A continuously varying trait is encoded by alleles of two or more different genes located at different loci, all influencing the same trait in an additive way is known as ________.

NUMS 2019 Cancelled
Biology
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When both the alleles of a gene pair are same, the organism is said to be:

PMC 2020
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Red green colour blindness is a sex linked recessive trait. If a colour blind man marries a woman with normal vision whose father is colourblind and they have a daughter, what is the probability that she will be colourblind?

NTS 2015 SMBBMC
Biology
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Which of the following does not belong to the same linkage group?

NUMS 2015
Biology
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Which statement about dominant and recessive alleles is not correct?

NTS 2016 SMBBMC
Biology
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Filial is a Latin word. It means

If we cross round yellow seeded plant with green wrinkled seeded plants, what will be phenotypic ratio at F2 generation?

NUMS 2019 Cancelled
Biology
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The disease, which is caused by defect in a single gene or pair of genes is referred to as:

NTS 2016 SMBBMC
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Two animals are mated. One is homozygous dominant for one character and homozygous recessive for another. The other animal Is heterozygous for both characters. How many phenotypes are expected in the offspring of this cross?

NTS 2016 DUHS & JSMU
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A monohybrid cross yielded 3:1 in F2. What could be mode of inheritance?

The type of gene interaction in which the effect caused by a gene at one locus interfere with the effect caused by another gene at another locus is known as:

NUMS 2018
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Genotype of blood group ‘AB’ in human is ______.

NUMS 2015
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When phenotype of a heterozygote is in between the phenotypes of both the homozygous parents, it is called:

NUMS 2016
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Haemophilia occurs because of:

PMC 2020
Biology
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Linked genes with closer loci ______ Mendel’s law of independent assortment as they _____ assort independently.

NUMS 2019 Reconduct
Biology
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Pick the correct option about Drosophila.

NUMS 2015
Biology
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The law of dominance is illustrated in the garden pea by:

NTS 2010
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Which of the following condition is hybrid A. TT B. Tt C. tt D. All of these

If a heterozygous individual shows the complete effect of both alleles, the type of inheritance would be

To check the homozygosity or heterozygosity of apparently dominant trait, we do the test cross by crossing it with:

NUMS 2019 Cancelled
Biology
Variation and Genetics
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Erythroblastosis foetalis occurs when:

NTS 2011
Biology
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D) Both mother and baby are Rh-positive

A pea plant with yellow seed was crossed to a plant having green seeds. What will happen in F1; if plants are true breeding

Read the passage below to answer the question:

Haemophilia is a disorder in which blood fails to clot. Saad, a male haemophiliac, marries Sara, a normal woman and together they have four children, two boys (Ahmed and Ali) and two girls (Alia and Ayesha). None of the children display the symptoms of Haemophilia.

Ahmed, Ali, Ayesha, and Ali all marry normal individuals and have children. None of Ahmed’s or Ali’s children, male or female, display symptoms of haemophilia, but the sons of Alia and Ayesha display symptoms of haemophilia while the daughters of Alia and Ayesha do not.

Which of the following best explains the reason that Ahmed, Ali, Ayesha and Alia do not display symptoms of haemophilia, even though their father, Saad, is a haemophiliac.

NTS 2010
Biology
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______ are more common in human males than females.

NUMS 2016
Biology
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An X to A ratio of ⅖ in drosophila produces:

NUMS 2020
Biology
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The gene which controls ABO group has how many alleles in an individual

Which of the following X – linked recessive trait that is more common in human males than in human females?

NUMS 2019 Cancelled
Biology
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A pea plant has purple colored flowers (dominant trait). To check the genotype, which of the following cross is performed

NUMS 2018
Biology
Variation and Genetics
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In nature, Garden pea is

If we cross round (RR) seeded plants with wrinkled (rr) seed plant, and get F1 round seeded. In F2 generation, what will be genotypic ration of plants try Punnett square method?

NUMS 2019 Cancelled
Biology
Variation and Genetics
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A pure breeding plant with the dominant phenotype of character P and the recessive phenotype of character Q was crossed with another pure breeding plant with the recessive phenotype of chracter P and the dominant phenotype of Q. The offspring of this cross were crossed with a double homozygous recessive for P and Q and the following results were obtained:

22 were phenotypically dominant for P and recessive for Q
5 were phenotypically dominant for both P and Q
4 were phenotypically recessive for both P and Q
24 were phenotypically recessive for P and dominant for Q
Which one of the following types of Inheritance is illustrated by these results?

Biology
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NTS 2013
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A pure breeding tall pea plant was crossed to dwarf plant what will be the frequency of dwarf plants in F1

If the seed is heterozygous yellow (Yy). In a test cross, what will be the probability of appearance of seed colors?

