnancy
2)The length of time between ovulation and copulation
3)The presence of an X chromosome in an ovum
4)The presence of a Y chromosome in a sperm
Answers
The Correct Answer is
4. the presence of a Y chromosome in a sperm
Answer:
1 ) The average length of human gestation is 280 days, or 40 weeks, from the first day of the woman's last menstrual period.
2) If your cycle is 28 days, ovulation should occur on day 14. Therefore aim to have regular intercourse from 10 days after your period has started. If your period is 35 days, then ovulation should occur at 21 days and intercourse should be from 17 days after your period started.
3) Females have two X chromosomes in their cells, while males have X and Y chromosomes in their cells. Egg cells all contain an X chromosome, while sperm cells contain an X or a Y chromosome. This arrangement means that during fertilization, it is the male that determines the sex of the offspring.
4) The other is the X chromosome. Y is normally the sex-determining chromosome in many species, since it is the presence or absence of Y that typically determines the male or female sex of offspring produced in sexual reproduction. In mammals, the Y chromosome contains the gene SRY, which triggers male development.
your answer is 4 )