Free Principles Of Inheritance And Variation (Daily Quiz: 7) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Answer: (a)

All alleles of a gene are situated on the same loci of chromosomes in organisms.

Answer: (a)

A dominant epistatic allele suppresses the expression of a non-allelic gene whether the latter is dominant or recessive. The gene which suppresses the expression of a non-allelic gene is known as epistatic gene. The gene or locus which is suppressed by the presence of non-allelic gene is termed as hypostatic gene. In summer squash or Cucurbita pepo, there are three types of fruit colour— yellow, green and white. White colour is dominant over other colours while yellow is dominant over green. Yellow colour is formed only when the dominant epistatic gene is represented by its recessive allele (w). When the hypostatic gene is also recessive (y), the colour of the fruit is green, i.e.,

W – Yy, W – yy → White

wwY → Yellow

wwyy → Green

Answer: (b)

A point mutation is a simple change in one base of the gene sequence. This is equivalent to changing one letterin a sentence, such as this example, where we change the‘c’ in cat to an ‘h’:

Original: The fat cat ate the wee rat.

Point Mutation: The fat hat ate the wee rat.

Answer: (d)

So, the corresponding genotype will be AaBb.