NUMS 2019 Reconduct
Biology
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How many pairs of homologous chromosomes are present in Pisum sativum

A cross between F1 hybrids and either of parents is called:

NUMS 2014
Biology
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The genes which do not follow law of independent assortment

A man with blood group “A” marries a woman of blood group “B”. Both are heterozygous. What is the off-springs having phenotype “O”

In cats, the genes controlling coat-color are co-dominant (incompletely dominant) and are carried on the X chromosomes. When a black female was mated with a ginger male the resulting litter consisted of black male and tortoise-shell female kittens. What phenotypic ratio would be expected in the F2 generation?

NTS 2012
Biology
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Which of the following is monohybrid cross

The total number of genes present in a particular population, at a particular time is called:

NUMS 2019 Cancelled
Biology
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Baldness is most frequent in

In birds the male is the homogametic sex. A male bird showing the recessive trait was mated with a female showing the dominant trait of a characteristic governed by a pair of alleles which are sex-linked. What is the probability that the male offspring will show the dominant trait?

NTS 2014
Biology
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In question number 2 what will be frequency of dwarf plant in F2

What CANNOT be true for a man having B+ve blood group?

NUMS 2019 Reconduct
Biology
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Ahmed’s blood CANNOT clot properly; he was diagnosed with hemophilia A. He passed this trait to his grandson through his:

NUMS 2019 Reconduct
Biology
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A trait whose alleles are present in both males and females but prominent more in one sex than other is a:

NUMS 2016
Biology
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Read the passage below to answer the question:

Hemophilia is a disorder in which blood fails to clot. Saad, a male hemophiliac, marries Sara, a normal woman and together they have four children, two boys (Ahmed and Ali) and two girls (Alia and Ayesha). None of the children display the symptoms of Hemophilia. Ahmed, Ali, Ayesha, and Ali all marry normal individuals and have children. None of Ahmeds or Ali’s children, male or female, display symptoms of hemophilia, but the sons of Alia and Ayesha display symptoms of hemophilia while the daughters of Alia and Ayesha do not.

If one of Ali’s daughters marries a normal man,what is the probability that one of their children will display symptoms of hemophilia:

NTS 2010
Biology
Variation and Genetics
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Read the passage below to answer the question:

Hemophilia is a disorder in which blood fails to clot. Saad, a male hemophiliac, marries Sara, a normal woman and together they have four children, two boys (Ahmed and Ali) and two girls (Alia and Ayesha). None of the children display the symptoms of Hemophilia. Ahmed, Ali, Ayesha, and Ali all marry normal individuals and have children. None of Ahmeds or Ali’s children, male or female, display symptoms of hemophilia, but the sons of Alia and Ayesha display symptoms of hemophilia while the daughters of Alia and Ayesha do not.

Which of the following individuals are heterozygous for hemophilia:

NTS 2010
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In ‘Complete Dominance’:

PMC 2020
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Mendel concluded that each organism has two hereditary factors for each trait, now called:

NTS 2015 SMBBMC
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In which of the following cases, genotypic and phenotypic ratio will remain same in F2 generation

J. Seiler in 1914 discovered which type of sex determination in moths?

NUMS 2015
Biology
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Continuous variations in a population were first observed by:

NUMS 2015
Biology
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Which traits are most likely to affect men than women?

PMC 2020
Biology
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What is the risk of color blind baby boy in a family when mother is color blind but father is normal?

NUMS 2019 Cancelled
Biology
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Phenotype for both TT and Tt is tall, so the allele T is known as:

NUMS 2019 Cancelled
Biology
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In the pea plants, the factors round and yellow seeds (RRYY) is dominant over wrinkled and green seeds (rryy). Keeping this in mind, identify the seed that has the genotype round and green.

NTS 2011
Biology
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Which of the following characters of pea plant is dominant?

Hybrid black Guinea pigs are crossed with each other. The resulting offsprings will be:

NUMS 2016
Biology
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The position of a gene on chromosome is called

The trait “Kernel colour in corn” in controlled by how many pairs of genes

A child with AB blood group who was born to a mother of the genotype IAIA cannot have the father of the genotype:

NUMS 2014
Biology
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A pure breeding tall plant was crossed to dwarf plant. What would be probability of “Tt” genotype in F2

______ alleles both have an effect on the phenotype of a heterozygous organism:

PMC 2020
Biology
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How many genes control Rh blood group system?

An Rh negative woman is married to an Rh positive man whose father was also Rh negative. What are the chances that their child will be affected?

NTS 2016 SMBBMC
Biology
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