Chickadees were given an opportunity to store seeds in 72 possible storage sites consisting of holes drilled in small trees that had been placed in an aviary. Typically, the seeds were placed in only 4 or 5 storage sites. The chickadees were then removed from the aviary, the seeds removed from the storage sites, and each hole covered. A day later, the chickadees were returned to the aviary and they spent nearly 5 times as long pulling at the covers on storage sites than at the covers on sites where they had not stored food. This experiment indicates that chickadees

#Question id: 5718

#Unit 8. Inheritance Biology

aneuploids may arise through nondisjunction, the failure of homologous chromosomes or sister chromatids to separate in meiosis. which of following the incorrect about nondisjuction ?

#Question id: 5717

#Unit 8. Inheritance Biology

Following homologous chromosome is a heterozygous for inversion

Following some statement regarding above abnormality is correct?

A. During meiosis, one chromosome twists once at the ends of the inversion to pair with the other untwisted chromosome

B. Crossing-over within the inversion loop at meiosis connects homologous centromeres in a dicentric bridge.

C. Tension eventually breaks the dicentric bridge, forming two chromosomes with terminal deletions.

D. the RF is zero among genes within the inversion region

#Question id: 5716

#Unit 8. Inheritance Biology

Which of the meiotic pairing possibilities in tetraploids and their consequence is correct?

A-chromosomes pair as bivalents, segregate normally producing diploid gametes.

B- Chromosomes pair as quadrivalent, segregates normally producing tetraploid gametes.

C-Chromosome pair as Trivalents form, segregation leads to nonfunctional aneuploid gametes

 D- Chromosome pair as Trivalents form, segregation leads to producing diploid gametes

#Question id: 5715

#Unit 8. Inheritance Biology

Following some abnormality is due to Gene rearrangement on chromosome. 

A, Affecting the expression of gene

B. Disrupt the function of gene

C. Reduced recombination between gene present in inverted region

D. Cross over suppressor 

Which of the following above abnormality is may be associated with inversion?

#Question id: 5714

#Unit 8. Inheritance Biology

Homologous chromosomes pair in prophase I as a following way, if crossing over occur between P and Q gene of homologous chromosome?

Which of the following consequence of above abnormality?

A. Dicentric chromosome visible at anaphase I

B. Results in formation of acentric chromatid

C. Recombinant gamete unable to produced viable progeny due to missing of many gene

D. Resulting recombinant gamete become aneuploid 

#Question id: 5713

#Unit 8. Inheritance Biology

Following some statement are correct?

A) Translocation may be associated with movement of genetic material within the same chromosome

B) A person that is heterozygous for translocation may result in non viability in their zygote

C)  A person that is heterozygous for inversion may result in non viability in their recombinant zygote

D) A person that is heterozygous for translocation and lack of crossing over within translocated area result in all viable gametes