Gametogenesis and Germ Cells Quiz

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Questions and Answers

What is the term for the conversion of germ cells into male and female gametes?

  • Gametogenesis (correct)
  • Meiosis
  • Cytodifferentiation
  • Fertilization

How many genes do humans have on 46 chromosomes?

  • 10,000
  • 5,000
  • 100,000
  • Approximately 23,000 (correct)

What is the name for the pairs of matching chromosomes in somatic cells?

  • Autosomal pairs
  • Homologous pairs (correct)
  • Heterozygous pairs
  • Sex-linked pairs

What is the result of the sex pair being XY?

<p>The individual is genetically male (A)</p> Signup and view all the answers

What is the process by which germ cells undergo to reduce the number of chromosomes and complete their maturation?

<p>Meiosis (C)</p> Signup and view all the answers

What is the chromosome composition of each gamete?

<p>Haploid number of 23 chromosomes (C)</p> Signup and view all the answers

What is the process whereby one cell divides, giving rise to genetically identical daughter cells?

<p>Mitosis (B)</p> Signup and view all the answers

Which cell division takes place in the germ cells to generate male and female gametes?

<p>Meiosis (B)</p> Signup and view all the answers

What is the specific term for the process whereby oogonia differentiate into mature oocyte?

<p>Oogenesis (B)</p> Signup and view all the answers

Which period involves oogonia increasing in the ovary through mitotic division?

<p>Period of multiplication (D)</p> Signup and view all the answers

At what stage do primary oocytes enter meiosis I to produce secondary oocytes and first polar body?

<p>Period of maturation (D)</p> Signup and view all the answers

When does the total number of germ cells in the ovary reach its maximum during prenatal development?

<p>Fifth month (D)</p> Signup and view all the answers

What happens by the seventh month of prenatal development regarding the majority of oogonia in the ovary?

<p>They degenerate and become atretic (C)</p> Signup and view all the answers

"Chiasma" is formed during which stage of meiotic division involving homologous chromosomes?

<p>[Crossover] to form chiasma (D)</p> Signup and view all the answers

What happens during anaphase of the first meiotic division?

<p>Double structured chromosomes pull apart (D)</p> Signup and view all the answers

What is the term used for an organ that produces gametes such as testis or ovary?

<p>Gonad (B)</p> Signup and view all the answers

During which month of the fetal period does the size of the head become approximately 1/4th of the crown – heel length?

<p>5th month (B)</p> Signup and view all the answers

At what point during the fetal period does the transformation of embryo to fetus occur?

<p>End of 9th week (A)</p> Signup and view all the answers

What marks the beginning of the fetal form of external genitalia during the fetal period?

<p>12th week (C)</p> Signup and view all the answers

When do the legs become short and thighs small during the fetal period?

<p>Beginning of 9th week (A)</p> Signup and view all the answers

At what stage does the growth of the head constitute approximately 1/2 of crown – rump length (CRL) during the fetal period?

<p>Beginning of 3rd month (A)</p> Signup and view all the answers

During which week does the spleen become an important site of hematopoiesis?

<p>28th week (A)</p> Signup and view all the answers

At what stage do the intestinal loops withdraw into the abdominal cavity?

<p>12th week (B)</p> Signup and view all the answers

When do rapid eye movements begin in the fetus?

<p>21st week (C)</p> Signup and view all the answers

At what stage does the fetus respond to noise with blink-startle responses?

<p>24th to 25th weeks (B)</p> Signup and view all the answers

When is the site of hematopoiesis transferred from the liver to the spleen?

<p>9th to 12th week (B)</p> Signup and view all the answers

What happens during the 26th week of fetal development?

<p>Hematopoiesis shifts to bone marrow (D)</p> Signup and view all the answers

At what stage do the intestines cease to be in the umbilical cord?

<p>11th week (D)</p> Signup and view all the answers

When does the fetus reach a length of about 25cm and weigh approximately 1100gms?

<p>6.5 to 7 months (D)</p> Signup and view all the answers

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