The offspring produced by outbreeding (cross between unrelated population) are found to be more superior than either of the parent. This superiority of the hybrid is known as:
Which one of the following characters in humans is not a autosomal recessive character?
Which one of the following is not a sex-linked recessive character in humans?
Sex-determination in Dorsophila is governed by:
In turner's syndrome, the phenotypic female has XO-genotype possesses:
In honey bee, the sex ratio of the offspring remains under the control of:
Haemophilia is caused by a sex-linked recessive gene located in the:
In a case of gynandromorphism:
In alleles for tallness by represented by 'T' and the allele for dwarfness by't', what will be the height of the offsprings (tall and dwarf) from crosses between Tt × tt, TT × Tt and Tt × Tt respectively?
In cattle, hornless condition (P) is dominant over horned (p). A certain bull is bred to three cows. With cow A which is horned, a hornless calf is produced; with cow B a horned calf is produced; with cow C which is hornless, a horned calf is produced. What are the genotype of cows A, B, C and the bull?
Two sets of parents, Mr X and Mrs X, Mr Y and Mrs Y are claiming the same baby. Blood tests give information that Mr X And Mrs X belong to A group of blood and Mr Y belongs to O group while Mrs Y is of AB group. The child belongs to 'O'. To which parents should the child go?
The enzyme which can break and release one strand of DNA is:
In rabbit black skin is dominant over brown skin and short hair is dominant over long hair. If homozygous black-short haired male is crossed with a homozygous brown-long haired female, the phenotype of F2 offspring will be in the ratio of:
A woman has a rare abnormality of eyelids called ptosis which depends on a single dominant gene (P). The woman's father had ptosis but her mother had normal eyelids. What are the probable genotypes of the woman, her mother and father respectively?
If a woman with normal colour vision and having married to a normal colour vision man and colour-blind father gives birth to children, then:
A man with blood group A has a wife with blood group B. They have a child with blood group O. The other blood groups that can be expected in the future offspring of his couple are:
A haemophilic man marries a normal homozygous woman. What is the probability of their son and daughters being haemophilic respectively:
In the nucleus of resting cell of an XO female, there is:
During mutagenesis, the information necessary to repair the damaged segment of the DNA is present in:
Erythroblastosis foetails can occur when:
Human male who carries a sex-linked gene on the X-chromosome will transmit that gene to:
A pair of contrasting characters is termed as:
The ability of chemicals to induce mutation was first of all demonstrated by:
In auto fertilization, ______________ fuses with the egg nucleus:
The genes which exclusively occur in Y-chromosomes are called: