Explore topic-wise MCQs in Cytogenetics.

This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Cytogenetics knowledge and support exam preparation. Choose a topic below to get started.

1.

Dominant lethal alleles are quickly removed from the pool while the recessive ones remain.

A. True
B. False
Answer» B. False
Discussion
2.

Huntington’s disease affects individuals carrying the gene starting from the age of ____________

A. 10
B. 20
C. 30
D. Random
Answer» D. Random
Discussion
3.

A person homozygous for lethal allele______________

A. Always dies
B. Always expresses the phenotype
C. May not express the phenotype
D. They have severe abnormalities
Answer» D. They have severe abnormalities
Discussion
4.

Tay Sach’s disease doesn’t agree with which of the following?

A. It causes death in heterozygotes
B. Death occurs within 2-3 years of life
C. HEXA gene is affected
D. Central nervous system is affected
Answer» B. Death occurs within 2-3 years of life
Discussion
5.

HUNTINGTON‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬•S_DISEASE_AFFECTS_INDIVIDUALS_CARRYING_THE_GENE_STARTING_FROM_THE_AGE_OF_____________?$#

A. 10
B. 20
C. 30
D. Random
Answer» D. Random
Discussion
6.

Dominant_lethal_alleles_are_quickly_removed_from_the_pool_while_the_recessive_ones_remain.$

A. True
B. False
Answer» B. False
Discussion
7.

A person homozygous for lethal allele_____________?

A. Always dies
B. Always expresses the phenotype
C. May not express the phenotype
D. They have severe abnormalities
Answer» D. They have severe abnormalities
Discussion
8.

Tay Sach’s disease doesn’t agree with which of the following?$

A. It causes death in heterozygotes
B. Death occurs within 2-3 years of life
C. HEXA gene is affected
D. Central nervous system is affected
Answer» B. Death occurs within 2-3 years of life
Discussion
9.

The lethal mutation that is seen in the yellow mice is due to _______________ mutation

A. Insertion
B. Deletion
C. Non-sense
D. Frame shift
Answer» C. Non-sense
Discussion
10.

Which of the following is not true for yellow mice?

A. The homozygous yellow mice die
B. A normal ice crossed to yellow mice will always give normal probabilities of F1
C. In yellow mice the yellow coloring allele is under control of Raly promoter
D. The homozygous mouse dies as the yellow allele is produced in excess
Answer» E.
Discussion
11.

Cross of two yellow mice will give _____________ normal mouse.

A. 1/4
B. 2/4
C. 1/3
D. 2/3
Answer» D. 2/3
Discussion
12.

The ______________ mouse is lethal.

A. Homozygous white
B. Homozygous black
C. Heterozygous agouti
D. Homozygous yellow
Answer» E.
Discussion
13.

In Aurea, a type of snapdragon, only ______________ carrying dominant genes live.

A. Homozygous
B. Homozygote
C. Heterozygote
D. Heterozygous
Answer» D. Heterozygous
Discussion
14.

Lethal alleles can only be recessive.

A. True
B. False
Answer» C.
Discussion