During meiosis I in an individual carrying a reciprocal translocation, the homologous chromosomes synapse with each other via the formation of a structure that contains four pairs of sister chromatids. This unusual structure is called a translocation
Added by Steven A.
Close
Step 1
Step 1: The structure formed during meiosis I in Show more…
Show all steps
Your feedback will help us improve your experience
Khalida Dawar and 57 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Chromosomes normally associate during meiosis I as bivalents (a pair of synapsed homologous chromosomes because chromosome pairing involves the synapsis of the corresponding regions of two homologous chromosomes. However, Fig. 13.17 b shows that in a heterozygote for a reciprocal translocation, chromosomes pair as quadrivalents (that is, four chromosomes are associated with each other). Quadrivalents can form in other ways: For example, in some autotetraploid species, chromosomes can pair as quadrivalents rather than as bivalents. a. How could quadrivalents actually form in these autotetraploids, given that chromosomal regions synapse in pairs? To answer this question, diagram such a quadrivalent. b. How can these autotetraploid species generate euploid gametes if the chromosomes pair as quadrivalents rather than bivalents? c. Could quadrivalents form in an amphidiploid species? Discuss.
An individual heterozygous for a reciprocal translocation possesses the following chromosomes: (FIGURE CANNOT COPY) a. Draw the pairing arrangement of these chromosomes in prophase I of meiosis. b. Diagram the alternate, adjacent-1, and adjacent-2 segregation patterns in anaphase I of meiosis. c. Give the products that result from alternate, adjacent-1, and adjacent-2 segregation.
Josee P.
An individual heterozygous for a reciprocal translocation possesses the following chromosomes: A B • C D E F G A B • C D V W X R S • T U E F G R S • T U V W X Q. Draw the pairing arrangement of these chromosomes in prophase I of meiosis.
Adi S.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD