Sex Determination

Q.

What is the opposite gender of drake?

Q.

In our society the women are often blamed for giving birth to daughters.

Can you explain why this is not correct?

Q. How is the sex-determination mechanism different in the birds? Is the sperm or the egg responsible for the sex of the chicks?

Q.

In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?

Q. In the case of incomplete dominance, what is the phenotypic ratio of monohybrid cross in $F_2$ generation?

1. 3:1
2. 1:2:1
3. 2:3:1
4. 9:3:3:1

Q. A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason. [1]

Q. Given pedigree shows the inheritance of an autosomal recessive gene (A/a). What is the genotype of 1 and 2 parents?

1. AA, aa
2. aa, AA
3. Aa, aa
4. Aa, Aa

Q. What proportion of the offspring obtained from cross AABBCC × AaBbCc will be completely heterozygous for all genes segregated independently?

1. 1/16
2. 1/8
3. 1/4
4. 1/2

Q.

What is an example of haploid-diploid insects?

Q. Which cell division process is associated with asexual reproduction?

1. Equational division
2. Reductional division
3. Meiotic division
4. Haplosis

Q.

What type of sex determination is present in insects.

Q.

Freshly released human egg has

1. One Y - chromosome

2. One X - chromosome

3. Two X - chromosome

4. One X- chromosome and one Y- chromosome

Q.

What is the opposite gender of duchess?

Q.

The genotypic ratio of monohybrid cross, 1/4 TT + 1/2Tt + 1/4 tt is mathematically condensable to the form of binomial expression:

1. $(1/2T+1/2t{)}^2$

2. $(1/4T+1/4t{)}^2$

3. $(1/4T+1/2t{)}^2$

4. $(1/2T+1/4t{)}^2$

Q.

Each sperm cell contains 23 chromosomes : 22 autosomes and one sex chromosome (X or Y).

1. False
2. True

Q.

Structures present in a cell which is responsible for determination of the sex of a baby is

1. cytoplasm

2. cell membrane

3. nucleus

4. chromosome

Q.

Name the chromosome that is present in both male as well as female.

Q. Pairing of homologous chromosomes takes place in:

1. Zygotene
2. Leptotene
3. Diplotene
4. Pachytene

Q. Which of the following is incorrect regarding the ZW-ZZ type of sex determination?

1. It occurs in birds and some reptiles.
2. Females are homogametic and males are heterogametic
3. 1:1 sex ratio is produced in offsprings
4. All of these

Q.

How is the sex determination mechanism different in the birds?

Q.

Freshly released human egg has

1. One Y - chromosome

2. One X - chromosome

3. Two X - chromosomes

4. One X - chromosome and one Y - chromosome

Q.

Who Discovered Chromatin?

Q. In the given human pedigree, the filled symbols represent an affected individual. Identify the type of given pedigree.

1. X-linked dominant
2. Autosomal dominant
3. X-linked recessive
4. Autosomal recessive

Q. Which of the given statements are true w.r.t. sex determination in honey bee?

दिया गया कौनसा कथन मधुमक्खी में लिंग निर्धारण के संदर्भ में सही हैं?

A. It is based on number of sets of chromosomes an individual receives.

A. यह मधुप द्वारा प्राप्त गुणसूत्रों समुच्चय की संख्या पर निर्भर करता है

B. Both of the sexes are diploid.

B. दोनों लिंग द्विगुणित होते हैं

C. Drones do not have father and thus cannot have sons, but have grandfather and can have grandsons.

C. ड्रोन के पिता नहीं होते हैं इसलिए इनके पुत्र नहीं हो सकते, परंतु इनके दादा होते हैं तथा इनके पोते हो सकते हैं

D. The mode of sex determination is called haplodiploid sex-determination system.

D. लिंग निर्धारण की विधि अगुणित द्विगुणितकी लिंग-निर्धारण प्रणाली कहलाती हैं

1. A and B
   
   A तथा B
2. B and C<br><br>
   
   B तथा C
3. A, C and D
   
   A, C तथा D
4. All A, B, C and D
   
   सभी A, B, C तथा D

Q. Match the organisms with the types of sex determination.

1. Cow
2. Hen
3. Butterfly
4. Bee

Q. A certain couple got only four daughters in a row and no son. What is the reason for this condition?

1. The male patner does not produce Y-bearing sperm
2. The male patner does not bear enough sperms in his semen
3. The female partner has an extra X in her ova
4. None of the above

Q. Sex determination in animals such as humans and insects is done using the XX-XO and XX-XY mechanisms. In some organisms ZZ-ZW mechanism of sex determination is seen.
Based on the given statement, answer the question given below.

Which of the following is incorrect regarding the ZW-ZZ type of sex determination?
[1 mark]

1. It occurs in birds and some reptiles
2. Females are homogametic and males are heterogametic
3. 1:1 sex ratio is produced in offsprings
4. All of these

Q. Drosophila is used in the study of genetics because

1. generation period is 90 – 120 days
2. chromosome complement is simple with three pairs of autosomes and X, Y sex chromosomes.
3. all of the above
4. it is hermaphrodite

Q.

What does XY chromosome mean?

Q. Which of the following is not a true statement?

1. Genes are the units of inheritance
2. A genetic cross between TT & tt is a monohybrid cross
3. Inflated or full pod shape is a dominant trait in a pea plant
4. Law of segregation explains the 3 : 1 ratio obtained in the $F_2$ generation of a monohybrid cross