The region of the chromosome to which the spindle attaches is known as the A chr

Question

The region of the chromosome to which the spindle attaches is known as the A chromatid B telomere C acromere D centromere E curmudgeon 2) A test cross is used to determine if the genotype of a plant with the dominant phenotype is homozygous or heterozygous. If the unknown is homozygous, all of the offspring of the test cross have the _______ phenotype. If the unknown half of the offspring will have the _______ phenotype. A dominant, incompletely dominant B recessive, dominant D dominant, epistatic D codominant, complimentary E dominant, recessive 3) Some of these events occur in both mitotic and meiotic cells while some of events occur only in meiosis. Identify the event that does not occur in mitosis A Sister Chromatid formation B Spindle formation C DNA replication D Chromosome movement E Synapsis 4) Hemophilia in humans is due to an X-chromosome gene mutation. results of mating between a homozygous normal female and a hemophilac A 1/2 daughters are normal and 1/2 sons are hemophiliacs B All sons are normal, all daughters are carriers C 1/2 sons are normal and 1/2 sons are hemophiliac, all daughters are D All daughters are normal, all sons are carriers E 1/2 daughters are hemophiliac, 1/2 daughters are carriers, all sons are 5) A and B are dominant over O and A and B are codominant to one A man is A and his wife is O blood type. Possible blood groups of their A A or B B O or B C O only D A or O E A only

Explanation / Answer

Answer:

1). D. Centromere

Centromere is the region of a chromosome to which the microtubules of the spindle attach, via the kinetochore, during cell division.

2). E. Dominant, recessive

----AA (unknown homozygous) x aa ---Test cross

                               Aa (all are dominant)

-----Aa (unknown heterozygous) x aa ---Test cross

                 Aa (dominant, 50%) & aa (recessive, 50%)

3). E. Synapsis

Synapsis is the pairing of homologous chromosomes during zygotene phase of prophase I. It does not occur in mitosis.

4). B. All sons are normal, all daughters are carriers

XX (homozygous normal female) x (hemophilac male) XhY----Parents

Xh

Y

X

XXh (Carrier daughters)

XY (normal sons)

5). D). A or O

A (IAi) x O (ii)---Parents

i

IA

IAi (A)

i

ii (O)

If the A blood is homozygous all the progeny would be blood group, A

If the A blood is heterozygous 50% the progeny would

Xh

Y

X

XXh (Carrier daughters)

XY (normal sons)

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