Mating of an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called
(1) reciprocal cross
(2) test cross
(3) dihybrid cross
(4) back cross
Which of the following is correct ?
(1) Henking discovered the small Y-chromosome.
(2) Drosophila also shows XX-XY sex determination like human.
(3) Birds have ZZ-ZW sex determination, where females are ZZ and males are ZW.
(4) Grasshoppers show XX-XY sex determination.
Which of the following occurs due to monosomy of sex chromosome?
1. Down's syndrome
2. Turner's syndrome
3. Haemophilia
4. Sickle cell anaemia
If 'A' represents the dominant gene and 'a' represents its recessive allele, which of the following would be the most likely result in the first generation offspring when Aa is crossed with aa ?
1. All will exhibit dominant phenotype.
2. All will exhibit recessive phenotype.
3. Dominant and recessive phenotypes will be 50% each.
4. Dominant phenotype will be 75%.
In a plant, red fruit (R) dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTT genotype is crossed with a plant that is rrtt. Then
(1) 25% will be tall with red fruit
(2) 50% will be tall with red fruit
(3) 75% will be tall with red fruit
(4) All of the offspring will be tall with red fruits
A pea plant parent having violet-coloured flowers with unknown genotype was crossed with a plant having white-coloured flowers. In the progeny, 50% were white. The genotypic constitution of the parent having violet-coloured flowers was
1. homozygous
2. merozygous
3. heterozygous
4. hemizygous
In two pea plants having red (dominant) coloured flowers with unknown genotypes are crossed, 75% of the flowers are red and 25% are white. The genotypic constitution of the parents having red coloured flowers will be
(1) both homozygous
(2) one homozygous and other heterozygous
(3) both heterozygous
(4) both hemizygous
How many pairs of contrasting traits studied by Mendel were related to pod?
(1) 1
(2) 2
(3) 3
(4) 4
Among the given pea plant traits identify the odd one
(1) Violet flower
(2) Yellow seed
(3) Yellow pod
(4) Axial flower position
Which of the following does not contribute to Mendel’s success?
(1) Large sampling size
(2) Statistical analysis
(3) Performed experiments on single variety of pea
(4) Performed experiments on successive generations