Principles of Inheritance & Variation Test 5

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Principles of Inheritance & Variation Test 5

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Weekly Quiz Competition

Question 1
1 / -0

Complete linkage is observed in

A
Male Drosophila sp.

B
Female Drosophila sp.

C
Female silkworm

D
None of these

Solution

Complete linkage is defined as the state in which two loci are so close together that alleles of these loci are virtually never separated by crossing over. In the case of male Drosophila there is a complete absence of recombinant types due to the absence of crossing over. This means that all of the genes that start out on a single chromosome, will end up on that same chromosome in their original configuration.
So, the correct answer is 'Male Drosophila'.
Question 2
1 / -0

Which one of the following conditions of a zygotic cell would lead to the birth of a normal human female child?

A
Only one X chromosome

B
One X and one Y chromosome

C
Two X chromosomes

D
Only one Y chromosome

Solution

The sex determining mechanism in case of humans is XY type. Sperms are of two types, one containing X -chromosome and another containing Y- chromosome.
Question 3
1 / -0

ZZ/ZW type of sex determination is seen in

A
platypus

B
snails

C
cockroach

D
peacock

Solution

XX-XO type or Protenor type : Mc clung in male squash bug (Anasa) observed 10 pairs of chromosomes and an unpaired chromosome. Their females have eleven pairs of chromosomes (22). Thus all the eggs carry a set of eleven chromosomes but the sperm are of the two types: fifty percent with eleven chromosomes and the other fifty percent with ten chromosomes. The accessory chromosome was X-chromosomes. Fertilization of an egg by a sperm carrying eleven chromosomes results in a female, while its fertilization by a sperm with ten chromosomes produces male. It is said to be evolved by the loss of Y-chromosome. e.g., Grasshopper and plant kingdom in Dioscorea sinuta and Vallisneria spiralis.
Question 4
1 / -0

Crossing over is the exchange of genetic material between

A
Non-sister chromatids of homologous chromosomes

B
Sister chromatids of homologous chromosomes

C
Genes which are completely linked

D
Chromatids of non-homologous chromosomes

Solution

Each chromosome has 2 chromatids called sister chromatids. Human has 2 pairs of each chromosome called homologues chromosomes where one comes from mother and other from father. Crossing takes place during pachytene stage between non sister ( one chromatids from each homologues chromosomes) chromatids of homologues chromosomes.
Question 5
1 / -0

Crossing over in diploid organisms results in

A
Segregation of alleles

B
Recombination of linked genes

C
Dominance of genes

D
Independent assortment

Solution

Chromosomal crossover (or crossing over) is an exchange of genetic material between homologous chromosomes. It is one of the final phases of genetic recombination, which occurs during prophase I of meiosis (pachytene) in a process called synapsis. Synapsis begins before the synaptonemal complex develops, and is not completed until near the end of prophase I. Crossover usually occurs when matching regions on matching chromosomes break and then reconnect to the other chromosome.