Question

Consider a gene with two alleles that show complete dominance. When a homozygous recessive individual (qq) is crossed with a heterozygous individual (Qq), they have a 50 percent chance of producing a homozygous recessive offspring. The next time these two individuals breed, what are the chances that they will once again have a homozygous recessive progeny?

Answer 1

There will be
`50`% chances of occurrence of a homozygous recessive progeny

Step-by-step explanation:

Complete dominance is a situation in which the trait which is considered as dominant overshadow the trait represented by recessive allele.

Hence Q will always over dominate q

Thus, when next time a cross is carried out between homozygous recessive individual (qq) and heterozygous individual (Qq), the following offspring will be produced-

q q

Q Qq Qq

q qq qq

Thus, as we can see out of four offspring , two have homozygous recessive progeny i.e qq

Hence, the chances of occurence of a homozygous recessive progeny again is equal to

`(2)/(4) * 100\\= 50`%