THE PROCESS OF SCIENCE 12. A mule is the offspring of a horse and a donkey. A do
ID: 136151 • Letter: T
Question
THE PROCESS OF SCIENCE 12. A mule is the offspring of a horse and a donkey. A donkey sperm con- tains 31 chromosomes and a horse egg has 32 chromosomes, so the zygote contains a total of 63 chromosomes. The zygote develops nor- mally. The combined set of chromosomes is not a problem in mitosis, and the mule combines some of the best characteristics of horses and donkeys. However, a mule is sterile; meiosis cannot occur normally in its testes or ovaries. Explain why mitosis is normal in cells containing both horse and donkey chromosomes but the mixed set of chromo- somes interferes with meiosis. 13. You prepare a slide with a thin slice of an onion root tip. You see the fol- lowing view in a light microscope. Identify the stage of mitosis for each of the outlined cells, a-d. 14. Interpreting Data The graph in the right hand column shows the ind- dence of Down syndrome in the offspring of normal parents as the ageExplanation / Answer
Answer 12-In meiosis first step all chromosomes have to make their copies and a mule cell can do it well so it has 63 doubled chromosomes but the main problem arises in next step. All chromosomes need to be match in a specific way but the chromosomes are not much similar for easy matching so we can say pairing is not perfect therefore sperm count is very low.
Answer 13-
A)Metaphase
B) Later prophase
C)telophase
D) Anaphase
Answer 14- under age 30,less than 1 infants are born with Down syndrome..Frequency increases with the age of mother. At age 42 frequency somewhat increases by one in 60 and atage 50 chance is one in 12.Because older mother have fewer babies than the younger ones
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