6. Choose from the following to answer the following: A) Aneuploidy . B) Autoplo

Question

6. Choose from the following to answer the following: A) Aneuploidy. B) Autoploidy, C) An inversion heterozygote, D) A heterozygote for a translocation (chromosomal interchange), E) Allopolyploidy .

a) Which of the above is most llkely to produce a range of physical and behavioral phenotypic effects? Give an example.

b) Which of the above is expected to result in up to 50% infertility?

c) Which of the above explains why commercial bananas have no fully developed seeds?

d) Which of the above produces an abnormal configuration (a cross or a loop) at the late pachytene stage of meiosis?

e) Which of the above might show pairing of Homeologuesat metaphase I of Meiosis?

f) Which of the above would show pairing of homologues at metaphase I of meiosis?

g) Which of the above would show pairing of homologues at metaphase of mitosis?

Explanation / Answer

6. a) C) Inversion heterozygote

Example: Cri-du-chat (cat's cry) syndrome- Infants have high-pitched cry like cat and suffer from intellectual disability. Infants with the syndrome also have delayed development, low birth weight, small head size, and hypotonia.

b) B) Autoploidy

Due to polysomic inheritance the fertility levels are declined.

c) B) Autoploidy

Commercial bananas do not have seeds due to autoploidy.

d) C) Inversion heterozygote

It pairs in a loop at the pachytene stage.

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